chore: switch from MSTest to NUnit (#76)

X10D.Tests/X10D.Tests.csproj

@@ -15,15 +15,13 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Microsoft.Extensions.Hosting" Version="7.0.0"/>
+        <PackageReference Include="Microsoft.Extensions.Hosting" Version="7.0.1"/>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0"/>
         <PackageReference Include="Moq" Version="4.18.4"/>
-        <PackageReference Include="MSTest.TestAdapter" Version="3.0.2"/>
-        <PackageReference Include="MSTest.TestFramework" Version="3.0.2"/>
-        <PackageReference Include="coverlet.collector" Version="3.2.0">
-            <PrivateAssets>all</PrivateAssets>
-            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
-        </PackageReference>
+        <PackageReference Include="NUnit" Version="3.13.3"/>
+        <PackageReference Include="NUnit3TestAdapter" Version="4.4.2"/>
+        <PackageReference Include="NUnit.Analyzers" Version="3.6.1"/>
+        <PackageReference Include="coverlet.collector" Version="3.2.0"/>
     </ItemGroup>
 
     <ItemGroup>

X10D.Tests/src/Collections/ArrayTests.AsReadOnly.cs

@@ -1,42 +1,42 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
 public partial class ArrayTests
 {
-    [TestClass]
+    [TestFixture]
     public class AsReadOnlyTests
     {
-        [TestMethod]
+        [Test]
         public void AsReadOnly_ShouldReturnReadOnlyCollection_WhenArrayIsNotNull()
         {
             int[] array = {1, 2, 3};
             IReadOnlyCollection<int> result = array.AsReadOnly();
-            Assert.IsInstanceOfType(result, typeof(IReadOnlyCollection<int>));
+            Assert.That(result, Is.InstanceOf<IReadOnlyCollection<int>>());
         }
 
-        [TestMethod]
+        [Test]
         public void AsReadOnly_ShouldThrowArgumentNullException_WhenArrayIsNull()
         {
-            int[]? array = null;
-            Assert.ThrowsException<ArgumentNullException>(() => array!.AsReadOnly());
+            int[] array = null!;
+            Assert.Throws<ArgumentNullException>(() => _ = array.AsReadOnly());
         }
 
-        [TestMethod]
+        [Test]
         public void AsReadOnly_ShouldReturnCorrectCount_WhenArrayIsNotEmpty()
         {
             int[] array = {1, 2, 3};
             IReadOnlyCollection<int> result = array.AsReadOnly();
-            Assert.AreEqual(array.Length, result.Count);
+            Assert.That(result, Has.Count.EqualTo(array.Length));
         }
 
-        [TestMethod]
+        [Test]
         public void AsReadOnly_ShouldReturnEmptyCollection_WhenArrayIsEmpty()
         {
             int[] array = Array.Empty<int>();
             IReadOnlyCollection<int> result = array.AsReadOnly();
-            Assert.AreEqual(0, result.Count);
+            Assert.That(result, Is.Empty);
         }
     }
 }

X10D.Tests/src/Collections/ArrayTests.Clear.cs

@@ -1,63 +1,63 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
 public partial class ArrayTests
 {
-    [TestClass]
+    [TestFixture]
     public class ClearTests
     {
-        [TestMethod]
+        [Test]
         public void Clear_ShouldClearTheArray()
         {
             var array = new int?[] {1, 2, 3, null, 4};
 
             array.Clear();
 
-            Assert.IsTrue(array.All(x => x == null));
+            Assert.That(array.All(x => x == null));
         }
 
-        [TestMethod]
+        [Test]
         public void Clear_ShouldDoNothing_WhenArrayIsEmpty()
         {
             int[] array = Array.Empty<int>();
             array.Clear();
         }
 
-        [TestMethod]
+        [Test]
         public void Clear_WithRange_ShouldClearTheSpecifiedRangeOfTheArray()
         {
             var array = new int?[] {1, 2, 3, null, 4};
 
             array.Clear(1..4);
 
-            Assert.AreEqual(5, array.Length);
-            Assert.AreEqual(1, array[0]);
-            Assert.AreEqual(4, array[4]);
-            Assert.IsTrue(array[1..4].All(x => x == null));
+            Assert.That(array.Length, Is.EqualTo(5));
+            Assert.That(array[0], Is.EqualTo(1));
+            Assert.That(array[4], Is.EqualTo(4));
+            Assert.That(array[1..4].All(x => x == null));
         }
 
-        [TestMethod]
+        [Test]
         public void Clear_WithIndexAndLength_ShouldClearTheSpecifiedRangeOfTheArray()
         {
             var array = new int?[] {1, 2, 3, null, 4};
 
             array.Clear(1, 3);
 
-            Assert.AreEqual(5, array.Length);
-            Assert.AreEqual(1, array[0]);
-            Assert.AreEqual(4, array[4]);
-            Assert.IsTrue(array[1..4].All(x => x == null));
+            Assert.That(array.Length, Is.EqualTo(5));
+            Assert.That(array[0], Is.EqualTo(1));
+            Assert.That(array[4], Is.EqualTo(4));
+            Assert.That(array[1..4].All(x => x == null));
         }
 
-        [TestMethod]
+        [Test]
         public void Clear_ShouldThrowArgumentNullException_WhenArrayIsNull()
         {
             int[] array = null!;
-            Assert.ThrowsException<ArgumentNullException>(() => array.Clear());
-            Assert.ThrowsException<ArgumentNullException>(() => array.Clear(0, 1));
-            Assert.ThrowsException<ArgumentNullException>(() => array.Clear(..1));
+            Assert.Throws<ArgumentNullException>(() => array.Clear());
+            Assert.Throws<ArgumentNullException>(() => array.Clear(0, 1));
+            Assert.Throws<ArgumentNullException>(() => array.Clear(..1));
         }
     }
 }

X10D.Tests/src/Collections/ArrayTests.cs

@@ -1,8 +1,8 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
+[TestFixture]
 public partial class ArrayTests
 {
 }

X10D.Tests/src/Collections/BoolListTests.cs

@@ -1,56 +1,56 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
+[TestFixture]
 public class BoolListTests
 {
-    [TestMethod]
+    [Test]
     public void PackByte_Should_Pack_Correctly()
     {
         var array = new[] {true, false, true, false, true, false, true, false};
-        Assert.AreEqual(85, array.PackByte()); // 01010101
+        Assert.That(array.PackByte(), Is.EqualTo(85)); // 01010101
     }
 
-    [TestMethod]
+    [Test]
     public void Pack16Bit_Should_Pack_Correctly()
     {
         var array = new[] {true, false, true, false, true, false, true, false, true, true, false, true};
-        Assert.AreEqual(2901, array.PackInt16()); // 101101010101
+        Assert.That(array.PackInt16(), Is.EqualTo(2901)); // 101101010101
     }
 
-    [TestMethod]
+    [Test]
     public void Pack32Bit_Should_Pack_Correctly()
     {
         var array = new[] {true, false, true, false, true, false, true, false, true, true, false, true};
-        Assert.AreEqual(2901, array.PackInt32()); // 101101010101
+        Assert.That(array.PackInt32(), Is.EqualTo(2901)); // 101101010101
     }
 
-    [TestMethod]
+    [Test]
     public void Pack64Bit_Should_Pack_Correctly()
     {
         var array = new[] {true, false, true, false, true, false, true, false, true, true, false, true};
-        Assert.AreEqual(2901, array.PackInt64()); // 101101010101
+        Assert.That(array.PackInt64(), Is.EqualTo(2901)); // 101101010101
     }
 
-    [TestMethod]
+    [Test]
     public void Pack_ShouldThrow_GivenLargeArray()
     {
         bool[] array = Enumerable.Repeat(false, 65).ToArray();
-        Assert.ThrowsException<ArgumentException>(() => array.PackByte());
-        Assert.ThrowsException<ArgumentException>(() => array.PackInt16());
-        Assert.ThrowsException<ArgumentException>(() => array.PackInt32());
-        Assert.ThrowsException<ArgumentException>(() => array.PackInt64());
+        Assert.Throws<ArgumentException>(() => _ = array.PackByte());
+        Assert.Throws<ArgumentException>(() => _ = array.PackInt16());
+        Assert.Throws<ArgumentException>(() => _ = array.PackInt32());
+        Assert.Throws<ArgumentException>(() => _ = array.PackInt64());
     }
 
-    [TestMethod]
+    [Test]
     public void Pack_ShouldThrow_GivenNull()
     {
-        bool[]? array = null;
-        Assert.ThrowsException<ArgumentNullException>(() => array!.PackByte());
-        Assert.ThrowsException<ArgumentNullException>(() => array!.PackInt16());
-        Assert.ThrowsException<ArgumentNullException>(() => array!.PackInt32());
-        Assert.ThrowsException<ArgumentNullException>(() => array!.PackInt64());
+        bool[] array = null!;
+        Assert.Throws<ArgumentNullException>(() => _ = array.PackByte());
+        Assert.Throws<ArgumentNullException>(() => _ = array.PackInt16());
+        Assert.Throws<ArgumentNullException>(() => _ = array.PackInt32());
+        Assert.Throws<ArgumentNullException>(() => _ = array.PackInt64());
     }
 }

X10D.Tests/src/Collections/ByteTests.cs

@@ -1,67 +1,74 @@
 using System.Runtime.Intrinsics.X86;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
+[TestFixture]
 public class ByteTests
 {
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldUnpackToArrayCorrectly()
     {
         const byte value = 0b11010100;
         bool[] bits = value.Unpack();
 
-        Assert.AreEqual(8, bits.Length);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
+        Assert.That(bits, Has.Length.EqualTo(8));
+        Assert.Multiple(() =>
+        {
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldUnpackToSpanCorrectly()
     {
         const byte value = 0b11010100;
-        Span<bool> bits = stackalloc bool[8];
-        value.Unpack(bits);
+        Assert.Multiple(() =>
+        {
+            Span<bool> bits = stackalloc bool[8];
+            value.Unpack(bits);
 
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+        });
     }
 
 #if NET5_0_OR_GREATER
-
-    [TestMethod]
+    [Test]
     public void UnpackInternal_Fallback_ShouldUnpackToSpanCorrectly()
     {
         const byte value = 0b11010100;
-        Span<bool> bits = stackalloc bool[8];
-        value.UnpackInternal_Fallback(bits);
+        Assert.Multiple(() =>
+        {
+            Span<bool> bits = stackalloc bool[8];
+            value.Unpack(bits);
 
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void UnpackInternal_Ssse3_ShouldUnpackToSpanCorrectly()
     {
         if (!Sse3.IsSupported)
@@ -70,31 +77,34 @@ public class ByteTests
         }
 
         const byte value = 0b11010100;
-        Span<bool> bits = stackalloc bool[8];
-        value.UnpackInternal_Ssse3(bits);
+        Assert.Multiple(() =>
+        {
+            Span<bool> bits = stackalloc bool[8];
+            value.Unpack(bits);
 
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+        });
     }
 #endif
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldRepackEqually()
     {
         const byte value = 0b11010100;
-        Assert.AreEqual(value, value.Unpack().PackByte());
+        Assert.That(value.Unpack().PackByte(), Is.EqualTo(value));
     }
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldThrow_GivenTooSmallSpan()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             const byte value = 0b11010100;
             Span<bool> bits = stackalloc bool[0];

X10D.Tests/src/Collections/CollectionTests.ClearAndDisposeAll.cs

@@ -1,16 +1,16 @@
 using System.Collections.ObjectModel;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Moq;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
 public partial class CollectionTests
 {
-    [TestClass]
+    [TestFixture]
     public class ClearAndDisposeAllTests
     {
-        [TestMethod]
+        [Test]
         public void ClearAndDisposeAll_ShouldClearAndDisposeAllItems_WhenCalledWithValidList()
         {
             var mock1 = new Mock<IDisposable>();
@@ -23,23 +23,23 @@ public partial class CollectionTests
             mock1.Verify(i => i.Dispose(), Times.Once);
             mock2.Verify(i => i.Dispose(), Times.Once);
             mock3.Verify(i => i.Dispose(), Times.Once);
-            Assert.AreEqual(0, list.Count);
+            Assert.That(list, Is.Empty);
         }
 
-        [TestMethod]
+        [Test]
         public void ClearAndDisposeAll_ShouldThrowArgumentNullException_WhenCalledWithNullList()
         {
             List<IDisposable>? list = null;
-            Assert.ThrowsException<ArgumentNullException>(() => list!.ClearAndDisposeAll());
+            Assert.Throws<ArgumentNullException>(() => list!.ClearAndDisposeAll());
         }
 
-        [TestMethod]
+        [Test]
         public void ClearAndDisposeAll_ShouldThrowInvalidOperationException_WhenCalledWithReadOnlyList()
         {
             var mock = new Mock<IDisposable>();
             var list = new ReadOnlyCollection<IDisposable>(new List<IDisposable> {mock.Object});
 
-            Assert.ThrowsException<InvalidOperationException>(() => list.ClearAndDisposeAll());
+            Assert.Throws<InvalidOperationException>(() => list.ClearAndDisposeAll());
         }
     }
 }

X10D.Tests/src/Collections/CollectionTests.ClearAndDisposeAllAsync.cs

@@ -1,16 +1,16 @@
 using System.Collections.ObjectModel;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Moq;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
 public partial class CollectionTests
 {
-    [TestClass]
+    [TestFixture]
     public class ClearAndDisposeAllAsyncTests
     {
-        [TestMethod]
+        [Test]
         public async Task ClearAndDisposeAllAsync_ShouldClearAndDisposeAllItems_WhenCalledWithValidList()
         {
             var mock1 = new Mock<IAsyncDisposable>();
@@ -23,23 +23,23 @@ public partial class CollectionTests
             mock1.Verify(i => i.DisposeAsync(), Times.Once);
             mock2.Verify(i => i.DisposeAsync(), Times.Once);
             mock3.Verify(i => i.DisposeAsync(), Times.Once);
-            Assert.AreEqual(0, list.Count);
+            Assert.That(list, Is.Empty);
         }
 
-        [TestMethod]
-        public async Task ClearAndDisposeAllAsync_ShouldThrowArgumentNullException_WhenCalledWithNullList()
+        [Test]
+        public void ClearAndDisposeAllAsync_ShouldThrowArgumentNullException_WhenCalledWithNullList()
         {
             List<IAsyncDisposable>? list = null;
-            await Assert.ThrowsExceptionAsync<ArgumentNullException>(list!.ClearAndDisposeAllAsync).ConfigureAwait(false);
+            Assert.ThrowsAsync<ArgumentNullException>(list!.ClearAndDisposeAllAsync);
         }
 
-        [TestMethod]
-        public async Task ClearAndDisposeAllAsync_ShouldThrowInvalidOperationException_WhenCalledWithReadOnlyList()
+        [Test]
+        public void ClearAndDisposeAllAsync_ShouldThrowInvalidOperationException_WhenCalledWithReadOnlyList()
         {
             var mock = new Mock<IAsyncDisposable>();
             var list = new ReadOnlyCollection<IAsyncDisposable>(new List<IAsyncDisposable> {mock.Object});
 
-            await Assert.ThrowsExceptionAsync<InvalidOperationException>(list.ClearAndDisposeAllAsync).ConfigureAwait(false);
+            Assert.ThrowsAsync<InvalidOperationException>(list.ClearAndDisposeAllAsync);
         }
     }
 }

X10D.Tests/src/Collections/CollectionTests.cs

@@ -1,8 +1,8 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
+[TestFixture]
 public partial class CollectionTests
 {
 }

X10D.Tests/src/Collections/DictionaryTests.cs

@@ -1,176 +1,231 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
+[TestFixture]
 public class DictionaryTests
 {
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldAddNewKey_IfNotExists_GivenConcreteDictionary()
     {
         var dictionary = new Dictionary<int, string>();
-        Assert.IsFalse(dictionary.ContainsKey(1));
+        Assert.That(dictionary.ContainsKey(1), Is.False);
 
         dictionary.AddOrUpdate(1, "one", (_, _) => string.Empty);
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("one", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("one"));
+        });
 
         dictionary.Clear();
-        Assert.IsFalse(dictionary.ContainsKey(1));
+        Assert.That(dictionary.ContainsKey(1), Is.False);
 
         dictionary.AddOrUpdate(1, _ => "one", (_, _) => string.Empty);
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("one", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("one"));
+        });
 
         dictionary.Clear();
-        Assert.IsFalse(dictionary.ContainsKey(1));
+        Assert.That(dictionary, Is.Empty);
+        Assert.That(dictionary.ContainsKey(1), Is.False);
 
         dictionary.AddOrUpdate(1, (_, _) => "one", (_, _, _) => string.Empty, 0);
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("one", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1), Is.True);
+            Assert.That(dictionary[1], Is.EqualTo("one"));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldAddNewKey_IfNotExists_GivenIDictionary()
     {
         IDictionary<int, string> dictionary = new Dictionary<int, string>();
-        Assert.IsFalse(dictionary.ContainsKey(1));
+        Assert.That(dictionary.ContainsKey(1), Is.False);
 
         dictionary.AddOrUpdate(1, "one", (_, _) => string.Empty);
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("one", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1), Is.True);
+            Assert.That(dictionary[1], Is.EqualTo("one"));
+        });
 
         dictionary.Clear();
-        Assert.IsFalse(dictionary.ContainsKey(1));
+        Assert.That(dictionary.ContainsKey(1), Is.False);
 
         dictionary.AddOrUpdate(1, _ => "one", (_, _) => string.Empty);
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("one", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1), Is.True);
+            Assert.That(dictionary[1], Is.EqualTo("one"));
+        });
 
         dictionary.Clear();
-        Assert.IsFalse(dictionary.ContainsKey(1));
+        Assert.That(dictionary, Is.Empty);
+        Assert.That(dictionary.ContainsKey(1), Is.False);
 
         dictionary.AddOrUpdate(1, (_, _) => "one", (_, _, _) => string.Empty, 0);
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("one", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1), Is.True);
+            Assert.That(dictionary[1], Is.EqualTo("one"));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldUpdateKey_IfExists_GivenConcreteDirection()
     {
         var dictionary = new Dictionary<int, string> {[1] = "one"};
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("one", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("one"));
+        });
 
         dictionary.AddOrUpdate(1, string.Empty, (_, _) => "two");
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("two", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("two"));
+        });
 
         dictionary.Clear();
-        Assert.IsFalse(dictionary.ContainsKey(1));
+        Assert.That(dictionary, Is.Empty);
+        Assert.That(dictionary.ContainsKey(1), Is.False);
+
         dictionary[1] = "one";
-
         dictionary.AddOrUpdate(1, _ => string.Empty, (_, _) => "two");
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("two", dictionary[1]);
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("two"));
+        });
 
         dictionary.Clear();
-        Assert.IsFalse(dictionary.ContainsKey(1));
+        Assert.That(dictionary, Is.Empty);
+        Assert.That(dictionary.ContainsKey(1), Is.False);
         dictionary[1] = "one";
 
         dictionary.AddOrUpdate(1, (_, _) => string.Empty, (_, _, _) => "two", 0);
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("two", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("two"));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldUpdateKey_IfExists_GivenIDictionary()
     {
         IDictionary<int, string> dictionary = new Dictionary<int, string> {[1] = "one"};
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("one", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("one"));
+        });
 
         dictionary.AddOrUpdate(1, string.Empty, (_, _) => "two");
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("two", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("two"));
+        });
 
         dictionary.Clear();
-        Assert.IsFalse(dictionary.ContainsKey(1));
-        dictionary[1] = "one";
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary, Is.Empty);
+            Assert.That(dictionary.ContainsKey(1), Is.False);
+        });
 
+        dictionary[1] = "one";
         dictionary.AddOrUpdate(1, _ => string.Empty, (_, _) => "two");
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("two", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("two"));
+        });
 
         dictionary.Clear();
-        Assert.IsFalse(dictionary.ContainsKey(1));
-        dictionary[1] = "one";
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary, Is.Empty);
+            Assert.That(dictionary.ContainsKey(1), Is.False);
+            dictionary[1] = "one";
+        });
 
         dictionary.AddOrUpdate(1, (_, _) => string.Empty, (_, _, _) => "two", 0);
-        Assert.IsTrue(dictionary.ContainsKey(1));
-        Assert.AreEqual("two", dictionary[1]);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dictionary.ContainsKey(1));
+            Assert.That(dictionary[1], Is.EqualTo("two"));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldThrow_GivenNullDictionary_GivenConcreteDictionary()
     {
         Dictionary<int, string>? dictionary = null;
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary!.AddOrUpdate(1, string.Empty, (_, _) => string.Empty));
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() => dictionary!.AddOrUpdate(1, string.Empty, (_, _) => string.Empty));
+        Assert.Throws<ArgumentNullException>(() =>
             dictionary!.AddOrUpdate(1, _ => string.Empty, (_, _) => string.Empty));
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() =>
             dictionary!.AddOrUpdate(1, (_, _) => string.Empty, (_, _, _) => string.Empty, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldThrow_GivenNullDictionary_GivenIDictionary()
     {
         IDictionary<int, string>? dictionary = null;
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary!.AddOrUpdate(1, string.Empty, (_, _) => string.Empty));
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() => dictionary!.AddOrUpdate(1, string.Empty, (_, _) => string.Empty));
+        Assert.Throws<ArgumentNullException>(() =>
             dictionary!.AddOrUpdate(1, _ => string.Empty, (_, _) => string.Empty));
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() =>
             dictionary!.AddOrUpdate(1, (_, _) => string.Empty, (_, _, _) => string.Empty, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldThrow_GivenNullUpdateValueFactory_GivenConcreteDictionary()
     {
         var dictionary = new Dictionary<int, string>();
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, string.Empty, null!));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, _ => string.Empty, null!));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, (_, _) => string.Empty, null!, 0));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, string.Empty, null!));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, _ => string.Empty, null!));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, (_, _) => string.Empty, null!, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldThrow_GivenNullUpdateValueFactory_GivenIDictionary()
     {
         IDictionary<int, string> dictionary = new Dictionary<int, string>();
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, string.Empty, null!));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, _ => string.Empty, null!));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, (_, _) => string.Empty, null!, 0));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, string.Empty, null!));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, _ => string.Empty, null!));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, (_, _) => string.Empty, null!, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldThrow_GivenNullAddValueFactory_GivenConcreteDictionary()
     {
         var dictionary = new Dictionary<int, string>();
         Func<int, string>? addValueFactory = null;
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, addValueFactory!, (_, _) => "one"));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, null!, (_, _, _) => "one", 0));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, addValueFactory!, (_, _) => "one"));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, null!, (_, _, _) => "one", 0));
     }
 
-    [TestMethod]
+    [Test]
     public void AddOrUpdate_ShouldThrow_GivenNullAddValueFactory_GivenIDictionary()
     {
         IDictionary<int, string> dictionary = new Dictionary<int, string>();
         Func<int, string>? addValueFactory = null;
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, addValueFactory!, (_, _) => "one"));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.AddOrUpdate(1, null!, (_, _, _) => "one", 0));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, addValueFactory!, (_, _) => "one"));
+        Assert.Throws<ArgumentNullException>(() => dictionary.AddOrUpdate(1, null!, (_, _, _) => "one", 0));
     }
 
-    [TestMethod]
+    [Test]
     public void ToConnectionString_ShouldReturnConnectionString()
     {
         var dictionary = new Dictionary<string, string?>
@@ -179,10 +234,10 @@ public class DictionaryTests
         };
 
         string connectionString = dictionary.ToConnectionString();
-        Assert.AreEqual("Data Source=localhost;Initial Catalog=test;Integrated Security=True;Foobar=", connectionString);
+        Assert.That(connectionString, Is.EqualTo("Data Source=localhost;Initial Catalog=test;Integrated Security=True;Foobar="));
     }
 
-    [TestMethod]
+    [Test]
     public void ToConnectionString_ShouldReturnTransformedValueConnectionString()
     {
         var dictionary = new Dictionary<string, string?>
@@ -191,10 +246,10 @@ public class DictionaryTests
         };
 
         string connectionString = dictionary.ToConnectionString(v => v?.ToUpperInvariant());
-        Assert.AreEqual("Data Source=LOCALHOST;Initial Catalog=TEST;Integrated Security=TRUE;Foobar=", connectionString);
+        Assert.That(connectionString, Is.EqualTo("Data Source=LOCALHOST;Initial Catalog=TEST;Integrated Security=TRUE;Foobar="));
     }
 
-    [TestMethod]
+    [Test]
     public void ToConnectionString_ShouldReturnTransformedKeyValueConnectionString()
     {
         var dictionary = new Dictionary<string, string?>
@@ -203,69 +258,69 @@ public class DictionaryTests
         };
 
         string connectionString = dictionary.ToConnectionString(k => k.ToUpper(), v => v?.ToUpperInvariant());
-        Assert.AreEqual("DATA SOURCE=LOCALHOST;INITIAL CATALOG=TEST;INTEGRATED SECURITY=TRUE;FOOBAR=", connectionString);
+        Assert.That(connectionString, Is.EqualTo("DATA SOURCE=LOCALHOST;INITIAL CATALOG=TEST;INTEGRATED SECURITY=TRUE;FOOBAR="));
     }
 
-    [TestMethod]
+    [Test]
     public void ToConnectionString_ShouldThrow_GivenNullSource()
     {
-        Dictionary<string, string>? dictionary = null;
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary!.ToConnectionString());
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary!.ToConnectionString(null!));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary!.ToConnectionString(null!, null!));
+        Dictionary<string, string> dictionary = null!;
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToConnectionString());
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToConnectionString(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToConnectionString(null!, null!));
     }
 
-    [TestMethod]
+    [Test]
     public void ToConnectionString_ShouldThrow_GivenNullSelector()
     {
         var dictionary = new Dictionary<string, string>();
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.ToConnectionString(null!));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.ToConnectionString(null!, _ => _));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.ToConnectionString(_ => _, null!));
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToConnectionString(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToConnectionString(null!, _ => _));
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToConnectionString(_ => _, null!));
     }
 
-    [TestMethod]
+    [Test]
     public void ToGetParameters_ShouldReturnParameters()
     {
         var dictionary = new Dictionary<string, string> {["id"] = "1", ["user"] = "hello world", ["foo"] = "bar"};
 
         string queryString = dictionary.ToGetParameters();
-        Assert.AreEqual("id=1&user=hello+world&foo=bar", queryString);
+        Assert.That(queryString, Is.EqualTo("id=1&user=hello+world&foo=bar"));
     }
 
-    [TestMethod]
+    [Test]
     public void ToGetParameters_ShouldReturnTransformedValueParameters()
     {
         var dictionary = new Dictionary<string, string?> {["id"] = "1", ["user"] = "hello world", ["foo"] = null};
 
         string queryString = dictionary.ToGetParameters(v => v?.ToUpper());
-        Assert.AreEqual("id=1&user=HELLO+WORLD&foo=", queryString);
+        Assert.That(queryString, Is.EqualTo("id=1&user=HELLO+WORLD&foo="));
     }
 
-    [TestMethod]
+    [Test]
     public void ToGetParameters_ShouldReturnTransformedKeyValueParameters()
     {
         var dictionary = new Dictionary<string, string?> {["id"] = "1", ["user"] = "hello world", ["foo"] = null};
 
         string queryString = dictionary.ToGetParameters(k => k.ToUpper(), v => v?.ToUpper());
-        Assert.AreEqual("ID=1&USER=HELLO+WORLD&FOO=", queryString);
+        Assert.That(queryString, Is.EqualTo("ID=1&USER=HELLO+WORLD&FOO="));
     }
 
-    [TestMethod]
+    [Test]
     public void ToGetParameters_ShouldThrow_GivenNullSource()
     {
-        Dictionary<string, string>? dictionary = null;
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary!.ToGetParameters());
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary!.ToGetParameters(null!));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary!.ToGetParameters(null!, null!));
+        Dictionary<string, string> dictionary = null!;
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToGetParameters());
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToGetParameters(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToGetParameters(null!, null!));
     }
 
-    [TestMethod]
+    [Test]
     public void ToGetParameters_ShouldThrow_GivenNullSelector()
     {
         var dictionary = new Dictionary<string, string>();
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.ToGetParameters(null!));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.ToGetParameters(null!, _ => _));
-        Assert.ThrowsException<ArgumentNullException>(() => dictionary.ToGetParameters(_ => _, null!));
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToGetParameters(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToGetParameters(null!, _ => _));
+        Assert.Throws<ArgumentNullException>(() => _ = dictionary.ToGetParameters(_ => _, null!));
     }
 }

X10D.Tests/src/Collections/EnumerableTests.DisposeAll.cs

@@ -1,15 +1,15 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
-using Moq;
+using Moq;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
 public partial class EnumerableTests
 {
-    [TestClass]
+    [TestFixture]
     public class DisposeAllTests
     {
-        [TestMethod]
+        [Test]
         public void DisposeAll_ShouldDisposeAllItems_WhenCalledWithValidList()
         {
             var mock1 = new Mock<IDisposable>();
@@ -24,11 +24,11 @@ public partial class EnumerableTests
             mock3.Verify(i => i.Dispose(), Times.Once);
         }
 
-        [TestMethod]
+        [Test]
         public void DisposeAll_ShouldThrowArgumentNullException_WhenCalledWithNullList()
         {
-            List<IDisposable>? list = null;
-            Assert.ThrowsException<ArgumentNullException>(() => list!.DisposeAll());
+            List<IDisposable> list = null!;
+            Assert.Throws<ArgumentNullException>(() => list.DisposeAll());
         }
     }
 }

X10D.Tests/src/Collections/EnumerableTests.DisposeAllAsync.cs

@@ -1,15 +1,15 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
-using Moq;
+using Moq;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
 public partial class EnumerableTests
 {
-    [TestClass]
+    [TestFixture]
     public class DisposeAllAsyncTests
     {
-        [TestMethod]
+        [Test]
         public async Task DisposeAllAsync_ShouldDisposeAllItems_WhenCalledWithValidList()
         {
             var mock1 = new Mock<IAsyncDisposable>();
@@ -24,11 +24,11 @@ public partial class EnumerableTests
             mock3.Verify(i => i.DisposeAsync(), Times.Once);
         }
 
-        [TestMethod]
-        public async Task DisposeAllAsync_ShouldThrowArgumentNullException_WhenCalledWithNullList()
+        [Test]
+        public void DisposeAllAsync_ShouldThrowArgumentNullException_WhenCalledWithNullList()
         {
-            List<IAsyncDisposable>? list = null;
-            await Assert.ThrowsExceptionAsync<ArgumentNullException>(() => list!.DisposeAllAsync()).ConfigureAwait(false);
+            List<IAsyncDisposable> list = null!;
+            Assert.ThrowsAsync<ArgumentNullException>(() => list.DisposeAllAsync());
         }
     }
 }

X10D.Tests/src/Collections/EnumerableTests.cs

@@ -1,33 +1,33 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 using X10D.Core;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
+[TestFixture]
 public partial class EnumerableTests
 {
-    [TestMethod]
+    [Test]
     public void CountWhereNot_ShouldReturnCorrectCount_GivenSequence()
     {
         var enumerable = new[] {2, 4, 6, 7, 8, 9, 10};
         int count = enumerable.CountWhereNot(x => x % 2 == 0);
-        Assert.AreEqual(2, count);
+        Assert.That(count, Is.EqualTo(2));
     }
 
-    [TestMethod]
+    [Test]
     public void CountWhereNot_ShouldThrowArgumentNullException_GivenNullSource()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((IEnumerable<int>?)null)!.CountWhereNot(x => x % 2 == 0));
+        Assert.Throws<ArgumentNullException>(() => ((IEnumerable<int>?)null)!.CountWhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void CountWhereNot_ShouldThrowArgumentNullException_GivenNullPredicate()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Enumerable.Empty<int>().CountWhereNot(null!));
+        Assert.Throws<ArgumentNullException>(() => Enumerable.Empty<int>().CountWhereNot(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void CountWhereNot_ShouldThrowOverflowException_GivenLargeSource()
     {
         IEnumerable<byte> GetValues()
@@ -40,76 +40,76 @@ public partial class EnumerableTests
             // ReSharper disable once IteratorNeverReturns
         }
 
-        Assert.ThrowsException<OverflowException>(() => GetValues().CountWhereNot(x => x % 2 == 0));
+        Assert.Throws<OverflowException>(() => _ = GetValues().CountWhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNot_ShouldReturnCorrectElements_GivenSequence()
     {
         var enumerable = new[] {2, 4, 6, 7, 8, 9, 10};
         int result = enumerable.FirstWhereNot(x => x % 2 == 0);
-        Assert.AreEqual(7, result);
+        Assert.That(result, Is.EqualTo(7));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNot_ShouldThrowArgumentNullException_GivenNullSource()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((IEnumerable<int>?)null)!.FirstWhereNot(x => x % 2 == 0));
+        Assert.Throws<ArgumentNullException>(() => _ = ((IEnumerable<int>?)null)!.FirstWhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNot_ShouldThrowArgumentNullException_GivenNullPredicate()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Enumerable.Range(0, 1).FirstWhereNot(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = Enumerable.Range(0, 1).FirstWhereNot(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNot_ShouldThrowInvalidOperationException_GivenEmptySource()
     {
-        Assert.ThrowsException<InvalidOperationException>(() => Enumerable.Empty<int>().FirstWhereNot(x => x % 2 == 0));
+        Assert.Throws<InvalidOperationException>(() => _ = Enumerable.Empty<int>().FirstWhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNot_ShouldThrowInvalidOperationException_GivenSourceWithNoMatchingElements()
     {
-        Assert.ThrowsException<InvalidOperationException>(() => 2.AsArrayValue().FirstWhereNot(x => x % 2 == 0));
+        Assert.Throws<InvalidOperationException>(() => _ = 2.AsArrayValue().FirstWhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNotOrDefault_ShouldReturnCorrectElements_GivenSequence()
     {
         var enumerable = new[] {2, 4, 6, 7, 8, 9, 10};
         int result = enumerable.FirstWhereNotOrDefault(x => x % 2 == 0);
-        Assert.AreEqual(7, result);
+        Assert.That(result, Is.EqualTo(7));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNotOrDefault_ShouldThrowArgumentNullException_GivenNullSource()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((IEnumerable<int>?)null)!.FirstWhereNotOrDefault(x => x % 2 == 0));
+        Assert.Throws<ArgumentNullException>(() => _ = ((IEnumerable<int>?)null)!.FirstWhereNotOrDefault(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNotOrDefault_ShouldThrowArgumentNullException_GivenNullPredicate()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Enumerable.Empty<int>().FirstWhereNotOrDefault(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = Enumerable.Empty<int>().FirstWhereNotOrDefault(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNotOrDefault_ShouldReturnDefault_GivenEmptySource()
     {
         int result = Enumerable.Empty<int>().FirstWhereNotOrDefault(x => x % 2 == 0);
-        Assert.AreEqual(default, result);
+        Assert.That(result, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void FirstWhereNotOrDefault_ShouldReturnDefault_GivenSourceWithNoMatchingElements()
     {
         int result = 2.AsArrayValue().FirstWhereNotOrDefault(x => x % 2 == 0);
-        Assert.AreEqual(default, result);
+        Assert.That(result, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void For_ShouldTransform_GivenTransformationDelegate()
     {
         var oneToTen = new[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
@@ -124,21 +124,21 @@ public partial class EnumerableTests
         CollectionAssert.AreEqual(multipliedByIndex, values.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void For_ShouldThrow_GivenNullSource()
     {
         IEnumerable<object>? source = null;
-        Assert.ThrowsException<ArgumentNullException>(() => source!.For((_, _) => { }));
+        Assert.Throws<ArgumentNullException>(() => source!.For((_, _) => { }));
     }
 
-    [TestMethod]
+    [Test]
     public void For_ShouldThrow_GivenNullAction()
     {
         IEnumerable<object> source = ArraySegment<object>.Empty;
-        Assert.ThrowsException<ArgumentNullException>(() => source.For(null!));
+        Assert.Throws<ArgumentNullException>(() => source.For(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void ForEach_ShouldTransform_GivenTransformationDelegate()
     {
         var oneToTen = new[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
@@ -153,93 +153,93 @@ public partial class EnumerableTests
         CollectionAssert.AreEqual(oneToTenDoubled, values.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void ForEach_ShouldThrow_GivenNullSource()
     {
         IEnumerable<object>? source = null;
-        Assert.ThrowsException<ArgumentNullException>(() => source!.ForEach(_ => { }));
+        Assert.Throws<ArgumentNullException>(() => source!.ForEach(_ => { }));
     }
 
-    [TestMethod]
+    [Test]
     public void ForEach_ShouldThrow_GivenNullAction()
     {
         IEnumerable<object> source = ArraySegment<object>.Empty;
-        Assert.ThrowsException<ArgumentNullException>(() => source.ForEach(null!));
+        Assert.Throws<ArgumentNullException>(() => source.ForEach(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNot_ShouldReturnCorrectElements_GivenSequence()
     {
         var enumerable = new[] {2, 4, 6, 7, 8, 9, 10};
         int result = enumerable.LastWhereNot(x => x % 2 == 0);
-        Assert.AreEqual(9, result);
+        Assert.That(result, Is.EqualTo(9));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNot_ShouldThrowArgumentNullException_GivenNullSource()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((IEnumerable<int>?)null)!.LastWhereNot(x => x % 2 == 0));
+        Assert.Throws<ArgumentNullException>(() => _ = ((IEnumerable<int>?)null)!.LastWhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNot_ShouldThrowArgumentNullException_GivenNullPredicate()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Array.Empty<int>().LastWhereNot(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = Array.Empty<int>().LastWhereNot(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNot_ShouldThrowInvalidOperationException_GivenEmptySource()
     {
-        Assert.ThrowsException<InvalidOperationException>(() => Array.Empty<int>().LastWhereNot(x => x % 2 == 0));
+        Assert.Throws<InvalidOperationException>(() => _ = Array.Empty<int>().LastWhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNot_ShouldThrowInvalidOperationException_GivenSourceWithNoMatchingElements()
     {
-        Assert.ThrowsException<InvalidOperationException>(() => 2.AsArrayValue().LastWhereNot(x => x % 2 == 0));
+        Assert.Throws<InvalidOperationException>(() => _ = 2.AsArrayValue().LastWhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNotOrDefault_ShouldReturnCorrectElements_GivenSequence()
     {
         var enumerable = new[] {2, 4, 6, 7, 8, 9, 10};
         int result = enumerable.LastWhereNotOrDefault(x => x % 2 == 0);
-        Assert.AreEqual(9, result);
+        Assert.That(result, Is.EqualTo(9));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNotOrDefault_ShouldThrowArgumentNullException_GivenNullSource()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((IEnumerable<int>?)null)!.LastWhereNotOrDefault(x => x % 2 == 0));
+        Assert.Throws<ArgumentNullException>(() => _ = ((IEnumerable<int>?)null)!.LastWhereNotOrDefault(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNotOrDefault_ShouldThrowArgumentNullException_GivenNullPredicate()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Array.Empty<int>().LastWhereNotOrDefault(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = Array.Empty<int>().LastWhereNotOrDefault(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNotOrDefault_ShouldReturnDefault_GivenEmptySource()
     {
         int result = Array.Empty<int>().LastWhereNotOrDefault(x => x % 2 == 0);
-        Assert.AreEqual(default, result);
+        Assert.That(result, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void LastWhereNotOrDefault_ShouldReturnDefault_GivenSourceWithNoMatchingElements()
     {
         int result = 2.AsArrayValue().LastWhereNotOrDefault(x => x % 2 == 0);
-        Assert.AreEqual(default, result);
+        Assert.That(result, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Shuffled_ShouldThrow_GivenNull()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((List<int>?)null)!.Shuffled());
+        Assert.Throws<ArgumentNullException>(() => _ = ((List<int>?)null)!.Shuffled());
     }
 
-    [TestMethod]
+    [Test]
     public void Shuffled_ShouldReorder_GivenNotNull()
     {
         int[] array = Enumerable.Range(1, 52).ToArray(); // 52! chance of being shuffled to the same order
@@ -251,7 +251,7 @@ public partial class EnumerableTests
         CollectionAssert.AreNotEqual(array, shuffled);
     }
 
-    [TestMethod]
+    [Test]
     public void WhereNot_ShouldReturnCorrectElements_GivenSequence()
     {
         var enumerable = new[] {2, 4, 6, 7, 8, 9, 10};
@@ -259,19 +259,19 @@ public partial class EnumerableTests
         CollectionAssert.AreEqual(new[] {7, 9}, result.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void WhereNot_ShouldThrowArgumentNullException_GivenNullSource()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((IEnumerable<int>?)null)!.WhereNot(x => x % 2 == 0));
+        Assert.Throws<ArgumentNullException>(() => _ = ((IEnumerable<int>?)null)!.WhereNot(x => x % 2 == 0));
     }
 
-    [TestMethod]
+    [Test]
     public void WhereNot_ShouldThrowArgumentNullException_GivenNullPredicate()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Enumerable.Empty<int>().WhereNot(null!));
+        Assert.Throws<ArgumentNullException>(() => _ = Enumerable.Empty<int>().WhereNot(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void WhereNotNull_ShouldContainNoNullElements()
     {
         object?[] array = Enumerable.Repeat(new object(), 10).ToArray();
@@ -289,14 +289,14 @@ public partial class EnumerableTests
             actualCount++;
         }
 
-        Assert.AreEqual(expectedCount, actualCount);
+        Assert.That(actualCount, Is.EqualTo(expectedCount));
     }
 
-    [TestMethod]
+    [Test]
     public void WhereNotNull_ShouldThrowArgumentNullException_GivenNullSource()
     {
         IEnumerable<string> source = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => source.WhereNotNull());
+        Assert.Throws<ArgumentNullException>(() => source.WhereNotNull());
     }
 
     private class DummyClass

X10D.Tests/src/Collections/Int16Tests.cs

@@ -1,119 +1,131 @@
 using System.Runtime.Intrinsics.X86;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
+[TestFixture]
 public class Int16Tests
 {
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldUnpackToArrayCorrectly()
     {
-        const short value = 0b11010100;
-        bool[] bits = value.Unpack();
-
-        Assert.AreEqual(16, bits.Length);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 16; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            const short value = 0b11010100;
+            bool[] bits = value.Unpack();
+
+            Assert.That(bits, Has.Length.EqualTo(16));
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 16; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldUnpackToSpanCorrectly()
     {
         const short value = 0b11010100;
-        Span<bool> bits = stackalloc bool[16];
-        value.Unpack(bits);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 16; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            Span<bool> bits = stackalloc bool[16];
+            value.Unpack(bits);
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 16; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldUnpackToSpanCorrectly_GivenFallbackImplementation()
     {
         const short value = 0b11010100;
-        Span<bool> bits = stackalloc bool[16];
-        value.UnpackInternal_Fallback(bits);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 16; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            Span<bool> bits = stackalloc bool[16];
+            value.UnpackInternal_Fallback(bits);
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 16; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 
 #if NET5_0_OR_GREATER
-    [TestMethod]
+    [Test]
     public void UnpackInternal_Ssse3_ShouldUnpackToSpanCorrectly()
     {
         if (!Sse3.IsSupported)
         {
+            Assert.Pass();
             return;
         }
 
         const short value = 0b11010100;
-        Span<bool> bits = stackalloc bool[16];
-        value.UnpackInternal_Ssse3(bits);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 16; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            Span<bool> bits = stackalloc bool[16];
+            value.UnpackInternal_Ssse3(bits);
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 16; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 #endif
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldRepackEqually()
     {
         const short value = 0b11010100;
-        Assert.AreEqual(value, value.Unpack().PackInt16());
+        Assert.That(value.Unpack().PackInt16(), Is.EqualTo(value));
     }
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldThrow_GivenTooSmallSpan()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             const short value = 0b11010100;
             Span<bool> bits = stackalloc bool[0];

X10D.Tests/src/Collections/Int32Tests.cs

@@ -1,81 +1,90 @@
 using System.Runtime.Intrinsics.X86;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
+[TestFixture]
 public class Int32Tests
 {
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldUnpackToArrayCorrectly()
     {
         const int value = 0b11010100;
-        bool[] bits = value.Unpack();
 
-        Assert.AreEqual(32, bits.Length);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 32; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            bool[] bits = value.Unpack();
+            Assert.That(bits, Has.Length.EqualTo(32));
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 32; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldUnpackToSpanCorrectly()
     {
         const int value = 0b11010100;
-        Span<bool> bits = stackalloc bool[32];
-        value.Unpack(bits);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 32; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            Span<bool> bits = stackalloc bool[32];
+            value.Unpack(bits);
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 32; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void UnpackInternal_Fallback_ShouldUnpackToSpanCorrectly()
     {
         const int value = 0b11010100;
-        Span<bool> bits = stackalloc bool[32];
-        value.UnpackInternal_Fallback(bits);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 32; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            Span<bool> bits = stackalloc bool[32];
+            value.UnpackInternal_Fallback(bits);
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 32; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 
 #if NET5_0_OR_GREATER
-    [TestMethod]
+    [Test]
     public void UnpackInternal_Ssse3_ShouldUnpackToSpanCorrectly()
     {
         if (!Ssse3.IsSupported)
@@ -84,25 +93,28 @@ public class Int32Tests
         }
 
         const int value = 0b11010100;
-        Span<bool> bits = stackalloc bool[32];
-        value.UnpackInternal_Ssse3(bits);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 32; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            Span<bool> bits = stackalloc bool[32];
+            value.UnpackInternal_Ssse3(bits);
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 32; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void UnpackInternal_Avx2_ShouldUnpackToSpanCorrectly()
     {
         if (!Avx2.IsSupported)
@@ -111,36 +123,39 @@ public class Int32Tests
         }
 
         const int value = 0b11010100;
-        Span<bool> bits = stackalloc bool[32];
-        value.UnpackInternal_Avx2(bits);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 32; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index]);
-        }
+            Span<bool> bits = stackalloc bool[32];
+            value.UnpackInternal_Avx2(bits);
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 32; index++)
+            {
+                Assert.That(bits[index], Is.False);
+            }
+        });
     }
 #endif
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldRepackEqually()
     {
         const int value = 0b11010100;
-        Assert.AreEqual(value, value.Unpack().PackInt32());
+        Assert.That(value.Unpack().PackInt32(), Is.EqualTo(value));
     }
 
-    [TestMethod]
+    [Test]
     public void Unpack_ShouldThrow_GivenTooSmallSpan()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             const int value = 0b11010100;
             Span<bool> bits = stackalloc bool[0];

X10D.Tests/src/Collections/Int64Tests.cs

@@ -1,68 +1,73 @@
 using System.Diagnostics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
+[TestFixture]
 public class Int64Tests
 {
-    [TestMethod]
+    [Test]
     public void UnpackBits_ShouldUnpackToArrayCorrectly()
     {
         bool[] bits = 0b11010100L.Unpack();
 
-        Assert.AreEqual(64, bits.Length);
+        Assert.That(bits, Has.Length.EqualTo(64));
 
         Trace.WriteLine(Convert.ToString(0b11010100L, 2));
         Trace.WriteLine(string.Join("", bits.Select(b => b ? "1" : "0")));
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 64; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index], index.ToString());
-        }
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 64; index++)
+            {
+                Assert.That(bits[index], Is.False, index.ToString());
+            }
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void UnpackBits_ShouldUnpackToSpanCorrectly()
     {
-        Span<bool> bits = stackalloc bool[64];
-        0b11010100L.Unpack(bits);
-
-        Assert.IsFalse(bits[0]);
-        Assert.IsFalse(bits[1]);
-        Assert.IsTrue(bits[2]);
-        Assert.IsFalse(bits[3]);
-        Assert.IsTrue(bits[4]);
-        Assert.IsFalse(bits[5]);
-        Assert.IsTrue(bits[6]);
-        Assert.IsTrue(bits[7]);
-
-        for (var index = 8; index < 64; index++)
+        Assert.Multiple(() =>
         {
-            Assert.IsFalse(bits[index], index.ToString());
-        }
+            Span<bool> bits = stackalloc bool[64];
+            0b11010100L.Unpack(bits);
+
+            Assert.That(bits[0], Is.False);
+            Assert.That(bits[1], Is.False);
+            Assert.That(bits[2], Is.True);
+            Assert.That(bits[3], Is.False);
+            Assert.That(bits[4], Is.True);
+            Assert.That(bits[5], Is.False);
+            Assert.That(bits[6], Is.True);
+            Assert.That(bits[7], Is.True);
+
+            for (var index = 8; index < 64; index++)
+            {
+                Assert.That(bits[index], Is.False, index.ToString());
+            }
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void UnpackBits_ShouldRepackEqually()
     {
-        Assert.AreEqual(0b11010100L, 0b11010100L.Unpack().PackInt64());
+        Assert.That(0b11010100L.Unpack().PackInt64(), Is.EqualTo(0b11010100L));
     }
 
-    [TestMethod]
+    [Test]
     public void UnpackBits_ShouldThrow_GivenTooSmallSpan()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             Span<bool> bits = stackalloc bool[0];
             0b11010100L.Unpack(bits);

X10D.Tests/src/Collections/ListTests.cs

@@ -1,16 +1,16 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
+[TestFixture]
 public class ListTests
 {
     [CLSCompliant(false)]
-    [TestMethod]
-    [DataRow(1)]
-    [DataRow(1, 2, 3)]
-    [DataRow(1, 2, 3, 4, 5)]
+    [Test]
+    [TestCase(1)]
+    [TestCase(1, 2, 3)]
+    [TestCase(1, 2, 3, 4, 5)]
     public void Fill_ShouldGiveHomogenousList_GivenValue(params int[] args)
     {
         int[] all42 = Enumerable.Repeat(42, args.Length).ToArray();
@@ -27,154 +27,169 @@ public class ListTests
     }
 
     [CLSCompliant(false)]
-    [TestMethod]
-    [DataRow(1)]
-    [DataRow(1, 2, 3)]
-    [DataRow(1, 2, 3, 4, 5)]
+    [Test]
+    [TestCase(1)]
+    [TestCase(1, 2, 3)]
+    [TestCase(1, 2, 3, 4, 5)]
     public void SlicedFill_ShouldLeaveFirstElement_GivenStartIndex1(params int[] args)
     {
         int first = args[0];
         args.Fill(1, 1, args.Length - 1);
 
         int[] comparison = Enumerable.Repeat(1, args.Length - 1).ToArray();
-        Assert.AreEqual(first, args[0]);
+        Assert.That(args[0], Is.EqualTo(first));
         CollectionAssert.AreEqual(comparison, args[1..]);
     }
 
-    [TestMethod]
+    [Test]
     public void Fill_ShouldThrow_GivenExceededCount()
     {
         int[] array = Array.Empty<int>();
         var list = new List<int>();
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Fill(0, 0, 1));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => list.Fill(0, 0, 1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.Fill(0, 0, 1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => list.Fill(0, 0, 1));
     }
 
-    [TestMethod]
+    [Test]
     public void Fill_ShouldThrow_GivenNegativeCount()
     {
         int[] array = Array.Empty<int>();
         var list = new List<int>();
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Fill(0, 0, -1));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => list.Fill(0, 0, -1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.Fill(0, 0, -1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => list.Fill(0, 0, -1));
     }
 
-    [TestMethod]
+    [Test]
     public void Fill_ShouldThrow_GivenNegativeStartIndex()
     {
         int[] array = Array.Empty<int>();
         var list = new List<int>();
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Fill(0, -1, 0));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => list.Fill(0, -1, 0));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.Fill(0, -1, 0));
+        Assert.Throws<ArgumentOutOfRangeException>(() => list.Fill(0, -1, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void Fill_ShouldThrow_GivenNull()
     {
         int[]? array = null;
         List<int>? list = null;
-        Assert.ThrowsException<ArgumentNullException>(() => array!.Fill(0));
-        Assert.ThrowsException<ArgumentNullException>(() => list!.Fill(0));
-        Assert.ThrowsException<ArgumentNullException>(() => array!.Fill(0, 0, 0));
-        Assert.ThrowsException<ArgumentNullException>(() => list!.Fill(0, 0, 0));
+        Assert.Throws<ArgumentNullException>(() => array!.Fill(0));
+        Assert.Throws<ArgumentNullException>(() => list!.Fill(0));
+        Assert.Throws<ArgumentNullException>(() => array!.Fill(0, 0, 0));
+        Assert.Throws<ArgumentNullException>(() => list!.Fill(0, 0, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void IndexOf_ShouldReturnCorrectValue_FromStartOfList()
     {
         int[] array = {0, 1, 2, 3, 4};
-        Assert.AreEqual(2, array.IndexOf(2));
-        Assert.AreEqual(2, array.IndexOf(2, 0));
-        Assert.AreEqual(2, array.IndexOf(2, 0, 5));
+        Assert.Multiple(() =>
+        {
+            Assert.That(array.IndexOf(2), Is.EqualTo(2));
+            Assert.That(array.IndexOf(2, 0), Is.EqualTo(2));
+            Assert.That(array.IndexOf(2, 0, 5), Is.EqualTo(2));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IndexOf_ShouldReturnCorrectValue_GivenSubRange()
     {
         int[] array = {0, 1, 2, 3, 4, 0};
-        Assert.AreEqual(0, array.IndexOf(0));
-        Assert.AreEqual(0, array.IndexOf(0, 0));
-        Assert.AreEqual(0, array.IndexOf(0, 0, 5));
+        Assert.Multiple(() =>
+        {
+            Assert.That(array.IndexOf(0), Is.Zero);
+            Assert.That(array.IndexOf(0, 0), Is.Zero);
+            Assert.That(array.IndexOf(0, 0, 5), Is.Zero);
 
-        Assert.AreEqual(5, array.IndexOf(0, 1));
-        Assert.AreEqual(5, array.IndexOf(0, 1, 5));
+            Assert.That(array.IndexOf(0, 1), Is.EqualTo(5));
+            Assert.That(array.IndexOf(0, 1, 5), Is.EqualTo(5));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IndexOf_ShouldReturnNegative1_ForEmptyList()
     {
         int[] array = Array.Empty<int>();
-        Assert.AreEqual(-1, array.IndexOf(0));
-        Assert.AreEqual(-1, array.IndexOf(0, 0));
-        Assert.AreEqual(-1, array.IndexOf(0, 0, 0));
+        Assert.Multiple(() =>
+        {
+            Assert.That(array.IndexOf(0), Is.EqualTo(-1));
+            Assert.That(array.IndexOf(0, 0), Is.EqualTo(-1));
+            Assert.That(array.IndexOf(0, 0, 0), Is.EqualTo(-1));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IndexOf_ShouldThrowArgumentNullException_GivenNullList()
     {
         int[]? array = null;
-        Assert.ThrowsException<ArgumentNullException>(() => array!.IndexOf(0));
-        Assert.ThrowsException<ArgumentNullException>(() => array!.IndexOf(0, 0));
-        Assert.ThrowsException<ArgumentNullException>(() => array!.IndexOf(0, 0, 0));
+        Assert.Multiple(() =>
+        {
+            Assert.Throws<ArgumentNullException>(() => array!.IndexOf(0));
+            Assert.Throws<ArgumentNullException>(() => array!.IndexOf(0, 0));
+            Assert.Throws<ArgumentNullException>(() => array!.IndexOf(0, 0, 0));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IndexOf_ShouldThrowArgumentOutOfRangeException_GivenNegativeCount()
     {
         int[] array = Array.Empty<int>();
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.IndexOf(0, 0, -1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.IndexOf(0, 0, -1));
     }
 
-    [TestMethod]
+    [Test]
     public void IndexOf_ShouldThrowArgumentOutOfRangeException_GivenNegativeStartIndex()
     {
         int[] array = Array.Empty<int>();
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.IndexOf(0, -1));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.IndexOf(0, -1, 0));
+        Assert.Multiple(() =>
+        {
+            Assert.Throws<ArgumentOutOfRangeException>(() => array.IndexOf(0, -1));
+            Assert.Throws<ArgumentOutOfRangeException>(() => array.IndexOf(0, -1, 0));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IndexOf_ShouldThrowArgumentOutOfRangeException_GivenInvalidStartIndexCountPair()
     {
         int[] array = {0, 1, 2};
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.IndexOf(0, 2, 4));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.IndexOf(0, 2, 4));
     }
 
-    [TestMethod]
+    [Test]
     public void Random_ShouldReturnContainedObject_GivenNotNull()
     {
         var list = new List<int>(Enumerable.Range(1, 52)); // 52! chance of being shuffled to the same order
         int random = list.Random();
 
-        Assert.IsTrue(list.Contains(random));
+        Assert.That(list, Does.Contain(random));
     }
 
-    [TestMethod]
+    [Test]
     public void Random_ShouldThrow_GivenNull()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((List<int>?)null)!.Random());
+        Assert.Throws<ArgumentNullException>(() => _ = ((List<int>?)null)!.Random());
     }
 
-    [TestMethod]
+    [Test]
     public void RemoveRange_ShouldThrowArgumentNullException_GivenNull()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((List<int>?)null)!.RemoveRange(new Range()));
+        Assert.Throws<ArgumentNullException>(() => ((List<int>?)null)!.RemoveRange(new Range()));
     }
 
-    [TestMethod]
+    [Test]
     public void RemoveRange_ShouldThrowArgumentException_GivenEndIndexLessThanStart()
     {
-        Assert.ThrowsException<ArgumentException>(() => new List<int>().RemoveRange(2..0));
+        Assert.Throws<ArgumentException>(() => new List<int>().RemoveRange(2..0));
     }
 
-    [TestMethod]
+    [Test]
     public void RemoveRange_ShouldThrowArgumentOutOfRangeException_GivenEndIndexGreaterThanOrEqualToCount()
     {
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => new List<int>().RemoveRange(..0));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => new List<int> {1}.RemoveRange(..2));
+        Assert.Throws<ArgumentOutOfRangeException>(() => new List<int>().RemoveRange(..0));
+        Assert.Throws<ArgumentOutOfRangeException>(() => new List<int> {1}.RemoveRange(..2));
     }
 
-    [TestMethod]
+    [Test]
     public void RemoveRange_ShouldRemoveElements_GivenList()
     {
         var list = new List<int>
@@ -191,13 +206,14 @@ public class ListTests
             10
         };
 
-        Assert.AreEqual(10, list.Count);
+        Assert.That(list, Has.Count.EqualTo(10));
         list.RemoveRange(2..5);
-        Assert.AreEqual(6, list.Count);
+
+        Assert.That(list, Has.Count.EqualTo(6));
         CollectionAssert.AreEqual(new[] {1, 2, 7, 8, 9, 10}, list);
     }
 
-    [TestMethod]
+    [Test]
     public void Shuffle_ShouldReorder_GivenNotNull()
     {
         var list = new List<int>(Enumerable.Range(1, 52)); // 52! chance of being shuffled to the same order
@@ -210,27 +226,27 @@ public class ListTests
         CollectionAssert.AreNotEqual(list, shuffled);
     }
 
-    [TestMethod]
+    [Test]
     public void Shuffle_ShouldThrow_GivenNull()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((List<int>?)null)!.Shuffle());
+        Assert.Throws<ArgumentNullException>(() => ((List<int>?)null)!.Shuffle());
     }
 
-    [TestMethod]
+    [Test]
     public void Slice_ShouldReturnCorrectValue_GivenStartIndex()
     {
         int[] array = {0, 1, 2, 3, 4, 5};
         CollectionAssert.AreEqual(new[] {2, 3, 4, 5}, array.Slice(2).ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void Slice_ShouldReturnCorrectValue_GivenStartIndexAndLength()
     {
         int[] array = {0, 1, 2, 3, 4, 5};
         CollectionAssert.AreEqual(new[] {2, 3, 4}, array.Slice(2, 3).ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void Slice_ShouldReturnEmptyList_ForEmptyList()
     {
         int[] array = Array.Empty<int>();
@@ -238,49 +254,49 @@ public class ListTests
         CollectionAssert.AreEqual(Array.Empty<int>(), array.Slice(0, 0).ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void Slice_ShouldThrowArgumentNullException_GivenNullList()
     {
         int[]? array = null;
-        Assert.ThrowsException<ArgumentNullException>(() => array!.Slice(0));
-        Assert.ThrowsException<ArgumentNullException>(() => array!.Slice(0, 0));
+        Assert.Throws<ArgumentNullException>(() => array!.Slice(0));
+        Assert.Throws<ArgumentNullException>(() => array!.Slice(0, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void Slice_ShouldThrowArgumentOutOfRangeException_GivenNegativeCount()
     {
         int[] array = Array.Empty<int>();
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Slice(0, -1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.Slice(0, -1));
     }
 
-    [TestMethod]
+    [Test]
     public void Slice_ShouldThrowArgumentOutOfRangeException_GivenNegativeStartIndex()
     {
         int[] array = Array.Empty<int>();
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Slice(-1));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Slice(-1, 0));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.Slice(-1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.Slice(-1, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void Slice_ShouldThrowArgumentOutOfRangeException_GivenInvalidStartIndexCountPair()
     {
         int[] array = {0, 1, 2};
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.Slice(2, 4));
+        Assert.Throws<ArgumentOutOfRangeException>(() => array.Slice(2, 4));
     }
 
-    [TestMethod]
+    [Test]
     public void Swap_ShouldThrowArgumentNullException_GivenNullSource()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((IList<int>?)null)!.Swap(new List<int>()));
+        Assert.Throws<ArgumentNullException>(() => ((IList<int>?)null)!.Swap(new List<int>()));
     }
 
-    [TestMethod]
+    [Test]
     public void Swap_ShouldThrowArgumentNullException_GivenNullTarget()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => new List<int>().Swap(null!));
+        Assert.Throws<ArgumentNullException>(() => new List<int>().Swap(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void Swap_ShouldSwapElements_GivenMatchingElementCount()
     {
         var first = new List<int> {1, 2, 3};
@@ -297,7 +313,7 @@ public class ListTests
         CollectionAssert.AreEqual(new[] {4, 5, 6}, second, string.Join(' ', second));
     }
 
-    [TestMethod]
+    [Test]
     public void Swap_ShouldSwapElements_GivenDifferentElementCount()
     {
         var first = new List<int>

X10D.Tests/src/Collections/SpanTest.cs

@@ -1,52 +1,52 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 
 namespace X10D.Tests.Collections;
 
-[TestClass]
+[TestFixture]
 public class SpanTest
 {
-    [TestMethod]
+    [Test]
     public void Count_ShouldReturn0_GivenEmptySpan()
     {
         Span<int> span = Span<int>.Empty;
 
         int count = span.Count(2);
 
-        Assert.AreEqual(0, count);
+        Assert.That(count, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Count_ShouldReturn0_GivenEmptyReadOnlySpan()
     {
         ReadOnlySpan<int> span = ReadOnlySpan<int>.Empty;
 
         int count = span.Count(2);
 
-        Assert.AreEqual(0, count);
+        Assert.That(count, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Count_ShouldReturn8_GivenSpanWith8MatchingElements()
     {
         Span<int> span = stackalloc int[16] {1, 2, 3, 2, 5, 2, 7, 2, 9, 2, 11, 2, 13, 2, 15, 2};
 
         int count = span.Count(2);
 
-        Assert.AreEqual(8, count);
+        Assert.That(count, Is.EqualTo(8));
     }
 
-    [TestMethod]
+    [Test]
     public void Count_ShouldReturn8_GivenReadOnlySpanWith8MatchingElements()
     {
         ReadOnlySpan<int> span = stackalloc int[16] {1, 2, 3, 2, 5, 2, 7, 2, 9, 2, 11, 2, 13, 2, 15, 2};
 
         int count = span.Count(2);
 
-        Assert.AreEqual(8, count);
+        Assert.That(count, Is.EqualTo(8));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnEmptySpan_ShouldYieldNothing_UsingCharDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = ReadOnlySpan<char>.Empty;
@@ -57,10 +57,10 @@ public class SpanTest
             index++;
         }
 
-        Assert.AreEqual(0, index);
+        Assert.That(index, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnEmptySpan_ShouldYieldNothing_UsingCharDelimiter_GivenSpan()
     {
         Span<char> span = Span<char>.Empty;
@@ -71,10 +71,10 @@ public class SpanTest
             index++;
         }
 
-        Assert.AreEqual(0, index);
+        Assert.That(index, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnEmptySpan_ShouldYieldNothing_UsingStringDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = ReadOnlySpan<char>.Empty;
@@ -85,10 +85,10 @@ public class SpanTest
             index++;
         }
 
-        Assert.AreEqual(0, index);
+        Assert.That(index, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnEmptySpan_ShouldYieldNothing_UsingStringDelimiter_GivenSpan()
     {
         Span<char> span = Span<char>.Empty;
@@ -99,10 +99,10 @@ public class SpanTest
             index++;
         }
 
-        Assert.AreEqual(0, index);
+        Assert.That(index, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnOneWord_ShouldYieldLength1_UsingCharDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = "Hello ".AsSpan();
@@ -112,16 +112,16 @@ public class SpanTest
         {
             if (index == 0)
             {
-                Assert.AreEqual("Hello", subSpan.ToString());
+                Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
             }
 
             index++;
         }
 
-        Assert.AreEqual(1, index);
+        Assert.That(index, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnOneWord_ShouldYieldLength1_UsingCharDelimiter_GivenSpan()
     {
         ReadOnlySpan<char> source = "Hello ".AsSpan();
@@ -133,16 +133,16 @@ public class SpanTest
         {
             if (index == 0)
             {
-                Assert.AreEqual("Hello", subSpan.ToString());
+                Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
             }
 
             index++;
         }
 
-        Assert.AreEqual(1, index);
+        Assert.That(index, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnOneWord_ShouldYieldLength1_UsingStringDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = "Hello ".AsSpan();
@@ -152,16 +152,16 @@ public class SpanTest
         {
             if (index == 0)
             {
-                Assert.AreEqual("Hello", subSpan.ToString());
+                Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
             }
 
             index++;
         }
 
-        Assert.AreEqual(1, index);
+        Assert.That(index, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnOneWord_ShouldYieldLength1_UsingStringDelimiter_GivenSpan()
     {
         ReadOnlySpan<char> source = "Hello ".AsSpan();
@@ -173,16 +173,16 @@ public class SpanTest
         {
             if (index == 0)
             {
-                Assert.AreEqual("Hello", subSpan.ToString());
+                Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
             }
 
             index++;
         }
 
-        Assert.AreEqual(1, index);
+        Assert.That(index, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnOneWordWithoutDelimiter_ShouldYieldLength1_UsingCharDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = "Hello".AsSpan();
@@ -192,16 +192,16 @@ public class SpanTest
         {
             if (index == 0)
             {
-                Assert.AreEqual("Hello", subSpan.ToString());
+                Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
             }
 
             index++;
         }
 
-        Assert.AreEqual(1, index);
+        Assert.That(index, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnOneWordWithoutDelimiter_ShouldYieldLength1_UsingCharDelimiter_GivenSpan()
     {
         ReadOnlySpan<char> source = "Hello".AsSpan();
@@ -213,16 +213,16 @@ public class SpanTest
         {
             if (index == 0)
             {
-                Assert.AreEqual("Hello", subSpan.ToString());
+                Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
             }
 
             index++;
         }
 
-        Assert.AreEqual(1, index);
+        Assert.That(index, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnOneWordWithoutDelimiter_ShouldYieldLength1_UsingStringDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = "Hello".AsSpan();
@@ -232,16 +232,16 @@ public class SpanTest
         {
             if (index == 0)
             {
-                Assert.AreEqual("Hello", subSpan.ToString());
+                Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
             }
 
             index++;
         }
 
-        Assert.AreEqual(1, index);
+        Assert.That(index, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnOneWordWithoutDelimiter_ShouldYieldLength1_UsingStringDelimiter_GivenSpan()
     {
         ReadOnlySpan<char> source = "Hello".AsSpan();
@@ -253,16 +253,16 @@ public class SpanTest
         {
             if (index == 0)
             {
-                Assert.AreEqual("Hello", subSpan.ToString());
+                Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
             }
 
             index++;
         }
 
-        Assert.AreEqual(1, index);
+        Assert.That(index, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnTwoWords_ShouldYieldLength2_UsingCharDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = "Hello World ".AsSpan();
@@ -273,20 +273,20 @@ public class SpanTest
             switch (index)
             {
                 case 0:
-                    Assert.AreEqual("Hello", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
                     break;
                 case 1:
-                    Assert.AreEqual("World", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("World"));
                     break;
             }
 
             index++;
         }
 
-        Assert.AreEqual(2, index);
+        Assert.That(index, Is.EqualTo(2));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnTwoWords_ShouldYieldLength2_UsingCharDelimiter_GivenSpan()
     {
         ReadOnlySpan<char> source = "Hello World ".AsSpan();
@@ -299,20 +299,20 @@ public class SpanTest
             switch (index)
             {
                 case 0:
-                    Assert.AreEqual("Hello", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
                     break;
                 case 1:
-                    Assert.AreEqual("World", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("World"));
                     break;
             }
 
             index++;
         }
 
-        Assert.AreEqual(2, index);
+        Assert.That(index, Is.EqualTo(2));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnTwoWords_ShouldYieldLength2_UsingStringDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = "Hello World ".AsSpan();
@@ -323,20 +323,20 @@ public class SpanTest
             switch (index)
             {
                 case 0:
-                    Assert.AreEqual("Hello", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
                     break;
                 case 1:
-                    Assert.AreEqual("World", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("World"));
                     break;
             }
 
             index++;
         }
 
-        Assert.AreEqual(2, index);
+        Assert.That(index, Is.EqualTo(2));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnTwoWords_ShouldYieldLength2_UsingStringDelimiter_GivenSpan()
     {
         ReadOnlySpan<char> source = "Hello World ".AsSpan();
@@ -349,20 +349,20 @@ public class SpanTest
             switch (index)
             {
                 case 0:
-                    Assert.AreEqual("Hello", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("Hello"));
                     break;
                 case 1:
-                    Assert.AreEqual("World", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("World"));
                     break;
             }
 
             index++;
         }
 
-        Assert.AreEqual(2, index);
+        Assert.That(index, Is.EqualTo(2));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnThreeWords_ShouldYieldLength3_UsingCharDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = "Hello, the World ".AsSpan();
@@ -373,23 +373,23 @@ public class SpanTest
             switch (index)
             {
                 case 0:
-                    Assert.AreEqual("Hello,", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("Hello,"));
                     break;
                 case 1:
-                    Assert.AreEqual("the", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("the"));
                     break;
                 case 2:
-                    Assert.AreEqual("World", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("World"));
                     break;
             }
 
             index++;
         }
 
-        Assert.AreEqual(3, index);
+        Assert.That(index, Is.EqualTo(3));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnThreeWords_ShouldYieldLength3_UsingCharDelimiter_GivenSpan()
     {
         ReadOnlySpan<char> source = "Hello, the World ".AsSpan();
@@ -402,23 +402,23 @@ public class SpanTest
             switch (index)
             {
                 case 0:
-                    Assert.AreEqual("Hello,", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("Hello,"));
                     break;
                 case 1:
-                    Assert.AreEqual("the", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("the"));
                     break;
                 case 2:
-                    Assert.AreEqual("World", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("World"));
                     break;
             }
 
             index++;
         }
 
-        Assert.AreEqual(3, index);
+        Assert.That(index, Is.EqualTo(3));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnThreeWords_ShouldYieldLength3_UsingStringDelimiter_GivenReadOnlySpan()
     {
         ReadOnlySpan<char> span = "Hello, the World ".AsSpan();
@@ -429,23 +429,23 @@ public class SpanTest
             switch (index)
             {
                 case 0:
-                    Assert.AreEqual("Hello,", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("Hello,"));
                     break;
                 case 1:
-                    Assert.AreEqual("the", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("the"));
                     break;
                 case 2:
-                    Assert.AreEqual("World", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("World"));
                     break;
             }
 
             index++;
         }
 
-        Assert.AreEqual(3, index);
+        Assert.That(index, Is.EqualTo(3));
     }
 
-    [TestMethod]
+    [Test]
     public void Split_OnThreeWords_ShouldYieldLength3_UsingStringDelimiter_GivenSpan()
     {
         ReadOnlySpan<char> source = "Hello, the World ".AsSpan();
@@ -458,19 +458,19 @@ public class SpanTest
             switch (index)
             {
                 case 0:
-                    Assert.AreEqual("Hello,", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("Hello,"));
                     break;
                 case 1:
-                    Assert.AreEqual("the", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("the"));
                     break;
                 case 2:
-                    Assert.AreEqual("World", subSpan.ToString());
+                    Assert.That(subSpan.ToString(), Is.EqualTo("World"));
                     break;
             }
 
             index++;
         }
 
-        Assert.AreEqual(3, index);
+        Assert.That(index, Is.EqualTo(3));
     }
 }

X10D.Tests/src/Core/CoreTests.cs

@@ -1,76 +1,78 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Core;
 
 namespace X10D.Tests.Core;
 
-[TestClass]
+[TestFixture]
 public class CoreTests
 {
-    [TestMethod]
-    [DataRow(1)]
-    [DataRow("f")]
-    [DataRow(true)]
+    [Test]
+    [TestCase(1)]
+    [TestCase("f")]
+    [TestCase(true)]
     public void AsArrayValue_ShouldBeLength1_GivenValue(object o)
     {
-        object[] array = o.AsArrayValue()!;
-        Assert.IsNotNull(array);
-        Assert.IsTrue(array.Length == 1);
+        object[] array = o.AsArrayValue();
+        Assert.That(array, Is.Not.Null);
+        Assert.That(array, Has.Length.EqualTo(1));
     }
 
-    [TestMethod]
-    [DataRow(1)]
-    [DataRow("f")]
-    [DataRow(true)]
+    [Test]
+    [TestCase(1)]
+    [TestCase("f")]
+    [TestCase(true)]
     public void AsArrayValue_ShouldContainValue_Given_Value(object o)
     {
-        object[] array = o.AsArrayValue()!;
-        Assert.IsNotNull(array);
-        Assert.AreEqual(o, array[0]);
+        object[] array = o.AsArrayValue();
+        Assert.That(array, Is.Not.Null);
+        Assert.That(array[0], Is.EqualTo(o));
     }
 
-    [TestMethod]
-    [DataRow(1)]
-    [DataRow("f")]
-    [DataRow(true)]
+    [Test]
+    [TestCase(1)]
+    [TestCase("f")]
+    [TestCase(true)]
     public void AsEnumerableValue_ShouldBeLength1_GivenValue(object o)
     {
-        IEnumerable<object> enumerable = o.AsEnumerableValue()!;
-        Assert.IsNotNull(enumerable);
-        Assert.IsTrue(enumerable.Count() == 1);
+        object[] enumerable = o.AsEnumerableValue().ToArray();
+        Assert.That(enumerable, Is.Not.Null);
+        Assert.That(enumerable, Has.Length.EqualTo(1));
     }
 
-    [TestMethod]
-    [DataRow(1)]
-    [DataRow("f")]
-    [DataRow(true)]
+    [Test]
+    [TestCase(1)]
+    [TestCase("f")]
+    [TestCase(true)]
     public void AsEnumerableValue_ShouldContainValue_Given_Value(object o)
     {
-        IEnumerable<object> enumerable = o.AsEnumerableValue()!;
-        Assert.IsNotNull(enumerable);
-        Assert.AreEqual(o, enumerable.ElementAt(0));
+        object[] enumerable = o.AsEnumerableValue().ToArray();
+        Assert.That(enumerable, Is.Not.Null);
+        Assert.That(enumerable.ElementAt(0), Is.EqualTo(o));
     }
 
-    [TestMethod]
-    [DataRow(1)]
-    [DataRow("f")]
-    [DataRow(true)]
+    [Test]
+    [TestCase(1)]
+    [TestCase("f")]
+    [TestCase(true)]
     public void RepeatValue_ShouldContainRepeatedValue_GivenValue(object o)
     {
         IEnumerable<object> enumerable = o.RepeatValue(10);
-        Assert.IsNotNull(enumerable);
+        // ReSharper disable once PossibleMultipleEnumeration
+        Assert.That(enumerable, Is.Not.Null);
 
+        // ReSharper disable once PossibleMultipleEnumeration
         object[] array = enumerable.ToArray();
-        Assert.AreEqual(10, array.Length);
+        Assert.That(array, Has.Length.EqualTo(10));
         CollectionAssert.AreEqual(new[] {o, o, o, o, o, o, o, o, o, o}, array);
     }
 
-    [TestMethod]
-    [DataRow(1)]
-    [DataRow("f")]
-    [DataRow(true)]
+    [Test]
+    [TestCase(1)]
+    [TestCase("f")]
+    [TestCase(true)]
     public void RepeatValue_ShouldThrow_GivenNegativeCount(object o)
     {
         // we must force enumeration via ToArray() to ensure the exception is thrown
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => o.RepeatValue(-1).ToArray());
+        Assert.Throws<ArgumentOutOfRangeException>(() => _ = o.RepeatValue(-1).ToArray());
     }
 }

X10D.Tests/src/Core/EnumTests.cs

@@ -1,9 +1,9 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Core;
 
 namespace X10D.Tests.Core;
 
-[TestClass]
+[TestFixture]
 public class EnumTests
 {
     // Microsoft wrongfully decided to have Sunday be 0, Monday be 1, etc.
@@ -12,51 +12,63 @@ public class EnumTests
     // but Microsoft can't fix this without breaking compatibility.
     // I have feelings...
 
-    [TestMethod]
+    [Test]
     public void Next()
     {
-        Assert.AreEqual(DayOfWeek.Monday, DayOfWeek.Sunday.Next());
-        Assert.AreEqual(DayOfWeek.Tuesday, DayOfWeek.Monday.Next());
-        Assert.AreEqual(DayOfWeek.Wednesday, DayOfWeek.Tuesday.Next());
-        Assert.AreEqual(DayOfWeek.Thursday, DayOfWeek.Wednesday.Next());
-        Assert.AreEqual(DayOfWeek.Friday, DayOfWeek.Thursday.Next());
-        Assert.AreEqual(DayOfWeek.Saturday, DayOfWeek.Friday.Next());
-        Assert.AreEqual(DayOfWeek.Sunday, DayOfWeek.Saturday.Next()); // Saturday is the "last" day. wrap to "first"
+        Assert.Multiple(() =>
+        {
+            Assert.That(DayOfWeek.Sunday.Next(), Is.EqualTo(DayOfWeek.Monday));
+            Assert.That(DayOfWeek.Monday.Next(), Is.EqualTo(DayOfWeek.Tuesday));
+            Assert.That(DayOfWeek.Tuesday.Next(), Is.EqualTo(DayOfWeek.Wednesday));
+            Assert.That(DayOfWeek.Wednesday.Next(), Is.EqualTo(DayOfWeek.Thursday));
+            Assert.That(DayOfWeek.Thursday.Next(), Is.EqualTo(DayOfWeek.Friday));
+            Assert.That(DayOfWeek.Friday.Next(), Is.EqualTo(DayOfWeek.Saturday));
+            Assert.That(DayOfWeek.Saturday.Next(), Is.EqualTo(DayOfWeek.Sunday)); // Saturday is the "last" day. wrap to "first"
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void NextUnchecked()
     {
-        Assert.AreEqual(DayOfWeek.Monday, DayOfWeek.Sunday.NextUnchecked());
-        Assert.AreEqual(DayOfWeek.Tuesday, DayOfWeek.Monday.NextUnchecked());
-        Assert.AreEqual(DayOfWeek.Wednesday, DayOfWeek.Tuesday.NextUnchecked());
-        Assert.AreEqual(DayOfWeek.Thursday, DayOfWeek.Wednesday.NextUnchecked());
-        Assert.AreEqual(DayOfWeek.Friday, DayOfWeek.Thursday.NextUnchecked());
-        Assert.AreEqual(DayOfWeek.Saturday, DayOfWeek.Friday.NextUnchecked());
-        Assert.ThrowsException<IndexOutOfRangeException>(() => DayOfWeek.Saturday.NextUnchecked());
+        Assert.Multiple(() =>
+        {
+            Assert.That(DayOfWeek.Sunday.NextUnchecked(), Is.EqualTo(DayOfWeek.Monday));
+            Assert.That(DayOfWeek.Monday.NextUnchecked(), Is.EqualTo(DayOfWeek.Tuesday));
+            Assert.That(DayOfWeek.Tuesday.NextUnchecked(), Is.EqualTo(DayOfWeek.Wednesday));
+            Assert.That(DayOfWeek.Wednesday.NextUnchecked(), Is.EqualTo(DayOfWeek.Thursday));
+            Assert.That(DayOfWeek.Thursday.NextUnchecked(), Is.EqualTo(DayOfWeek.Friday));
+            Assert.That(DayOfWeek.Friday.NextUnchecked(), Is.EqualTo(DayOfWeek.Saturday));
+        });
+        Assert.Throws<IndexOutOfRangeException>(() => _ = DayOfWeek.Saturday.NextUnchecked());
     }
 
-    [TestMethod]
+    [Test]
     public void Previous()
     {
-        Assert.AreEqual(DayOfWeek.Saturday, DayOfWeek.Sunday.Previous()); // Sunday is the "first" day. wrap to "last"
-        Assert.AreEqual(DayOfWeek.Sunday, DayOfWeek.Monday.Previous());
-        Assert.AreEqual(DayOfWeek.Monday, DayOfWeek.Tuesday.Previous());
-        Assert.AreEqual(DayOfWeek.Tuesday, DayOfWeek.Wednesday.Previous());
-        Assert.AreEqual(DayOfWeek.Wednesday, DayOfWeek.Thursday.Previous());
-        Assert.AreEqual(DayOfWeek.Thursday, DayOfWeek.Friday.Previous());
-        Assert.AreEqual(DayOfWeek.Friday, DayOfWeek.Saturday.Previous());
+        Assert.Multiple(() =>
+        {
+            Assert.That(DayOfWeek.Sunday.Previous(), Is.EqualTo(DayOfWeek.Saturday)); // Sunday is the "first" day. wrap to "last"
+            Assert.That(DayOfWeek.Monday.Previous(), Is.EqualTo(DayOfWeek.Sunday));
+            Assert.That(DayOfWeek.Tuesday.Previous(), Is.EqualTo(DayOfWeek.Monday));
+            Assert.That(DayOfWeek.Wednesday.Previous(), Is.EqualTo(DayOfWeek.Tuesday));
+            Assert.That(DayOfWeek.Thursday.Previous(), Is.EqualTo(DayOfWeek.Wednesday));
+            Assert.That(DayOfWeek.Friday.Previous(), Is.EqualTo(DayOfWeek.Thursday));
+            Assert.That(DayOfWeek.Saturday.Previous(), Is.EqualTo(DayOfWeek.Friday));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void PreviousUnchecked()
     {
-        Assert.AreEqual(DayOfWeek.Sunday, DayOfWeek.Monday.PreviousUnchecked());
-        Assert.AreEqual(DayOfWeek.Monday, DayOfWeek.Tuesday.PreviousUnchecked());
-        Assert.AreEqual(DayOfWeek.Tuesday, DayOfWeek.Wednesday.PreviousUnchecked());
-        Assert.AreEqual(DayOfWeek.Wednesday, DayOfWeek.Thursday.PreviousUnchecked());
-        Assert.AreEqual(DayOfWeek.Thursday, DayOfWeek.Friday.PreviousUnchecked());
-        Assert.AreEqual(DayOfWeek.Friday, DayOfWeek.Saturday.PreviousUnchecked());
-        Assert.ThrowsException<IndexOutOfRangeException>(() => DayOfWeek.Sunday.PreviousUnchecked());
+        Assert.Multiple(() =>
+        {
+            Assert.That(DayOfWeek.Monday.PreviousUnchecked(), Is.EqualTo(DayOfWeek.Sunday));
+            Assert.That(DayOfWeek.Tuesday.PreviousUnchecked(), Is.EqualTo(DayOfWeek.Monday));
+            Assert.That(DayOfWeek.Wednesday.PreviousUnchecked(), Is.EqualTo(DayOfWeek.Tuesday));
+            Assert.That(DayOfWeek.Thursday.PreviousUnchecked(), Is.EqualTo(DayOfWeek.Wednesday));
+            Assert.That(DayOfWeek.Friday.PreviousUnchecked(), Is.EqualTo(DayOfWeek.Thursday));
+            Assert.That(DayOfWeek.Saturday.PreviousUnchecked(), Is.EqualTo(DayOfWeek.Friday));
+        });
+        Assert.Throws<IndexOutOfRangeException>(() => _ = DayOfWeek.Sunday.PreviousUnchecked());
     }
 }

X10D.Tests/src/Core/IntrinsicTests.cs

@@ -1,15 +1,15 @@
 #if NET6_0_OR_GREATER
 using System.Runtime.Intrinsics;
 using System.Runtime.Intrinsics.X86;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Core;
 
 namespace X10D.Tests.Core;
 
-[TestClass]
+[TestFixture]
 public class IntrinsicTests
 {
-    [TestMethod]
+    [Test]
     public void CorrectBoolean_ShouldReturnExpectedVector64Result_GivenInputVector()
     {
         var inputVector = Vector64.Create(0, 1, 2, 0, 3, 0, 0, (byte)4);
@@ -17,10 +17,10 @@ public class IntrinsicTests
 
         Vector64<byte> result = inputVector.CorrectBoolean();
 
-        Assert.AreEqual(expectedResult, result);
+        Assert.That(result, Is.EqualTo(expectedResult));
     }
 
-    [TestMethod]
+    [Test]
     public void CorrectBooleanInternal_Fallback_ShouldReturnExpectedVector128Result_GivenInputVector()
     {
         var inputVector = Vector128.Create(0, 1, 2, 0, 3, 0, 0, 4, 5, 0, 0, 6, 0, 0, 7, (byte)8);
@@ -28,10 +28,10 @@ public class IntrinsicTests
 
         Vector128<byte> result = inputVector.CorrectBooleanInternal_Fallback();
 
-        Assert.AreEqual(expectedResult, result);
+        Assert.That(result, Is.EqualTo(expectedResult));
     }
 
-    [TestMethod]
+    [Test]
     public void CorrectBooleanInternal_Sse2_ShouldReturnExpectedVector128Result_GivenInputVector()
     {
         if (!Sse2.IsSupported)
@@ -44,10 +44,10 @@ public class IntrinsicTests
 
         Vector128<byte> result = inputVector.CorrectBooleanInternal_Sse2();
 
-        Assert.AreEqual(expectedResult, result);
+        Assert.That(result, Is.EqualTo(expectedResult));
     }
 
-    [TestMethod]
+    [Test]
     public void CorrectBooleanInternal_Avx2_ShouldReturnExpectedVector256Result_GivenInputVector()
     {
         if (!Avx2.IsSupported)
@@ -62,10 +62,10 @@ public class IntrinsicTests
 
         Vector256<byte> result = inputVector.CorrectBooleanInternal_Avx2();
 
-        Assert.AreEqual(expectedResult, result);
+        Assert.That(result, Is.EqualTo(expectedResult));
     }
 
-    [TestMethod]
+    [Test]
     public void CorrectBooleanInternal_Fallback_ShouldReturnExpectedVector256Result_GivenInputVector()
     {
         var inputVector = Vector256.Create(0, 1, 2, 0, 3, 0, 0, 4, 5, 0, 0, 6, 0, 0, 7, 8, 0, 1, 2, 0, 3, 0, 0, 4, 5, 0, 0, 6, 0,
@@ -75,10 +75,10 @@ public class IntrinsicTests
 
         Vector256<byte> result = inputVector.CorrectBooleanInternal_Fallback();
 
-        Assert.AreEqual(expectedResult, result);
+        Assert.That(result, Is.EqualTo(expectedResult));
     }
 
-    [TestMethod]
+    [Test]
     public void HorizontalOr_ShouldReturnCombinedVector_GivenInputVector128OfUInt32()
     {
         Vector128<uint> left = Vector128.Create(1U, 2U, 3U, 4U);
@@ -87,10 +87,10 @@ public class IntrinsicTests
         Vector128<uint> expected = Vector128.Create(3U, 7U, 7U, 15U);
         Vector128<uint> actual = IntrinsicUtility.HorizontalOr(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void HorizontalOrInternal_Sse_ShouldReturnCombinedVector_GivenInputVector128OfInt32()
     {
         Vector128<int> left = Vector128.Create(1, 2, 3, 4);
@@ -99,10 +99,10 @@ public class IntrinsicTests
         Vector128<int> expected = Vector128.Create(3, 7, 7, 15);
         Vector128<int> actual = IntrinsicUtility.HorizontalOr_Sse(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void HorizontalOrInternal_Fallback_ShouldReturnCombinedVector_GivenInputVector128OfInt32()
     {
         Vector128<int> left = Vector128.Create(1, 2, 3, 4);
@@ -111,10 +111,10 @@ public class IntrinsicTests
         Vector128<int> expected = Vector128.Create(3, 7, 7, 15);
         Vector128<int> actual = IntrinsicUtility.HorizontalOrInternal_Fallback(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void Multiply_ShouldReturnMultipliedVector_GivenInputVector128OfInt64()
     {
         Vector128<long> left = Vector128.Create(6L, 4L);
@@ -123,10 +123,10 @@ public class IntrinsicTests
         Vector128<long> expected = Vector128.Create(12L, 12L);
         Vector128<long> actual = IntrinsicUtility.Multiply(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void MultiplyInternal_Sse2_ShouldReturnMultipliedVector_GivenInputVector128OfUInt64()
     {
         if (!Sse2.IsSupported)
@@ -140,10 +140,10 @@ public class IntrinsicTests
         Vector128<ulong> expected = Vector128.Create(12UL, 12UL);
         Vector128<ulong> actual = IntrinsicUtility.MultiplyInternal_Sse2(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void MultiplyInternal_Fallback_ShouldReturnMultipliedVector_GivenInputVector128OfUInt64()
     {
         Vector128<ulong> left = Vector128.Create(6UL, 4UL);
@@ -152,10 +152,10 @@ public class IntrinsicTests
         Vector128<ulong> expected = Vector128.Create(12UL, 12UL);
         Vector128<ulong> actual = IntrinsicUtility.MultiplyInternal_Fallback(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void Multiply_ShouldReturnMultipliedVector_GivenInputVector256OfInt64()
     {
         Vector256<long> left = Vector256.Create(4L, 6L, 8L, 10L);
@@ -164,10 +164,10 @@ public class IntrinsicTests
         Vector256<long> expected = Vector256.Create(8L, 18L, 32L, 50L);
         Vector256<long> actual = IntrinsicUtility.Multiply(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void MultiplyInternal_Avx2_ShouldReturnMultipliedVector_GivenInputVector256OfUInt64()
     {
         if (!Avx2.IsSupported)
@@ -181,10 +181,10 @@ public class IntrinsicTests
         Vector256<ulong> expected = Vector256.Create(8UL, 18UL, 32UL, 50UL);
         Vector256<ulong> actual = IntrinsicUtility.MultiplyInternal_Avx2(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void MultiplyInternal_Fallback_ShouldReturnMultipliedVector_GivenInputVector256OfUInt64()
     {
         Vector256<ulong> left = Vector256.Create(4UL, 6UL, 8UL, 10UL);
@@ -193,10 +193,10 @@ public class IntrinsicTests
         Vector256<ulong> expected = Vector256.Create(8UL, 18UL, 32UL, 50UL);
         Vector256<ulong> actual = IntrinsicUtility.MultiplyInternal_Fallback(left, right);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void ReverseElementsInternal_Fallback_ShouldReturnExpectedVector128Result_GivenInputVector()
     {
         var inputVector = Vector128.Create(42UL, 69UL);
@@ -204,10 +204,10 @@ public class IntrinsicTests
 
         Vector128<ulong> result = inputVector.ReverseElementsInternal_Fallback();
 
-        Assert.AreEqual(expectedResult, result);
+        Assert.That(result, Is.EqualTo(expectedResult));
     }
 
-    [TestMethod]
+    [Test]
     public void ReverseElementsInternal_Sse2_ShouldReturnExpectedVector128Result_GivenInputVector()
     {
         if (!Sse2.IsSupported)
@@ -220,7 +220,7 @@ public class IntrinsicTests
 
         Vector128<ulong> result = inputVector.ReverseElementsInternal_Sse2();
 
-        Assert.AreEqual(expectedResult, result);
+        Assert.That(result, Is.EqualTo(expectedResult));
     }
 }
 #endif

X10D.Tests/src/Core/NullableTests.cs

@@ -1,24 +1,30 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Core;
 
 namespace X10D.Tests.Core;
 
-[TestClass]
+[TestFixture]
 public class NullableTests
 {
-    [TestMethod]
+    [Test]
     public void TryGetValue_ShouldBeTrue_GivenValue()
     {
         int? value = 42;
-        Assert.IsTrue(value.TryGetValue(out int returnedValue));
-        Assert.AreEqual(value, returnedValue);
+        Assert.Multiple(() =>
+        {
+            Assert.That(value.TryGetValue(out int returnedValue));
+            Assert.That(returnedValue, Is.EqualTo(value.Value));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void TryGetValue_ShouldBeFalse_GivenNull()
     {
         int? value = null;
-        Assert.IsFalse(value.TryGetValue(out int returnedValue));
-        Assert.AreEqual(default, returnedValue);
+        Assert.Multiple(() =>
+        {
+            Assert.That(value.TryGetValue(out int returnedValue), Is.False);
+            Assert.That(returnedValue, Is.Zero);
+        });
     }
 }

X10D.Tests/src/Core/RandomTests.cs

@@ -1,121 +1,121 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Collections;
 using X10D.Core;
 
 namespace X10D.Tests.Core;
 
-[TestClass]
+[TestFixture]
 public class RandomTests
 {
-    [TestMethod]
+    [Test]
     public void NextBoolean_ShouldBeFalse_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.IsFalse(random.NextBoolean());
+        Assert.That(random.NextBoolean(), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void NextBoolean_ShouldThrow_GivenNull()
     {
-        Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextBoolean());
+        Random random = null!;
+        Assert.Throws<ArgumentNullException>(() => random.NextBoolean());
     }
 
-    [TestMethod]
+    [Test]
     public void NextByte_ShouldBe101_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(101, random.NextByte());
+        Assert.That(random.NextByte(), Is.EqualTo(101));
     }
 
-    [TestMethod]
+    [Test]
     public void NextByte_WithMax10_ShouldBe3_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(3, random.NextByte(10));
+        Assert.That(random.NextByte(10), Is.EqualTo(3));
     }
 
-    [TestMethod]
+    [Test]
     public void NextByte_WithMin0Max10_ShouldBe3_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(3, random.NextByte(0, 10));
+        Assert.That(random.NextByte(0, 10), Is.EqualTo(3));
     }
 
-    [TestMethod]
+    [Test]
     public void NextByte_ShouldThrow_GivenNull()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextByte());
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextByte(10));
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextByte(0, 10));
+        Assert.Throws<ArgumentNullException>(() => random!.NextByte());
+        Assert.Throws<ArgumentNullException>(() => random!.NextByte(10));
+        Assert.Throws<ArgumentNullException>(() => random!.NextByte(0, 10));
     }
 
-    [TestMethod]
+    [Test]
     public void NextDouble_WithMax10_ShouldBe3point9908097935797695_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(3.9908097935797695, random.NextDouble(10));
+        Assert.That(random.NextDouble(10), Is.EqualTo(3.9908097935797695));
     }
 
-    [TestMethod]
+    [Test]
     public void NextDouble_WithMin0Max10_ShouldBe3point9908097935797695_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(3.9908097935797695, random.NextDouble(0, 10));
+        Assert.That(random.NextDouble(0, 10), Is.EqualTo(3.9908097935797695));
     }
 
-    [TestMethod]
+    [Test]
     public void NextDouble_ShouldThrow_GivenNull()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextDouble(10));
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextDouble(0, 10));
+        Assert.Throws<ArgumentNullException>(() => random!.NextDouble(10));
+        Assert.Throws<ArgumentNullException>(() => random!.NextDouble(0, 10));
     }
 
-    [TestMethod]
+    [Test]
     public void NextDouble_ShouldThrow_GivenMaxLessThan0()
     {
         var random = new Random(1234);
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => random.NextDouble(-1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => random.NextDouble(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void NextDouble_ShouldThrow_GivenMaxLessThanMin()
     {
         var random = new Random(1234);
-        Assert.ThrowsException<ArgumentException>(() => random.NextDouble(0, -1));
+        Assert.Throws<ArgumentException>(() => random.NextDouble(0, -1));
     }
 
-    [TestMethod]
+    [Test]
     public void NextEnum_ShouldBeTuesday_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(DayOfWeek.Tuesday, random.Next<DayOfWeek>());
+        Assert.That(random.Next<DayOfWeek>(), Is.EqualTo(DayOfWeek.Tuesday));
     }
 
-    [TestMethod]
+    [Test]
     public void NextEnum_ShouldThrow_GivenNull()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.Next<DayOfWeek>());
+        Assert.Throws<ArgumentNullException>(() => random!.Next<DayOfWeek>());
     }
 
-    [TestMethod]
+    [Test]
     public void NextFrom_ShouldThrow_GivenNullRandom()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextFrom(""));
+        Assert.Throws<ArgumentNullException>(() => random!.NextFrom(""));
     }
 
-    [TestMethod]
+    [Test]
     public void NextFrom_ShouldThrow_GivenNullSource()
     {
         var random = new Random(1234);
-        Assert.ThrowsException<ArgumentNullException>(() => random.NextFrom((string?)null!));
+        Assert.Throws<ArgumentNullException>(() => random.NextFrom((string?)null!));
     }
 
-    [TestMethod]
+    [Test]
     public void NextFrom_ShouldEnumerate_GivenNonList()
     {
         IEnumerable<int> Source()
@@ -124,168 +124,168 @@ public class RandomTests
         }
 
         var random = new Random(1234);
-        Assert.AreEqual(0, random.NextFrom(Source()));
+        Assert.That(random.NextFrom(Source()), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void NextFromSpan_ShouldThrow_GivenNullRandom()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() =>
         {
             Span<int> span = stackalloc int[1];
-            return random!.NextFrom(span);
+            _ = random!.NextFrom(span);
         });
     }
 
-    [TestMethod]
+    [Test]
     public void NextFromReadOnlySpan_ShouldThrow_GivenNullRandom()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() =>
         {
             Span<int> span = stackalloc int[1];
-            return random!.NextFrom(span.AsReadOnly());
+            _ = random!.NextFrom(span.AsReadOnly());
         });
     }
 
-    [TestMethod]
+    [Test]
     public void NextFromSpan_ShouldReturnOnlyValue_GivenSpanWithLength1()
     {
         Span<int> span = stackalloc int[1];
         span[0] = 42;
 
         var random = new Random(1234);
-        Assert.AreEqual(42, random.NextFrom(span));
+        Assert.That(random.NextFrom(span), Is.EqualTo(42));
     }
 
-    [TestMethod]
+    [Test]
     public void NextFromReadOnlySpan_ShouldReturnOnlyValue_GivenSpanWithLength1()
     {
         Span<int> span = stackalloc int[1];
         span[0] = 42;
 
         var random = new Random(1234);
-        Assert.AreEqual(42, random.NextFrom(span.AsReadOnly()));
+        Assert.That(random.NextFrom(span.AsReadOnly()), Is.EqualTo(42));
     }
 
-    [TestMethod]
+    [Test]
     public void NextInt16_ShouldBe13076_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(13076, random.NextInt16());
+        Assert.That(random.NextInt16(), Is.EqualTo(13076));
     }
 
-    [TestMethod]
+    [Test]
     public void NextInt16_WithMax10_ShouldBe3_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(3, random.NextInt16(10));
+        Assert.That(random.NextInt16(10), Is.EqualTo(3));
     }
 
-    [TestMethod]
+    [Test]
     public void NextInt16_WithMin0Max10_ShouldBe3_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(3, random.NextInt16(0, 10));
+        Assert.That(random.NextInt16(0, 10), Is.EqualTo(3));
     }
 
-    [TestMethod]
+    [Test]
     public void NextInt16_ShouldThrow_GivenMaxLessThan0()
     {
         var random = new Random(1234);
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => random.NextInt16(-1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => random.NextInt16(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void NextInt16_ShouldThrow_GivenNull()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextInt16());
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextInt16(10));
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextInt16(0, 10));
+        Assert.Throws<ArgumentNullException>(() => random!.NextInt16());
+        Assert.Throws<ArgumentNullException>(() => random!.NextInt16(10));
+        Assert.Throws<ArgumentNullException>(() => random!.NextInt16(0, 10));
     }
 
-    [TestMethod]
+    [Test]
     public void NextSingle_WithMax10_ShouldBe3point99081_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(3.99081f, random.NextSingle(10));
+        Assert.That(random.NextSingle(10), Is.EqualTo(3.99081f));
     }
 
-    [TestMethod]
+    [Test]
     public void NextSingle_WithMin0Max10_ShouldBe3point99081_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(3.99081f, random.NextSingle(0, 10));
+        Assert.That(random.NextSingle(0, 10), Is.EqualTo(3.99081f));
     }
 
-    [TestMethod]
+    [Test]
     public void NextSingle_ShouldThrow_GivenNull()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextSingle(10));
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextSingle(0, 10));
+        Assert.Throws<ArgumentNullException>(() => random!.NextSingle(10));
+        Assert.Throws<ArgumentNullException>(() => random!.NextSingle(0, 10));
 #if !NET6_0_OR_GREATER
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextSingle());
+        Assert.Throws<ArgumentNullException>(() => random!.NextSingle());
 #endif
     }
 
-    [TestMethod]
+    [Test]
     public void NextSingle_ShouldThrow_GivenMaxLessThan0()
     {
         var random = new Random(1234);
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => random.NextSingle(-1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => random.NextSingle(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void NextSingle_ShouldThrow_GivenMaxLessThanMin()
     {
         var random = new Random(1234);
-        Assert.ThrowsException<ArgumentException>(() => random.NextSingle(0, -1));
+        Assert.Throws<ArgumentException>(() => random.NextSingle(0, -1));
     }
 
-    [TestMethod]
+    [Test]
     public void NextString_ShouldBe_kxiyiyvnqi_GivenSeed1234()
     {
         const string alphabet = "abcdefghijklmnopqrstuvwxyz";
 
         var random = new Random(1234);
-        Assert.AreEqual("kxiyiyvnqi", random.NextString(alphabet.ToCharArray(), 10));
+        Assert.That(random.NextString(alphabet.ToCharArray(), 10), Is.EqualTo("kxiyiyvnqi"));
     }
 
-    [TestMethod]
+    [Test]
     public void NextString_ShouldBeEmpty_GivenLength0()
     {
         var random = new Random(1234);
-        Assert.AreEqual(string.Empty, random.NextString(ArraySegment<char>.Empty, 0));
+        Assert.That(random.NextString(ArraySegment<char>.Empty, 0), Is.EqualTo(string.Empty));
     }
 
-    [TestMethod]
+    [Test]
     public void NextString_ShouldBeLength1_GivenLength1()
     {
         var random = new Random(1234);
-        Assert.AreEqual(1, random.NextString("hello world".ToCharArray(), 1).Length);
+        Assert.That(random.NextString("hello world".ToCharArray(), 1).Length, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void NextString_ShouldThrow_GivenNullRandom()
     {
         Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextString(ArraySegment<char>.Empty, 0));
+        Assert.Throws<ArgumentNullException>(() => random!.NextString(ArraySegment<char>.Empty, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void NextString_ShouldThrow_GivenNullSource()
     {
         var random = new Random(1234);
-        Assert.ThrowsException<ArgumentNullException>(() => random.NextString(null!, 0));
+        Assert.Throws<ArgumentNullException>(() => random.NextString(null!, 0));
     }
 
-    [TestMethod]
+    [Test]
     public void NextString_ShouldThrow_GivenNegativeLength()
     {
         var random = new Random(1234);
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => random.NextString(ArraySegment<char>.Empty, -1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => random.NextString(ArraySegment<char>.Empty, -1));
     }
 }

X10D.Tests/src/Core/SpanTest.cs

@@ -2,191 +2,203 @@
 using System.Runtime.Intrinsics.Arm;
 using System.Runtime.Intrinsics.X86;
 #endif
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Core;
 
 namespace X10D.Tests.Core;
 
-[TestClass]
+[TestFixture]
 public class SpanTest
 {
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnFalse_GivenReadOnlySpanWithNoMatchingElements_UsingByteEnum()
     {
-        ReadOnlySpan<EnumByte> span = stackalloc EnumByte[1] {EnumByte.B};
-
-        Assert.IsFalse(span.Contains(EnumByte.A));
-        Assert.IsFalse(span.Contains(EnumByte.C));
+        Assert.Multiple(() =>
+        {
+            ReadOnlySpan<EnumByte> span = stackalloc EnumByte[1] {EnumByte.B};
+            Assert.That(span.Contains(EnumByte.A), Is.False);
+            Assert.That(span.Contains(EnumByte.C), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnFalse_GivenReadOnlySpanWithNoMatchingElements_UsingInt16Enum()
     {
-        ReadOnlySpan<EnumInt16> span = stackalloc EnumInt16[1] {EnumInt16.B};
-
-        Assert.IsFalse(span.Contains(EnumInt16.A));
-        Assert.IsFalse(span.Contains(EnumInt16.C));
+        Assert.Multiple(() =>
+        {
+            ReadOnlySpan<EnumInt16> span = stackalloc EnumInt16[1] {EnumInt16.B};
+            Assert.That(span.Contains(EnumInt16.A), Is.False);
+            Assert.That(span.Contains(EnumInt16.C), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnFalse_GivenReadOnlySpanWithNoMatchingElements_UsingInt32Enum()
     {
-        ReadOnlySpan<EnumInt32> span = stackalloc EnumInt32[1] {EnumInt32.B};
-
-        Assert.IsFalse(span.Contains(EnumInt32.A));
-        Assert.IsFalse(span.Contains(EnumInt32.C));
+        Assert.Multiple(() =>
+        {
+            ReadOnlySpan<EnumInt32> span = stackalloc EnumInt32[1] {EnumInt32.B};
+            Assert.That(span.Contains(EnumInt32.A), Is.False);
+            Assert.That(span.Contains(EnumInt32.C), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnFalse_GivenReadOnlySpanWithNoMatchingElements_UsingInt64Enum()
     {
-        ReadOnlySpan<EnumInt64> span = stackalloc EnumInt64[1] {EnumInt64.B};
+        Assert.Multiple(() =>
+        {
+            ReadOnlySpan<EnumInt64> span = stackalloc EnumInt64[1] {EnumInt64.B};
 
-        Assert.IsFalse(span.Contains(EnumInt64.A));
-        Assert.IsFalse(span.Contains(EnumInt64.C));
+            Assert.That(span.Contains(EnumInt64.A), Is.False);
+            Assert.That(span.Contains(EnumInt64.C), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnTrue_GivenReadOnlySpanWithMatchingElements_UsingByteEnum()
     {
         ReadOnlySpan<EnumByte> span = stackalloc EnumByte[1] {EnumByte.B};
 
-        Assert.IsTrue(span.Contains(EnumByte.B));
+        Assert.That(span.Contains(EnumByte.B));
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnTrue_GivenReadOnlySpanWithMatchingElements_UsingInt16Enum()
     {
         ReadOnlySpan<EnumInt16> span = stackalloc EnumInt16[1] {EnumInt16.B};
 
-        Assert.IsTrue(span.Contains(EnumInt16.B));
+        Assert.That(span.Contains(EnumInt16.B));
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnTrue_GivenReadOnlySpanWithMatchingElements_UsingInt32Enum()
     {
         ReadOnlySpan<EnumInt32> span = stackalloc EnumInt32[1] {EnumInt32.B};
 
-        Assert.IsTrue(span.Contains(EnumInt32.B));
+        Assert.That(span.Contains(EnumInt32.B));
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnTrue_GivenReadOnlySpanWithMatchingElements_UsingInt64Enum()
     {
         ReadOnlySpan<EnumInt64> span = stackalloc EnumInt64[1] {EnumInt64.B};
 
-        Assert.IsTrue(span.Contains(EnumInt64.B));
+        Assert.That(span.Contains(EnumInt64.B));
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnFalse_GivenSpanWithNoMatchingElements_UsingByteEnum()
     {
-        Span<EnumByte> span = stackalloc EnumByte[1] {EnumByte.B};
+        Assert.Multiple(() =>
+        {
+            Span<EnumByte> span = stackalloc EnumByte[1] {EnumByte.B};
 
-        Assert.IsFalse(span.Contains(EnumByte.A));
-        Assert.IsFalse(span.Contains(EnumByte.C));
+            Assert.That(span.Contains(EnumByte.A), Is.False);
+            Assert.That(span.Contains(EnumByte.C), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnFalse_GivenSpanWithNoMatchingElements_UsingInt16Enum()
     {
         Span<EnumInt16> span = stackalloc EnumInt16[1] {EnumInt16.B};
 
-        Assert.IsFalse(span.Contains(EnumInt16.A));
-        Assert.IsFalse(span.Contains(EnumInt16.C));
+        Assert.That(span.Contains(EnumInt16.A), Is.False);
+        Assert.That(span.Contains(EnumInt16.C), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnFalse_GivenSpanWithNoMatchingElements_UsingInt32Enum()
     {
         Span<EnumInt32> span = stackalloc EnumInt32[1] {EnumInt32.B};
 
-        Assert.IsFalse(span.Contains(EnumInt32.A));
-        Assert.IsFalse(span.Contains(EnumInt32.C));
+        Assert.That(span.Contains(EnumInt32.A), Is.False);
+        Assert.That(span.Contains(EnumInt32.C), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnFalse_GivenSpanWithNoMatchingElements_UsingInt64Enum()
     {
         Span<EnumInt64> span = stackalloc EnumInt64[1] {EnumInt64.B};
 
-        Assert.IsFalse(span.Contains(EnumInt64.A));
-        Assert.IsFalse(span.Contains(EnumInt64.C));
+        Assert.That(span.Contains(EnumInt64.A), Is.False);
+        Assert.That(span.Contains(EnumInt64.C), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnTrue_GivenSpanWithMatchingElements_UsingByteEnum()
     {
         Span<EnumByte> span = stackalloc EnumByte[1] {EnumByte.B};
 
-        Assert.IsTrue(span.Contains(EnumByte.B));
+        Assert.That(span.Contains(EnumByte.B));
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnTrue_GivenSpanWithMatchingElements_UsingInt16Enum()
     {
         Span<EnumInt16> span = stackalloc EnumInt16[1] {EnumInt16.B};
 
-        Assert.IsTrue(span.Contains(EnumInt16.B));
+        Assert.That(span.Contains(EnumInt16.B));
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnTrue_GivenSpanWithMatchingElements_UsingInt32Enum()
     {
         Span<EnumInt32> span = stackalloc EnumInt32[1] {EnumInt32.B};
 
-        Assert.IsTrue(span.Contains(EnumInt32.B));
+        Assert.That(span.Contains(EnumInt32.B));
     }
 
-    [TestMethod]
+    [Test]
     public void Contains_ShouldReturnTrue_GivenSpanWithMatchingElements_UsingInt64Enum()
     {
         Span<EnumInt64> span = stackalloc EnumInt64[1] {EnumInt64.B};
 
-        Assert.IsTrue(span.Contains(EnumInt64.B));
+        Assert.That(span.Contains(EnumInt64.B));
     }
 
-    [TestMethod]
+    [Test]
     public void PackByte_ShouldThrowArgumentException_GivenSpanLengthGreaterThan8()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             Span<bool> span = stackalloc bool[9];
-            return span.PackByte();
+            _ = span.PackByte();
         });
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt16_ShouldThrowArgumentException_GivenSpanLengthGreaterThan16()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             Span<bool> span = stackalloc bool[17];
-            return span.PackInt16();
+            _ = span.PackInt16();
         });
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt32_ShouldThrowArgumentException_GivenSpanLengthGreaterThan32()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             Span<bool> span = stackalloc bool[33];
-            return span.PackInt32();
+            _ = span.PackInt32();
         });
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldThrowArgumentException_GivenSpanLengthGreaterThan64()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             Span<bool> span = stackalloc bool[65];
-            return span.PackInt64();
+            _ = span.PackInt64();
         });
     }
 
-    [TestMethod]
+    [Test]
     public void PackByteInternal_Fallback_ShouldReturnCorrectByte_GivenReadOnlySpan_Using()
     {
         const byte expected = 0b00110011;
@@ -194,11 +206,11 @@ public class SpanTest
 
         byte actual = span.PackByteInternal_Fallback();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
 #if NET5_0_OR_GREATER
-    [TestMethod]
+    [Test]
     public void PackByteInternal_Sse2_ShouldReturnCorrectByte_GivenReadOnlySpan_Using()
     {
         if (!Sse2.IsSupported)
@@ -211,10 +223,10 @@ public class SpanTest
 
         byte actual = span.PackByteInternal_Sse2();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackByteInternal_AdvSimd_ShouldReturnCorrectByte_GivenReadOnlySpan_Using()
     {
         if (!AdvSimd.IsSupported)
@@ -227,11 +239,11 @@ public class SpanTest
 
         byte actual = span.PackByteInternal_AdvSimd();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 #endif
 
-    [TestMethod]
+    [Test]
     public void PackInt16_ShouldReturnSameAsPackByte_WhenSpanHasLength8()
     {
         ReadOnlySpan<bool> span = stackalloc bool[8] {true, true, false, false, true, true, false, false};
@@ -239,10 +251,10 @@ public class SpanTest
         short expected = span.PackByte();
         short actual = span.PackInt16();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt16Internal_Fallback_ShouldReturnCorrectInt16_GivenReadOnlySpan()
     {
         const short expected = 0b00101101_11010100;
@@ -253,11 +265,11 @@ public class SpanTest
 
         short actual = span.PackInt16Internal_Fallback();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
 #if NET5_0_OR_GREATER
-    [TestMethod]
+    [Test]
     public void PackInt16Internal_Sse2_ShouldReturnCorrectInt16_GivenReadOnlySpan_Using()
     {
         if (!Sse2.IsSupported)
@@ -273,11 +285,11 @@ public class SpanTest
 
         short actual = span.PackInt16Internal_Sse2();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 #endif
 
-    [TestMethod]
+    [Test]
     public void PackInt32Internal_Fallback_ShouldReturnCorrectInt32_GivenReadOnlySpan()
     {
         const int expected = 0b01010101_10101010_01010101_10101010;
@@ -289,11 +301,11 @@ public class SpanTest
 
         int actual = span.PackInt32Internal_Fallback();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
 #if NET5_0_OR_GREATER
-    [TestMethod]
+    [Test]
     public void PackInt32Internal_Sse2_ShouldReturnCorrectInt32_GivenReadOnlySpan()
     {
         if (!Sse2.IsSupported)
@@ -310,10 +322,10 @@ public class SpanTest
 
         int actual = span.PackInt32Internal_Sse2();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt32Internal_Avx2_ShouldReturnCorrectInt32_GivenReadOnlySpan()
     {
         if (!Avx2.IsSupported)
@@ -330,10 +342,10 @@ public class SpanTest
 
         int actual = span.PackInt32Internal_Avx2();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt32Internal_AdvSimd_ShouldReturnCorrectInt32_GivenReadOnlySpan()
     {
         if (!AdvSimd.IsSupported)
@@ -350,11 +362,11 @@ public class SpanTest
 
         int actual = span.PackInt32Internal_AdvSimd();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 #endif
 
-    [TestMethod]
+    [Test]
     public void PackInt32_ShouldReturnSameAsPackByte_WhenSpanHasLength8_UsingReadOnlySpan()
     {
         ReadOnlySpan<bool> span = stackalloc bool[8] {true, true, false, false, true, true, false, false};
@@ -362,10 +374,10 @@ public class SpanTest
         int expected = span.PackByte();
         int actual = span.PackInt32();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt32_ShouldReturnSameAsPackByte_WhenSpanHasLength8_UsingSpan()
     {
         Span<bool> span = stackalloc bool[8] {true, true, false, false, true, true, false, false};
@@ -373,10 +385,10 @@ public class SpanTest
         int expected = span.PackByte();
         int actual = span.PackInt32();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt32_ShouldReturnSameAsPackInt16_WhenSpanHasLength16_UsingReadOnlySpan()
     {
         ReadOnlySpan<bool> span = stackalloc bool[16]
@@ -387,10 +399,10 @@ public class SpanTest
         int expected = span.PackInt16();
         int actual = span.PackInt32();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt32_ShouldReturnSameAsPackInt16_WhenSpanHasLength16_UsingSpan()
     {
         Span<bool> span = stackalloc bool[16]
@@ -401,10 +413,10 @@ public class SpanTest
         int expected = span.PackInt16();
         int actual = span.PackInt32();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldReturnCorrectInt64_GivenReadOnlySpan()
     {
         const long expected = 0b01010101_11010110_01101001_11010110_00010010_10010111_00101100_10100101;
@@ -418,10 +430,10 @@ public class SpanTest
 
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldReturnCorrectInt64_GivenSpan()
     {
         const long expected = 0b01010101_11010110_01101001_11010110_00010010_10010111_00101100_10100101;
@@ -435,10 +447,10 @@ public class SpanTest
 
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldReturnSameAsPackByte_WhenSpanHasLength8_UsingReadOnlySpan()
     {
         ReadOnlySpan<bool> span = stackalloc bool[8] {true, true, false, false, true, true, false, false};
@@ -446,10 +458,10 @@ public class SpanTest
         long expected = span.PackByte();
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldReturnSameAsPackByte_WhenSpanHasLength8_UsingSpan()
     {
         Span<bool> span = stackalloc bool[8] {true, true, false, false, true, true, false, false};
@@ -457,10 +469,10 @@ public class SpanTest
         long expected = span.PackByte();
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldReturnSameAsPackInt16_WhenSpanHasLength16_UsingReadOnlySpan()
     {
         ReadOnlySpan<bool> span = stackalloc bool[16]
@@ -471,10 +483,10 @@ public class SpanTest
         long expected = span.PackInt16();
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldReturnSameAsPackInt16_WhenSpanHasLength16_UsingSpan()
     {
         Span<bool> span = stackalloc bool[16]
@@ -485,10 +497,10 @@ public class SpanTest
         long expected = span.PackInt16();
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldReturnSameAsPackInt32_WhenSpanHasLength16_UsingReadOnlySpan()
     {
         ReadOnlySpan<bool> span = stackalloc bool[32]
@@ -500,10 +512,10 @@ public class SpanTest
         long expected = span.PackInt32();
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldReturnSameAsPackInt32_WhenSpanHasLength16_UsingSpan()
     {
         Span<bool> span = stackalloc bool[32]
@@ -515,10 +527,10 @@ public class SpanTest
         long expected = span.PackInt32();
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldFallbackAndReturnCorrectValue_GivenNonPowerOfTwoLength_UsingReadOnlySpan()
     {
         const long expected = 0b00000000_00000000_00000000_00000000_00000000_00000000_00000001_01010011;
@@ -526,10 +538,10 @@ public class SpanTest
 
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void PackInt64_ShouldFallbackAndReturnCorrectValue_GivenNonPowerOfTwoLength_UsingSpan()
     {
         const long expected = 0b00000000_00000000_00000000_00000000_00000000_00000000_00000001_01010011;
@@ -537,7 +549,7 @@ public class SpanTest
 
         long actual = span.PackInt64();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
     private enum EnumByte : byte

X10D.Tests/src/Drawing/CircleFTests.cs

@@ -1,167 +1,181 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Drawing;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
+[TestFixture]
 public class CircleFTests
 {
-    [TestMethod]
+    [Test]
     public void Area_ShouldBePiRadiusRadius_GivenUnitCircle()
     {
         var unitCircle = CircleF.Unit;
-        Assert.AreEqual(MathF.PI, unitCircle.Area);
+        Assert.That(unitCircle.Area, Is.EqualTo(MathF.PI));
     }
 
-    [TestMethod]
+    [Test]
     public void Circumference_ShouldBe2PiRadius_GivenUnitCircle()
     {
         var unitCircle = CircleF.Unit;
-        Assert.AreEqual(2 * MathF.PI, unitCircle.Circumference, 1e-6f);
+        Assert.That(unitCircle.Circumference, Is.EqualTo(2 * MathF.PI).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenUnitCircleAndEmpty()
     {
-        Assert.AreEqual(-1, CircleF.Empty.CompareTo(CircleF.Unit));
+        Assert.That(CircleF.Empty.CompareTo(CircleF.Unit), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenUnitCircleAndEmpty()
     {
-        Assert.AreEqual(1, CircleF.Unit.CompareTo(CircleF.Empty));
+        Assert.That(CircleF.Unit.CompareTo(CircleF.Empty), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyCircleAndUnitCircleAsObject()
     {
-        Assert.AreEqual(-1, CircleF.Empty.CompareTo((object)CircleF.Unit));
+        Assert.That(CircleF.Empty.CompareTo((object)CircleF.Unit), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenNull()
     {
-        Assert.AreEqual(1, CircleF.Unit.CompareTo(null));
+        Assert.That(CircleF.Unit.CompareTo(null), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeZero_GivenUnitCircle()
     {
         var unitCircle = CircleF.Unit;
-        Assert.AreEqual(0, unitCircle.CompareTo(unitCircle));
+        Assert.That(unitCircle.CompareTo(unitCircle), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldThrowArgumentException_GivenInvalidType()
     {
-        Assert.ThrowsException<ArgumentException>(() => CircleF.Unit.CompareTo(new object()));
+        Assert.Throws<ArgumentException>(() => _ = CircleF.Unit.CompareTo(new object()));
     }
 
-    [TestMethod]
+    [Test]
     public void Diameter_ShouldBe2_GivenUnitCircle()
     {
-        Assert.AreEqual(2.0f, CircleF.Unit.Diameter, 1e-6f);
+        Assert.That(CircleF.Unit.Diameter, Is.EqualTo(2.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoUnitCircles()
     {
         var unitCircle1 = CircleF.Unit;
         var unitCircle2 = CircleF.Unit;
-        Assert.AreEqual(unitCircle1, unitCircle2);
-        Assert.IsTrue(unitCircle1 == unitCircle2);
-        Assert.IsFalse(unitCircle1 != unitCircle2);
+        Assert.Multiple(() =>
+        {
+            Assert.That(unitCircle2, Is.EqualTo(unitCircle1));
+            Assert.That(unitCircle1, Is.EqualTo(unitCircle2));
+            Assert.That(unitCircle1 == unitCircle2);
+            Assert.That(unitCircle2 == unitCircle1);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenUnitCirclesAsObjects()
     {
         CircleF unitCircle1 = CircleF.Unit;
         object unitCircle2 = CircleF.Unit;
-        Assert.AreEqual(unitCircle1, unitCircle2);
-        Assert.IsTrue(unitCircle1.Equals(unitCircle2));
+        Assert.Multiple(() =>
+        {
+            Assert.That(unitCircle2, Is.EqualTo(unitCircle1));
+            Assert.That(unitCircle1, Is.EqualTo(unitCircle2));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentCircles()
     {
-        Assert.AreNotEqual(CircleF.Unit, CircleF.Empty);
-        Assert.IsFalse(CircleF.Unit == CircleF.Empty);
-        Assert.IsTrue(CircleF.Unit != CircleF.Empty);
+        Assert.Multiple(() =>
+        {
+            Assert.That(CircleF.Empty, Is.Not.EqualTo(CircleF.Unit));
+            Assert.That(CircleF.Unit, Is.Not.EqualTo(CircleF.Empty));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.AreNotEqual((object?)null, CircleF.Empty);
-        Assert.IsFalse(CircleF.Empty.Equals(null));
+        Assert.That(CircleF.Empty, Is.Not.EqualTo(null));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = CircleF.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, CircleF.Empty.GetHashCode());
+        Assert.That(CircleF.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenUnitCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = CircleF.Unit.GetHashCode();
-        Assert.AreEqual(hashCode, CircleF.Unit.GetHashCode());
+        Assert.That(CircleF.Unit.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void op_Explicit_ShouldReturnEquivalentCircle_GivenCircle()
     {
         CircleF unitCircle = CircleF.Unit;
         Circle converted = (Circle)unitCircle;
 
-        Assert.AreEqual(unitCircle, converted);
-        Assert.AreEqual(unitCircle.Radius, converted.Radius);
-        Assert.AreEqual(unitCircle.Center, converted.Center);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((Circle)unitCircle));
+            Assert.That(converted.Radius, Is.EqualTo(unitCircle.Radius));
+            Assert.That((PointF)converted.Center, Is.EqualTo(unitCircle.Center));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_GreaterThan_True_GivenUnitAndEmptyCircle()
     {
-        Assert.IsTrue(CircleF.Unit > CircleF.Empty);
-        Assert.IsTrue(CircleF.Unit >= CircleF.Empty);
-        Assert.IsFalse(CircleF.Unit < CircleF.Empty);
-        Assert.IsFalse(CircleF.Unit <= CircleF.Empty);
+        Assert.That(CircleF.Unit, Is.GreaterThan(CircleF.Empty));
+        Assert.That(CircleF.Unit, Is.GreaterThanOrEqualTo(CircleF.Empty));
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentCircle_GivenCircle()
     {
         Circle unitCircle = Circle.Unit;
         CircleF converted = unitCircle;
 
-        Assert.AreEqual(unitCircle, converted);
-        Assert.AreEqual(unitCircle.Radius, converted.Radius);
-        Assert.AreEqual(unitCircle.Center, converted.Center);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((CircleF)unitCircle));
+            Assert.That(converted.Radius, Is.EqualTo(unitCircle.Radius));
+            Assert.That(converted.Center, Is.EqualTo((PointF)unitCircle.Center));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_LessThan_True_GivenEmptyAndUnitCircle()
     {
-        Assert.IsTrue(CircleF.Empty < CircleF.Unit);
-        Assert.IsTrue(CircleF.Empty <= CircleF.Unit);
-        Assert.IsFalse(CircleF.Empty > CircleF.Unit);
-        Assert.IsFalse(CircleF.Empty >= CircleF.Unit);
+        Assert.Multiple(() =>
+        {
+            Assert.That(CircleF.Empty, Is.LessThan(CircleF.Unit));
+            Assert.That(CircleF.Empty, Is.LessThanOrEqualTo(CircleF.Unit));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Radius_ShouldBe0_GivenEmptyCircle()
     {
-        Assert.AreEqual(0.0f, CircleF.Empty.Radius, 1e-6f);
+        Assert.That(CircleF.Empty.Radius, Is.EqualTo(0.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Radius_ShouldBe1_GivenUnitCircle()
     {
-        Assert.AreEqual(1.0f, CircleF.Unit.Radius, 1e-6f);
+        Assert.That(CircleF.Unit.Radius, Is.EqualTo(1.0f).Within(1e-6f));
     }
 }

X10D.Tests/src/Drawing/CircleTests.cs

@@ -1,145 +1,147 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
+[TestFixture]
 public class CircleTests
 {
-    [TestMethod]
+    [Test]
     public void Area_ShouldBePiRadiusRadius_GivenUnitCircle()
     {
         var unitCircle = Circle.Unit;
-        Assert.AreEqual(MathF.PI * unitCircle.Radius * unitCircle.Radius, unitCircle.Area);
+        Assert.That(unitCircle.Area, Is.EqualTo(MathF.PI * unitCircle.Radius * unitCircle.Radius));
     }
 
-    [TestMethod]
+    [Test]
     public void Circumference_ShouldBe2PiRadius_GivenUnitCircle()
     {
         var unitCircle = Circle.Unit;
-        Assert.AreEqual(2.0f * MathF.PI * unitCircle.Radius, unitCircle.Circumference, 1e-6f);
+        Assert.That(unitCircle.Circumference, Is.EqualTo(2.0f * MathF.PI * unitCircle.Radius).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenUnitCircleAndEmpty()
     {
-        Assert.AreEqual(-1, Circle.Empty.CompareTo(Circle.Unit));
+        Assert.That(Circle.Empty.CompareTo(Circle.Unit), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenUnitCircleAndEmpty()
     {
-        Assert.AreEqual(1, Circle.Unit.CompareTo(Circle.Empty));
+        Assert.That(Circle.Unit.CompareTo(Circle.Empty), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyCircleAndUnitCircleAsObject()
     {
-        Assert.AreEqual(-1, Circle.Empty.CompareTo((object)Circle.Unit));
+        Assert.That(Circle.Empty.CompareTo((object)Circle.Unit), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenNull()
     {
-        Assert.AreEqual(1, Circle.Unit.CompareTo(null));
+        Assert.That(Circle.Unit.CompareTo(null), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeZero_GivenUnitCircle()
     {
         var unitCircle = Circle.Unit;
-        Assert.AreEqual(0, unitCircle.CompareTo(unitCircle));
+        Assert.That(unitCircle.CompareTo(unitCircle), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldThrowArgumentException_GivenInvalidType()
     {
-        Assert.ThrowsException<ArgumentException>(() => Circle.Unit.CompareTo(new object()));
+        Assert.Throws<ArgumentException>(() => _ = Circle.Unit.CompareTo(new object()));
     }
 
-    [TestMethod]
+    [Test]
     public void Diameter_ShouldBe2_GivenUnitCircle()
     {
-        Assert.AreEqual(2.0f, Circle.Unit.Diameter, 1e-6f);
+        Assert.That(Circle.Unit.Diameter, Is.EqualTo(2.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoUnitCircles()
     {
         var unitCircle1 = Circle.Unit;
         var unitCircle2 = Circle.Unit;
-        Assert.AreEqual(unitCircle1, unitCircle2);
-        Assert.IsTrue(unitCircle1 == unitCircle2);
-        Assert.IsFalse(unitCircle1 != unitCircle2);
+        Assert.Multiple(() =>
+        {
+            Assert.That(unitCircle2, Is.EqualTo(unitCircle1));
+            Assert.That(unitCircle1, Is.EqualTo(unitCircle2));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenUnitCirclesAsObjects()
     {
         Circle unitCircle1 = Circle.Unit;
         object unitCircle2 = Circle.Unit;
-        Assert.AreEqual(unitCircle1, unitCircle2);
-        Assert.IsTrue(unitCircle1.Equals(unitCircle2));
+        Assert.Multiple(() =>
+        {
+            Assert.That(unitCircle2, Is.EqualTo(unitCircle1));
+            Assert.That(unitCircle1, Is.EqualTo(unitCircle2));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentCircles()
     {
-        Assert.AreNotEqual(Circle.Unit, Circle.Empty);
-        Assert.IsFalse(Circle.Unit == Circle.Empty);
-        Assert.IsTrue(Circle.Unit != Circle.Empty);
+        Assert.Multiple(() =>
+        {
+            Assert.That(Circle.Empty, Is.Not.EqualTo(Circle.Unit));
+            Assert.That(Circle.Unit, Is.Not.EqualTo(Circle.Empty));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.AreNotEqual((object?)null, Circle.Empty);
-        Assert.IsFalse(Circle.Empty.Equals(null));
+        Assert.That(Circle.Empty, Is.Not.EqualTo(null));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Circle.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, Circle.Empty.GetHashCode());
+        Assert.That(Circle.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenUnitCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Circle.Unit.GetHashCode();
-        Assert.AreEqual(hashCode, Circle.Unit.GetHashCode());
+        Assert.That(Circle.Unit.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void op_GreaterThan_True_GivenUnitAndEmptyCircle()
     {
-        Assert.IsTrue(Circle.Unit > Circle.Empty);
-        Assert.IsTrue(Circle.Unit >= Circle.Empty);
-        Assert.IsFalse(Circle.Unit < Circle.Empty);
-        Assert.IsFalse(Circle.Unit <= Circle.Empty);
+        Assert.That(Circle.Unit, Is.GreaterThan(Circle.Empty));
+        Assert.That(Circle.Unit, Is.GreaterThanOrEqualTo(Circle.Empty));
     }
 
-    [TestMethod]
+    [Test]
     public void op_LessThan_True_GivenEmptyAndUnitCircle()
     {
-        Assert.IsTrue(Circle.Empty < Circle.Unit);
-        Assert.IsTrue(Circle.Empty <= Circle.Unit);
-        Assert.IsFalse(Circle.Empty > Circle.Unit);
-        Assert.IsFalse(Circle.Empty >= Circle.Unit);
+        Assert.That(Circle.Empty, Is.LessThan(Circle.Unit));
+        Assert.That(Circle.Empty, Is.LessThanOrEqualTo(Circle.Unit));
     }
 
-    [TestMethod]
+    [Test]
     public void Radius_ShouldBe0_GivenEmptyCircle()
     {
-        Assert.AreEqual(0, Circle.Empty.Radius);
+        Assert.That(Circle.Empty.Radius, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Radius_ShouldBe1_GivenUnitCircle()
     {
-        Assert.AreEqual(1, Circle.Unit.Radius);
+        Assert.That(Circle.Unit.Radius, Is.EqualTo(1));
     }
 }

X10D.Tests/src/Drawing/ColorTests.cs

@@ -1,10 +1,10 @@
 using System.Drawing;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
+[TestFixture]
 public class ColorTests
 {
     private static readonly Color Black = Color.FromArgb(0, 0, 0);
@@ -16,251 +16,278 @@ public class ColorTests
     private static readonly Color Magenta = Color.FromArgb(255, 0, 255);
     private static readonly Color Yellow = Color.FromArgb(255, 255, 0);
 
-    [TestMethod]
+    [Test]
     public void Deconstruct_ShouldDeconstructColor_GivenColor()
     {
         (byte r, byte g, byte b) = Black;
-        Assert.AreEqual(0, r);
-        Assert.AreEqual(0, g);
-        Assert.AreEqual(0, b);
+        Assert.Multiple(() =>
+        {
+            Assert.That(r, Is.Zero);
+            Assert.That(g, Is.Zero);
+            Assert.That(b, Is.Zero);
+        });
 
         (byte a, r, g, b) = Black;
-        Assert.AreEqual(255, a);
-        Assert.AreEqual(0, r);
-        Assert.AreEqual(0, g);
-        Assert.AreEqual(0, b);
+        Assert.Multiple(() =>
+        {
+            Assert.That(a, Is.EqualTo(255));
+            Assert.That(r, Is.Zero);
+            Assert.That(g, Is.Zero);
+            Assert.That(b, Is.Zero);
+        });
 
         (r, g, b) = Red;
-        Assert.AreEqual(255, r);
-        Assert.AreEqual(0, g);
-        Assert.AreEqual(0, b);
+        Assert.Multiple(() =>
+        {
+            Assert.That(r, Is.EqualTo(255));
+            Assert.That(g, Is.Zero);
+            Assert.That(b, Is.Zero);
+        });
 
         (a, r, g, b) = Red;
-        Assert.AreEqual(255, a);
-        Assert.AreEqual(255, r);
-        Assert.AreEqual(0, g);
-        Assert.AreEqual(0, b);
+        Assert.Multiple(() =>
+        {
+            Assert.That(a, Is.EqualTo(255));
+            Assert.That(r, Is.EqualTo(255));
+            Assert.That(g, Is.Zero);
+            Assert.That(b, Is.Zero);
+        });
 
         (r, g, b) = Green;
-        Assert.AreEqual(0, r);
-        Assert.AreEqual(255, g);
-        Assert.AreEqual(0, b);
+        Assert.Multiple(() =>
+        {
+            Assert.That(r, Is.Zero);
+            Assert.That(g, Is.EqualTo(255));
+            Assert.That(b, Is.Zero);
+        });
 
         (a, r, g, b) = Green;
-        Assert.AreEqual(255, a);
-        Assert.AreEqual(0, r);
-        Assert.AreEqual(255, g);
-        Assert.AreEqual(0, b);
+        Assert.Multiple(() =>
+        {
+            Assert.That(a, Is.EqualTo(255));
+            Assert.That(r, Is.Zero);
+            Assert.That(g, Is.EqualTo(255));
+            Assert.That(b, Is.Zero);
+        });
 
         (r, g, b) = Blue;
-        Assert.AreEqual(0, r);
-        Assert.AreEqual(0, g);
-        Assert.AreEqual(255, b);
+        Assert.Multiple(() =>
+        {
+            Assert.That(r, Is.Zero);
+            Assert.That(g, Is.Zero);
+            Assert.That(b, Is.EqualTo(255));
+        });
 
         (a, r, g, b) = Blue;
-        Assert.AreEqual(255, a);
-        Assert.AreEqual(0, r);
-        Assert.AreEqual(0, g);
-        Assert.AreEqual(255, b);
+        Assert.Multiple(() =>
+        {
+            Assert.That(a, Is.EqualTo(255));
+            Assert.That(r, Is.Zero);
+            Assert.That(g, Is.Zero);
+            Assert.That(b, Is.EqualTo(255));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void GetClosestConsoleColor_ShouldReturnClosestColor_GivenValidColor()
     {
-        Assert.AreEqual(ConsoleColor.White, Color.Transparent.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.AliceBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.AntiqueWhite.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Cyan, Color.Aqua.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Aquamarine.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Azure.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Beige.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Bisque.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Black, Color.Black.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.BlanchedAlmond.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Blue, Color.Blue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkMagenta, Color.BlueViolet.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkRed, Color.Brown.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.BurlyWood.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.CadetBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Yellow, Color.Chartreuse.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.Chocolate.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.Coral.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.CornflowerBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Cornsilk.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Red, Color.Crimson.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Cyan, Color.Cyan.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkBlue, Color.DarkBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkCyan, Color.DarkCyan.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.DarkGoldenrod.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.DarkGray.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGreen, Color.DarkGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.DarkKhaki.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkMagenta, Color.DarkMagenta.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.DarkOliveGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.DarkOrange.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkMagenta, Color.DarkOrchid.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkRed, Color.DarkRed.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.DarkSalmon.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.DarkSeaGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.DarkSlateBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGreen, Color.DarkSlateGray.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Cyan, Color.DarkTurquoise.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkMagenta, Color.DarkViolet.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Magenta, Color.DeepPink.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Cyan, Color.DeepSkyBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.DimGray.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Cyan, Color.DodgerBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkRed, Color.Firebrick.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.FloralWhite.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Green, Color.ForestGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Magenta, Color.Fuchsia.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Gainsboro.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.GhostWhite.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Yellow, Color.Gold.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.Goldenrod.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.Gray.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Green, Color.Green.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Yellow, Color.GreenYellow.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Honeydew.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.HotPink.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.IndianRed.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkMagenta, Color.Indigo.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Ivory.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Khaki.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Lavender.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.LavenderBlush.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Yellow, Color.LawnGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.LemonChiffon.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.LightBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.LightCoral.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.LightCyan.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.LightGoldenrodYellow.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.LightGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.LightGray.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.LightPink.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.LightSalmon.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkCyan, Color.LightSeaGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.LightSkyBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.LightSlateGray.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.LightSteelBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.LightYellow.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Green, Color.Lime.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Green, Color.LimeGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Linen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Magenta, Color.Magenta.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkRed, Color.Maroon.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.MediumAquamarine.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Blue, Color.MediumBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.MediumOrchid.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.MediumPurple.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkCyan, Color.MediumSeaGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.MediumSlateBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Cyan, Color.MediumSpringGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Cyan, Color.MediumTurquoise.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkMagenta, Color.MediumVioletRed.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkBlue, Color.MidnightBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.MintCream.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.MistyRose.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Moccasin.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.NavajoWhite.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkBlue, Color.Navy.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.OldLace.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.Olive.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.OliveDrab.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.Orange.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Red, Color.OrangeRed.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Orchid.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.PaleGoldenrod.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.PaleGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.PaleTurquoise.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.PaleVioletRed.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.PapayaWhip.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.PeachPuff.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.Peru.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Pink.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Plum.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.PowderBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkMagenta, Color.Purple.GetClosestConsoleColor());
+        Assert.Multiple(() =>
+        {
+            Assert.That(Color.Transparent.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.AliceBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.AntiqueWhite.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Aqua.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Cyan));
+            Assert.That(Color.Aquamarine.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.Azure.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Beige.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Bisque.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Black.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Black));
+            Assert.That(Color.BlanchedAlmond.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Blue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Blue));
+            Assert.That(Color.BlueViolet.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkMagenta));
+            Assert.That(Color.Brown.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkRed));
+            Assert.That(Color.BurlyWood.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.CadetBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.Chartreuse.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Yellow));
+            Assert.That(Color.Chocolate.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.Coral.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.CornflowerBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.Cornsilk.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Crimson.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Red));
+            Assert.That(Color.Cyan.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Cyan));
+            Assert.That(Color.DarkBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkBlue));
+            Assert.That(Color.DarkCyan.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkCyan));
+            Assert.That(Color.DarkGoldenrod.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.DarkGray.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.DarkGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGreen));
+            Assert.That(Color.DarkKhaki.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.DarkMagenta.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkMagenta));
+            Assert.That(Color.DarkOliveGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.DarkOrange.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.DarkOrchid.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkMagenta));
+            Assert.That(Color.DarkRed.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkRed));
+            Assert.That(Color.DarkSalmon.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.DarkSeaGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.DarkSlateBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.DarkSlateGray.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGreen));
+            Assert.That(Color.DarkTurquoise.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Cyan));
+            Assert.That(Color.DarkViolet.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkMagenta));
+            Assert.That(Color.DeepPink.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Magenta));
+            Assert.That(Color.DeepSkyBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Cyan));
+            Assert.That(Color.DimGray.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.DodgerBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Cyan));
+            Assert.That(Color.Firebrick.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkRed));
+            Assert.That(Color.FloralWhite.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.ForestGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Green));
+            Assert.That(Color.Fuchsia.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Magenta));
+            Assert.That(Color.Gainsboro.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.GhostWhite.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Gold.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Yellow));
+            Assert.That(Color.Goldenrod.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.Gray.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.Green.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Green));
+            Assert.That(Color.GreenYellow.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Yellow));
+            Assert.That(Color.Honeydew.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.HotPink.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.IndianRed.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.Indigo.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkMagenta));
+            Assert.That(Color.Ivory.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Khaki.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.Lavender.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.LavenderBlush.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.LawnGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Yellow));
+            Assert.That(Color.LemonChiffon.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.LightBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.LightCoral.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.LightCyan.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.LightGoldenrodYellow.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.LightGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.LightGray.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.LightPink.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.LightSalmon.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.LightSeaGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkCyan));
+            Assert.That(Color.LightSkyBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.LightSlateGray.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.LightSteelBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.LightYellow.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Lime.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Green));
+            Assert.That(Color.LimeGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Green));
+            Assert.That(Color.Linen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Magenta.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Magenta));
+            Assert.That(Color.Maroon.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkRed));
+            Assert.That(Color.MediumAquamarine.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.MediumBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Blue));
+            Assert.That(Color.MediumOrchid.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.MediumPurple.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.MediumSeaGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkCyan));
+            Assert.That(Color.MediumSlateBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.MediumSpringGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Cyan));
+            Assert.That(Color.MediumTurquoise.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Cyan));
+            Assert.That(Color.MediumVioletRed.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkMagenta));
+            Assert.That(Color.MidnightBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkBlue));
+            Assert.That(Color.MintCream.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.MistyRose.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Moccasin.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.NavajoWhite.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Navy.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkBlue));
+            Assert.That(Color.OldLace.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Olive.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.OliveDrab.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.Orange.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.OrangeRed.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Red));
+            Assert.That(Color.Orchid.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.PaleGoldenrod.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.PaleGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.PaleTurquoise.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.PaleVioletRed.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.PapayaWhip.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.PeachPuff.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Peru.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.Pink.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Plum.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.PowderBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.Purple.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkMagenta));
 #if NET6_0_OR_GREATER
-        Assert.AreEqual(ConsoleColor.DarkMagenta, Color.RebeccaPurple.GetClosestConsoleColor());
+            Assert.That(Color.RebeccaPurple.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkMagenta));
 #endif
-        Assert.AreEqual(ConsoleColor.Red, Color.Red.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.RosyBrown.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkCyan, Color.RoyalBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkRed, Color.SaddleBrown.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Salmon.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.SandyBrown.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkCyan, Color.SeaGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.SeaShell.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkRed, Color.Sienna.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Silver.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.SkyBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.SlateBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.SlateGray.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Snow.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkCyan, Color.SpringGreen.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.SteelBlue.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Tan.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkCyan, Color.Teal.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Thistle.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkYellow, Color.Tomato.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Cyan, Color.Turquoise.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.DarkGray, Color.Violet.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.Wheat.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.White.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.White, Color.WhiteSmoke.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Yellow, Color.Yellow.GetClosestConsoleColor());
-        Assert.AreEqual(ConsoleColor.Gray, Color.YellowGreen.GetClosestConsoleColor());
+            Assert.That(Color.Red.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Red));
+            Assert.That(Color.RosyBrown.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.RoyalBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkCyan));
+            Assert.That(Color.SaddleBrown.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkRed));
+            Assert.That(Color.Salmon.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.SandyBrown.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.SeaGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkCyan));
+            Assert.That(Color.SeaShell.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Sienna.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkRed));
+            Assert.That(Color.Silver.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.SkyBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.SlateBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.SlateGray.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.Snow.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.SpringGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkCyan));
+            Assert.That(Color.SteelBlue.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+            Assert.That(Color.Tan.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.Teal.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkCyan));
+            Assert.That(Color.Thistle.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.Tomato.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkYellow));
+            Assert.That(Color.Turquoise.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Cyan));
+            Assert.That(Color.Violet.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.DarkGray));
+            Assert.That(Color.Wheat.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.White.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.WhiteSmoke.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.White));
+            Assert.That(Color.Yellow.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Yellow));
+            Assert.That(Color.YellowGreen.GetClosestConsoleColor(), Is.EqualTo(ConsoleColor.Gray));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Inverted_ShouldReturnInvertedColor()
     {
-        Assert.AreEqual(White, Black.Inverted());
-        Assert.AreEqual(Black, White.Inverted());
-        Assert.AreEqual(Red, Cyan.Inverted());
-        Assert.AreEqual(Cyan, Red.Inverted());
-        Assert.AreEqual(Green, Magenta.Inverted());
-        Assert.AreEqual(Magenta, Green.Inverted());
-        Assert.AreEqual(Yellow, Blue.Inverted());
-        Assert.AreEqual(Blue, Yellow.Inverted());
+        Assert.That(Black.Inverted(), Is.EqualTo(White));
+        Assert.That(White.Inverted(), Is.EqualTo(Black));
+        Assert.That(Cyan.Inverted(), Is.EqualTo(Red));
+        Assert.That(Red.Inverted(), Is.EqualTo(Cyan));
+        Assert.That(Magenta.Inverted(), Is.EqualTo(Green));
+        Assert.That(Green.Inverted(), Is.EqualTo(Magenta));
+        Assert.That(Blue.Inverted(), Is.EqualTo(Yellow));
+        Assert.That(Yellow.Inverted(), Is.EqualTo(Blue));
     }
 
-    [TestMethod]
+    [Test]
     public void Inverted_ShouldIgnoreAlpha()
     {
         Color expected = Color.FromArgb(255, 0, 0, 0);
         Color actual = Color.FromArgb(255, 255, 255, 255).Inverted();
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void WithA0_ShouldReturnSameColor_GivenWhite()
     {
         Color transparent = Color.FromArgb(0, 255, 255, 255);
-        Assert.AreEqual(transparent, White.WithA(0));
-        Assert.AreEqual(transparent, transparent.WithA(0));
+        Assert.That(White.WithA(0), Is.EqualTo(transparent));
+        Assert.That(transparent.WithA(0), Is.EqualTo(transparent));
     }
 
-    [TestMethod]
+    [Test]
     public void WithB0_ShouldReturnYellow_GivenWhite()
     {
-        Assert.AreEqual(Yellow, White.WithB(0));
-        Assert.AreEqual(Yellow, Yellow.WithB(0));
+        Assert.That(White.WithB(0), Is.EqualTo(Yellow));
+        Assert.That(Yellow.WithB(0), Is.EqualTo(Yellow));
     }
 
-    [TestMethod]
+    [Test]
     public void WithG0_ShouldReturnMagenta_GivenWhite()
     {
-        Assert.AreEqual(Magenta, White.WithG(0));
-        Assert.AreEqual(Magenta, Magenta.WithG(0));
+        Assert.That(White.WithG(0), Is.EqualTo(Magenta));
+        Assert.That(Magenta.WithG(0), Is.EqualTo(Magenta));
     }
 
-    [TestMethod]
+    [Test]
     public void WithR0_ShouldReturnCyan_GivenWhite()
     {
-        Assert.AreEqual(Cyan, White.WithR(0));
-        Assert.AreEqual(Cyan, Cyan.WithR(0));
+        Assert.That(White.WithR(0), Is.EqualTo(Cyan));
+        Assert.That(Cyan.WithR(0), Is.EqualTo(Cyan));
     }
 }

X10D.Tests/src/Drawing/CuboidTests.cs

@@ -1,82 +1,79 @@
 using System.Numerics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
+[TestFixture]
 public class CuboidTests
 {
-    [TestMethod]
+    [Test]
     public void Corners_ShouldBeCorrect_GivenCubeOfSize1()
     {
         Cuboid cube = Cuboid.Cube;
 
-        Assert.AreEqual(new Vector3(0.5f, 0.5f, -0.5f), cube.FrontTopRight);
-        Assert.AreEqual(new Vector3(-0.5f, 0.5f, -0.5f), cube.FrontTopLeft);
-        Assert.AreEqual(new Vector3(0.5f, -0.5f, -0.5f), cube.FrontBottomRight);
-        Assert.AreEqual(new Vector3(-0.5f, -0.5f, -0.5f), cube.FrontBottomLeft);
-        Assert.AreEqual(new Vector3(0.5f, 0.5f, 0.5f), cube.BackTopRight);
-        Assert.AreEqual(new Vector3(-0.5f, 0.5f, 0.5f), cube.BackTopLeft);
-        Assert.AreEqual(new Vector3(0.5f, -0.5f, 0.5f), cube.BackBottomRight);
-        Assert.AreEqual(new Vector3(-0.5f, -0.5f, 0.5f), cube.BackBottomLeft);
+        Assert.That(cube.FrontTopRight, Is.EqualTo(new Vector3(0.5f, 0.5f, -0.5f)));
+        Assert.That(cube.FrontTopLeft, Is.EqualTo(new Vector3(-0.5f, 0.5f, -0.5f)));
+        Assert.That(cube.FrontBottomRight, Is.EqualTo(new Vector3(0.5f, -0.5f, -0.5f)));
+        Assert.That(cube.FrontBottomLeft, Is.EqualTo(new Vector3(-0.5f, -0.5f, -0.5f)));
+        Assert.That(cube.BackTopRight, Is.EqualTo(new Vector3(0.5f, 0.5f, 0.5f)));
+        Assert.That(cube.BackTopLeft, Is.EqualTo(new Vector3(-0.5f, 0.5f, 0.5f)));
+        Assert.That(cube.BackBottomRight, Is.EqualTo(new Vector3(0.5f, -0.5f, 0.5f)));
+        Assert.That(cube.BackBottomLeft, Is.EqualTo(new Vector3(-0.5f, -0.5f, 0.5f)));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoCubesOfSize1()
     {
         var cube1 = Cuboid.Cube;
         var cube2 = Cuboid.Cube;
-        Assert.AreEqual(cube1, cube2);
-        Assert.IsTrue(cube1 == cube2);
-        Assert.IsFalse(cube1 != cube2);
+        Assert.That(cube1, Is.EqualTo(cube2));
+        Assert.That(cube2, Is.EqualTo(cube1));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentCubes()
     {
-        Assert.AreNotEqual(Cuboid.Cube, Cuboid.Empty);
-        Assert.IsFalse(Cuboid.Cube == Cuboid.Empty);
-        Assert.IsTrue(Cuboid.Cube != Cuboid.Empty);
+        Assert.That(Cuboid.Empty, Is.Not.EqualTo(Cuboid.Cube));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.IsFalse(Cuboid.Cube.Equals(null));
+        Assert.That(Cuboid.Cube.Equals(null), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Cuboid.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, Cuboid.Empty.GetHashCode());
+        Assert.That(Cuboid.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenCubeOfSize1()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Cuboid.Cube.GetHashCode();
-        Assert.AreEqual(hashCode, Cuboid.Cube.GetHashCode());
+        Assert.That(Cuboid.Cube.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void Size_ShouldBeOne_GivenCubeOfSize1()
     {
-        Assert.AreEqual(Vector3.One, Cuboid.Cube.Size);
+        Assert.That(Cuboid.Cube.Size, Is.EqualTo(Vector3.One));
     }
 
-    [TestMethod]
+    [Test]
     public void Size_ShouldBeOne_GivenRotatedCube()
     {
-        Assert.AreEqual(Vector3.One, new Cuboid(0, 0, 0, 1, 1, 1, 90, 0, 0).Size);
+        Assert.That(new Cuboid(0, 0, 0, 1, 1, 1, 90, 0, 0).Size, Is.EqualTo(Vector3.One));
     }
 
-    [TestMethod]
+    [Test]
     public void Volume_ShouldBe1_GivenCubeOfSize1()
     {
-        Assert.AreEqual(1.0f, Cuboid.Cube.Volume, 1e-6f);
+        Assert.That(Cuboid.Cube.Volume, Is.EqualTo(1.0f).Within(1e-6f));
     }
 }

X10D.Tests/src/Drawing/EllipseFTests.cs

@@ -1,156 +1,165 @@
 using System.Drawing;
 using System.Numerics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
+[TestFixture]
 public class EllipseFTests
 {
-    [TestMethod]
+    [Test]
     public void Area_ShouldBePiRadiusRadius_GivenUnitEllipse()
     {
         var unitEllipse = EllipseF.Unit;
-        Assert.AreEqual(MathF.PI, unitEllipse.Area, 1e-6f);
+        Assert.That(unitEllipse.Area, Is.EqualTo(MathF.PI).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void ApproximateCircumference_ShouldBe2PiRadius_GivenUnitEllipse()
     {
         var unitEllipse = EllipseF.Unit;
-        Assert.AreEqual(2 * MathF.PI, unitEllipse.ApproximateCircumference, 1e-6f);
+        Assert.That(unitEllipse.ApproximateCircumference, Is.EqualTo(2 * MathF.PI).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldGiveCorrectEllipse()
     {
         var ellipse = new EllipseF(PointF.Empty, new SizeF(2, 1));
-        Assert.AreEqual(new PointF(0, 0), ellipse.Center);
-        Assert.AreEqual(new SizeF(2, 1), ellipse.Radius);
+        Assert.That(ellipse.Center, Is.EqualTo(new PointF(0, 0)));
+        Assert.That(ellipse.Radius, Is.EqualTo(new SizeF(2, 1)));
 
         ellipse = new EllipseF(0, 0, 2, 1);
-        Assert.AreEqual(new PointF(0, 0), ellipse.Center);
-        Assert.AreEqual(new SizeF(2, 1), ellipse.Radius);
+        Assert.That(ellipse.Center, Is.EqualTo(new PointF(0, 0)));
+        Assert.That(ellipse.Radius, Is.EqualTo(new SizeF(2, 1)));
 
         ellipse = new EllipseF(PointF.Empty, new Vector2(2, 1));
-        Assert.AreEqual(new PointF(0, 0), ellipse.Center);
-        Assert.AreEqual(new SizeF(2, 1), ellipse.Radius);
+        Assert.That(ellipse.Center, Is.EqualTo(new PointF(0, 0)));
+        Assert.That(ellipse.Radius, Is.EqualTo(new SizeF(2, 1)));
 
         ellipse = new EllipseF(Vector2.Zero, new Vector2(2, 1));
-        Assert.AreEqual(new PointF(0, 0), ellipse.Center);
-        Assert.AreEqual(new SizeF(2, 1), ellipse.Radius);
+        Assert.That(ellipse.Center, Is.EqualTo(new PointF(0, 0)));
+        Assert.That(ellipse.Radius, Is.EqualTo(new SizeF(2, 1)));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoUnitEllipses()
     {
         var unitEllipse1 = EllipseF.Unit;
         var unitEllipse2 = EllipseF.Unit;
-        Assert.AreEqual(unitEllipse1, unitEllipse2);
-        Assert.IsTrue(unitEllipse1 == unitEllipse2);
-        Assert.IsFalse(unitEllipse1 != unitEllipse2);
+        Assert.That(unitEllipse2, Is.EqualTo(unitEllipse1));
+        Assert.That(unitEllipse1, Is.EqualTo(unitEllipse2));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentEllipses()
     {
-        Assert.AreNotEqual(EllipseF.Unit, EllipseF.Empty);
-        Assert.IsFalse(EllipseF.Unit == EllipseF.Empty);
-        Assert.IsTrue(EllipseF.Unit != EllipseF.Empty);
+        Assert.That(EllipseF.Empty, Is.Not.EqualTo(EllipseF.Unit));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.IsFalse(EllipseF.Unit.Equals(null));
+        Assert.That(EllipseF.Unit, Is.Not.EqualTo(null));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyEllipse()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = EllipseF.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, EllipseF.Empty.GetHashCode());
+        Assert.That(EllipseF.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenUnitEllipse()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = EllipseF.Unit.GetHashCode();
-        Assert.AreEqual(hashCode, EllipseF.Unit.GetHashCode());
+        Assert.That(EllipseF.Unit.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void HorizontalRadius_ShouldBe0_GivenEmptyEllipse()
     {
-        Assert.AreEqual(0, EllipseF.Empty.HorizontalRadius);
+        Assert.That(EllipseF.Empty.HorizontalRadius, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void HorizontalRadius_ShouldBe1_GivenUnitEllipse()
     {
-        Assert.AreEqual(1, EllipseF.Unit.HorizontalRadius);
+        Assert.That(EllipseF.Unit.HorizontalRadius, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void op_Explicit_ShouldReturnEquivalentEllipse_GivenEllipse()
     {
         EllipseF unitEllipse = EllipseF.Unit;
         Ellipse converted = (Ellipse)unitEllipse;
 
-        Assert.AreEqual(unitEllipse, converted);
-        Assert.AreEqual(unitEllipse.HorizontalRadius, converted.HorizontalRadius);
-        Assert.AreEqual(unitEllipse.VerticalRadius, converted.VerticalRadius);
-        Assert.AreEqual(unitEllipse.Center, converted.Center);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((Ellipse)unitEllipse));
+            Assert.That(converted.HorizontalRadius, Is.EqualTo(unitEllipse.HorizontalRadius));
+            Assert.That(converted.VerticalRadius, Is.EqualTo(unitEllipse.VerticalRadius));
+            Assert.That((PointF)converted.Center, Is.EqualTo(unitEllipse.Center));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentEllipse_GivenCircle()
     {
         Circle unitCircle = Circle.Unit;
         EllipseF converted = unitCircle;
 
-        Assert.AreEqual(unitCircle, converted);
-        Assert.AreEqual(unitCircle.Radius, converted.HorizontalRadius);
-        Assert.AreEqual(unitCircle.Radius, converted.VerticalRadius);
-        Assert.AreEqual(unitCircle.Center, converted.Center);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((EllipseF)unitCircle));
+            Assert.That(converted.HorizontalRadius, Is.EqualTo(unitCircle.Radius));
+            Assert.That(converted.VerticalRadius, Is.EqualTo(unitCircle.Radius));
+            Assert.That(converted.Center, Is.EqualTo((PointF)unitCircle.Center));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentEllipse_GivenCircleF()
     {
         CircleF unitCircle = CircleF.Unit;
         EllipseF converted = unitCircle;
 
-        Assert.AreEqual(unitCircle, converted);
-        Assert.AreEqual(unitCircle.Radius, converted.HorizontalRadius);
-        Assert.AreEqual(unitCircle.Radius, converted.VerticalRadius);
-        Assert.AreEqual(unitCircle.Center, converted.Center);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((EllipseF)unitCircle));
+            Assert.That(converted.HorizontalRadius, Is.EqualTo(unitCircle.Radius));
+            Assert.That(converted.VerticalRadius, Is.EqualTo(unitCircle.Radius));
+            Assert.That(converted.Center, Is.EqualTo(unitCircle.Center));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentEllipse_GivenEllipse()
     {
         Ellipse unitEllipse = Ellipse.Unit;
         EllipseF converted = unitEllipse;
 
-        Assert.AreEqual(unitEllipse, converted);
-        Assert.AreEqual(unitEllipse.HorizontalRadius, converted.HorizontalRadius);
-        Assert.AreEqual(unitEllipse.VerticalRadius, converted.VerticalRadius);
-        Assert.AreEqual(unitEllipse.Center, converted.Center);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((EllipseF)unitEllipse));
+            Assert.That(converted.HorizontalRadius, Is.EqualTo(unitEllipse.HorizontalRadius));
+            Assert.That(converted.VerticalRadius, Is.EqualTo(unitEllipse.VerticalRadius));
+            Assert.That(converted.Center, Is.EqualTo((PointF)unitEllipse.Center));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void VerticalRadius_ShouldBe0_GivenEmptyEllipse()
     {
-        Assert.AreEqual(0, EllipseF.Empty.VerticalRadius);
+        Assert.That(EllipseF.Empty.VerticalRadius, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void VerticalRadius_ShouldBe1_GivenUnitEllipse()
     {
-        Assert.AreEqual(1, EllipseF.Unit.VerticalRadius);
+        Assert.That(EllipseF.Unit.VerticalRadius, Is.EqualTo(1));
     }
 }

X10D.Tests/src/Drawing/EllipseTests.cs

@@ -1,111 +1,124 @@
 using System.Drawing;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
+[TestFixture]
 public class EllipseTests
 {
-    [TestMethod]
+    [Test]
     public void Area_ShouldBePiRadiusRadius_GivenUnitEllipse()
     {
         var unitEllipse = Ellipse.Unit;
-        Assert.AreEqual(MathF.PI, unitEllipse.Area, 1e-6f);
+        Assert.That(unitEllipse.Area, Is.EqualTo(MathF.PI).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void ApproximateCircumference_ShouldBe2PiRadius_GivenUnitEllipse()
     {
         var unitEllipse = Ellipse.Unit;
-        Assert.AreEqual(2 * MathF.PI, unitEllipse.ApproximateCircumference, 1e-6f);
+        Assert.That(unitEllipse.ApproximateCircumference, Is.EqualTo(2.0f * MathF.PI).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldGiveCorrectEllipse()
     {
         var ellipse = new Ellipse(Point.Empty, new Size(2, 1));
-        Assert.AreEqual(new Point(0, 0), ellipse.Center);
-        Assert.AreEqual(new Size(2, 1), ellipse.Radius);
+        Assert.Multiple(() =>
+        {
+            Assert.That(ellipse.Center, Is.EqualTo(new Point(0, 0)));
+            Assert.That(ellipse.Radius, Is.EqualTo(new Size(2, 1)));
+        });
 
         ellipse = new Ellipse(0, 0, 2, 1);
-        Assert.AreEqual(new Point(0, 0), ellipse.Center);
-        Assert.AreEqual(new Size(2, 1), ellipse.Radius);
+        Assert.Multiple(() =>
+        {
+            Assert.That(ellipse.Center, Is.EqualTo(new Point(0, 0)));
+            Assert.That(ellipse.Radius, Is.EqualTo(new Size(2, 1)));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoUnitEllipses()
     {
         var unitEllipse1 = Ellipse.Unit;
         var unitEllipse2 = Ellipse.Unit;
-        Assert.AreEqual(unitEllipse1, unitEllipse2);
-        Assert.IsTrue(unitEllipse1 == unitEllipse2);
-        Assert.IsFalse(unitEllipse1 != unitEllipse2);
+        Assert.Multiple(() =>
+        {
+            Assert.That(unitEllipse2, Is.EqualTo(unitEllipse1));
+            Assert.That(unitEllipse1, Is.EqualTo(unitEllipse2));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentEllipses()
     {
-        Assert.AreNotEqual(Ellipse.Unit, Ellipse.Empty);
-        Assert.IsFalse(Ellipse.Unit == Ellipse.Empty);
-        Assert.IsTrue(Ellipse.Unit != Ellipse.Empty);
+        Assert.Multiple(() =>
+        {
+            Assert.That(Ellipse.Empty, Is.Not.EqualTo(Ellipse.Unit));
+            Assert.That(Ellipse.Unit, Is.Not.EqualTo(Ellipse.Empty));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.IsFalse(Ellipse.Unit.Equals(null));
+        Assert.That(Ellipse.Unit.Equals(null), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyEllipse()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Ellipse.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, Ellipse.Empty.GetHashCode());
+        Assert.That(Ellipse.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenUnitEllipse()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Ellipse.Unit.GetHashCode();
-        Assert.AreEqual(hashCode, Ellipse.Unit.GetHashCode());
+        Assert.That(Ellipse.Unit.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void HorizontalRadius_ShouldBe0_GivenEmptyEllipse()
     {
-        Assert.AreEqual(0, Ellipse.Empty.HorizontalRadius);
+        Assert.That(Ellipse.Empty.HorizontalRadius, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void HorizontalRadius_ShouldBe1_GivenUnitEllipse()
     {
-        Assert.AreEqual(1, Ellipse.Unit.HorizontalRadius);
+        Assert.That(Ellipse.Unit.HorizontalRadius, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentEllipse_GivenCircle()
     {
         Circle unitCircle = Circle.Unit;
         Ellipse converted = unitCircle;
 
-        Assert.AreEqual(unitCircle, converted);
-        Assert.AreEqual(unitCircle.Radius, converted.HorizontalRadius);
-        Assert.AreEqual(unitCircle.Radius, converted.VerticalRadius);
-        Assert.AreEqual(unitCircle.Center, converted.Center);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((Ellipse)unitCircle));
+            Assert.That(converted.HorizontalRadius, Is.EqualTo(unitCircle.Radius));
+            Assert.That(converted.VerticalRadius, Is.EqualTo(unitCircle.Radius));
+            Assert.That(converted.Center, Is.EqualTo(unitCircle.Center));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void VerticalRadius_ShouldBe0_GivenEmptyEllipse()
     {
-        Assert.AreEqual(0, Ellipse.Empty.VerticalRadius);
+        Assert.That(Ellipse.Empty.VerticalRadius, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void VerticalRadius_ShouldBe1_GivenUnitEllipse()
     {
-        Assert.AreEqual(1, Ellipse.Unit.VerticalRadius);
+        Assert.That(Ellipse.Unit.VerticalRadius, Is.EqualTo(1));
     }
 }

X10D.Tests/src/Drawing/Line3DTests.cs

@@ -1,116 +1,112 @@
 using System.Drawing;
 using System.Numerics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
+[TestFixture]
 public class Line3DTests
 {
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyAndOne()
     {
-        Assert.AreEqual(-1, Line3D.Empty.CompareTo(Line3D.One));
+        Assert.That(Line3D.Empty.CompareTo(Line3D.One), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyLineAndOneLineAsObject()
     {
-        Assert.AreEqual(-1, Line3D.Empty.CompareTo((object)Line3D.One));
+        Assert.That(Line3D.Empty.CompareTo((object)Line3D.One), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenNull()
     {
-        Assert.AreEqual(1, Line3D.One.CompareTo(null));
+        Assert.That(Line3D.One.CompareTo(null), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenOneAndEmpty()
     {
-        Assert.AreEqual(1, Line3D.One.CompareTo(Line3D.Empty));
+        Assert.That(Line3D.One.CompareTo(Line3D.Empty), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeZero_GivenUnitLine()
     {
         var unitLine3D = Line3D.One;
-        Assert.AreEqual(0, unitLine3D.CompareTo(unitLine3D));
+        Assert.That(unitLine3D.CompareTo(unitLine3D), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldThrowArgumentException_GivenInvalidType()
     {
-        Assert.ThrowsException<ArgumentException>(() => Line3D.Empty.CompareTo(new object()));
+        Assert.Throws<ArgumentException>(() => _ = Line3D.Empty.CompareTo(new object()));
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe0_GivenEmptyLine()
     {
-        Assert.AreEqual(0.0f, Line3D.Empty.Length);
+        Assert.That(Line3D.Empty.Length, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe1_GivenUnitXLine()
     {
-        Assert.AreEqual(1.0f, Line3D.UnitX.Length, 1e-6f);
+        Assert.That(Line3D.UnitX.Length, Is.EqualTo(1.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe1_GivenUnitYLine()
     {
-        Assert.AreEqual(1.0f, Line3D.UnitY.Length, 1e-6f);
+        Assert.That(Line3D.UnitY.Length, Is.EqualTo(1.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe1_GivenUnitZLine()
     {
-        Assert.AreEqual(1.0f, Line3D.UnitZ.Length, 1e-6f);
+        Assert.That(Line3D.UnitZ.Length, Is.EqualTo(1.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoUnitLines()
     {
         Line3D first = Line3D.One;
         Line3D second = Line3D.One;
 
-        Assert.AreEqual(first, second);
-        Assert.IsTrue(first == second);
-        Assert.IsFalse(first != second);
+        Assert.That(second, Is.EqualTo(first));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentLines()
     {
-        Assert.AreNotEqual(Line3D.One, Line3D.Empty);
-        Assert.IsFalse(Line3D.One == Line3D.Empty);
-        Assert.IsTrue(Line3D.One != Line3D.Empty);
+        Assert.That(Line3D.Empty, Is.Not.EqualTo(Line3D.One));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.IsFalse(Line3D.One.Equals(null));
+        Assert.That(Line3D.One, Is.Not.EqualTo(null));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyLine()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Line3D.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, Line3D.Empty.GetHashCode());
+        Assert.That(Line3D.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenUnitLine()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Line3D.One.GetHashCode();
-        Assert.AreEqual(hashCode, Line3D.One.GetHashCode());
+        Assert.That(Line3D.One.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void op_Explicit_ShouldReturnEquivalentLine_GivenLine()
     {
         Line3D oneLine = new Line3D(Vector3.Zero, Vector3.UnitX + Vector3.UnitY);
@@ -119,12 +115,15 @@ public class Line3DTests
         var expectedStart = new Point((int)oneLine.Start.X, (int)oneLine.Start.Y);
         var expectedEnd = new Point((int)oneLine.End.X, (int)oneLine.End.Y);
 
-        Assert.AreEqual(oneLine.Length, converted.Length);
-        Assert.AreEqual(expectedStart, converted.Start);
-        Assert.AreEqual(expectedEnd, converted.End);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted.Length, Is.EqualTo(oneLine.Length));
+            Assert.That(converted.Start, Is.EqualTo(expectedStart));
+            Assert.That(converted.End, Is.EqualTo(expectedEnd));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_Explicit_ShouldReturnEquivalentLineF_GivenLine()
     {
         Line3D oneLine = new Line3D(Vector3.Zero, Vector3.UnitX + Vector3.UnitY);
@@ -133,21 +132,22 @@ public class Line3DTests
         var expectedStart = new PointF(oneLine.Start.X, oneLine.Start.Y);
         var expectedEnd = new PointF(oneLine.End.X, oneLine.End.Y);
 
-        Assert.AreEqual(oneLine.Length, converted.Length);
-        Assert.AreEqual(expectedStart, converted.Start);
-        Assert.AreEqual(expectedEnd, converted.End);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted.Length, Is.EqualTo(oneLine.Length));
+            Assert.That(converted.Start, Is.EqualTo(expectedStart));
+            Assert.That(converted.End, Is.EqualTo(expectedEnd));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_GreaterThan_True_GivenUnitAndEmptyCircle()
     {
-        Assert.IsTrue(Line3D.One > Line3D.Empty);
-        Assert.IsTrue(Line3D.One >= Line3D.Empty);
-        Assert.IsFalse(Line3D.One < Line3D.Empty);
-        Assert.IsFalse(Line3D.One <= Line3D.Empty);
+        Assert.That(Line3D.One, Is.GreaterThan(Line3D.Empty));
+        Assert.That(Line3D.One, Is.GreaterThanOrEqualTo(Line3D.Empty));
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentLine_GivenLine()
     {
         Line oneLine = Line.One;
@@ -156,13 +156,16 @@ public class Line3DTests
         var expectedStart = new Vector3(oneLine.Start.X, oneLine.Start.Y, 0.0f);
         var expectedEnd = new Vector3(oneLine.End.X, oneLine.End.Y, 0.0f);
 
-        Assert.AreEqual(oneLine, converted);
-        Assert.AreEqual(oneLine.Length, converted.Length);
-        Assert.AreEqual(expectedStart, converted.Start);
-        Assert.AreEqual(expectedEnd, converted.End);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((Line3D)oneLine));
+            Assert.That(converted.Length, Is.EqualTo(oneLine.Length));
+            Assert.That(converted.Start, Is.EqualTo(expectedStart));
+            Assert.That(converted.End, Is.EqualTo(expectedEnd));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentLine_GivenLineF()
     {
         LineF oneLine = LineF.One;
@@ -171,18 +174,19 @@ public class Line3DTests
         var expectedStart = new Vector3(oneLine.Start.X, oneLine.Start.Y, 0.0f);
         var expectedEnd = new Vector3(oneLine.End.X, oneLine.End.Y, 0.0f);
 
-        Assert.AreEqual(oneLine, converted);
-        Assert.AreEqual(oneLine.Length, converted.Length);
-        Assert.AreEqual(expectedStart, converted.Start);
-        Assert.AreEqual(expectedEnd, converted.End);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((Line3D)oneLine));
+            Assert.That(converted.Length, Is.EqualTo(oneLine.Length));
+            Assert.That(converted.Start, Is.EqualTo(expectedStart));
+            Assert.That(converted.End, Is.EqualTo(expectedEnd));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_LessThan_True_GivenEmptyAndUnitCircle()
     {
-        Assert.IsTrue(Line3D.Empty < Line3D.One);
-        Assert.IsTrue(Line3D.Empty <= Line3D.One);
-        Assert.IsFalse(Line3D.Empty > Line3D.One);
-        Assert.IsFalse(Line3D.Empty >= Line3D.One);
+        Assert.That(Line3D.Empty, Is.LessThan(Line3D.One));
+        Assert.That(Line3D.Empty, Is.LessThanOrEqualTo(Line3D.One));
     }
 }

X10D.Tests/src/Drawing/LineFTests.cs

@@ -1,146 +1,152 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Drawing;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
+[TestFixture]
 public class LineFTests
 {
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyAndOne()
     {
-        Assert.AreEqual(-1, LineF.Empty.CompareTo(LineF.One));
+        Assert.That(LineF.Empty.CompareTo(LineF.One), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyLineAndOneLineAsObject()
     {
-        Assert.AreEqual(-1, LineF.Empty.CompareTo((object)LineF.One));
+        Assert.That(LineF.Empty.CompareTo((object)LineF.One), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenNull()
     {
-        Assert.AreEqual(1, LineF.One.CompareTo(null));
+        Assert.That(LineF.One.CompareTo(null), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenOneAndEmpty()
     {
-        Assert.AreEqual(1, LineF.One.CompareTo(LineF.Empty));
+        Assert.That(LineF.One.CompareTo(LineF.Empty), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeZero_GivenUnitLine()
     {
-        var unitLineF = LineF.One;
-        Assert.AreEqual(0, unitLineF.CompareTo(unitLineF));
+        Assert.That(LineF.One.CompareTo(LineF.One), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldThrowArgumentException_GivenInvalidType()
     {
-        Assert.ThrowsException<ArgumentException>(() => LineF.Empty.CompareTo(new object()));
+        Assert.Throws<ArgumentException>(() => _ = LineF.Empty.CompareTo(new object()));
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe0_GivenEmptyLine()
     {
-        Assert.AreEqual(0.0f, LineF.Empty.Length);
+        Assert.That(LineF.Empty.Length, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe1_GivenUnitXLine()
     {
-        Assert.AreEqual(1.0f, LineF.UnitX.Length, 1e-6f);
+        Assert.That(LineF.UnitX.Length, Is.EqualTo(1.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe1_GivenUnitYLine()
     {
-        Assert.AreEqual(1.0f, LineF.UnitY.Length, 1e-6f);
+        Assert.That(LineF.UnitY.Length, Is.EqualTo(1.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoUnitLines()
     {
         LineF first = LineF.One;
         LineF second = LineF.One;
 
-        Assert.AreEqual(first, second);
-        Assert.IsTrue(first == second);
-        Assert.IsFalse(first != second);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.EqualTo(first));
+            Assert.That(first, Is.EqualTo(second));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentLines()
     {
-        Assert.AreNotEqual(LineF.One, LineF.Empty);
-        Assert.IsFalse(LineF.One == LineF.Empty);
-        Assert.IsTrue(LineF.One != LineF.Empty);
+        Assert.Multiple(() =>
+        {
+            Assert.That(LineF.Empty, Is.Not.EqualTo(LineF.One));
+            Assert.That(LineF.One, Is.Not.EqualTo(LineF.Empty));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.IsFalse(LineF.One.Equals(null));
+        Assert.That(LineF.One, Is.Not.EqualTo(null));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyLine()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = LineF.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, LineF.Empty.GetHashCode());
+        Assert.That(LineF.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenUnitLine()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = LineF.One.GetHashCode();
-        Assert.AreEqual(hashCode, LineF.One.GetHashCode());
+        Assert.That(LineF.One.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void op_Explicit_ShouldReturnEquivalentLine_GivenLine()
     {
         LineF oneLine = LineF.One;
         Line converted = (Line)oneLine;
 
-        Assert.AreEqual(oneLine, converted);
-        Assert.AreEqual(oneLine.Length, converted.Length);
-        Assert.AreEqual(oneLine.Start, converted.Start);
-        Assert.AreEqual(oneLine.End, converted.End);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((Line)oneLine));
+            Assert.That(converted.Length, Is.EqualTo(oneLine.Length));
+            Assert.That((PointF)converted.Start, Is.EqualTo(oneLine.Start));
+            Assert.That((PointF)converted.End, Is.EqualTo(oneLine.End));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_GreaterThan_True_GivenUnitAndEmptyCircle()
     {
-        Assert.IsTrue(LineF.One > LineF.Empty);
-        Assert.IsTrue(LineF.One >= LineF.Empty);
-        Assert.IsFalse(LineF.One < LineF.Empty);
-        Assert.IsFalse(LineF.One <= LineF.Empty);
+        Assert.That(LineF.One, Is.GreaterThan(LineF.Empty));
+        Assert.That(LineF.One, Is.GreaterThanOrEqualTo(LineF.Empty));
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentLine_GivenLine()
     {
         Line oneLine = Line.One;
         LineF converted = oneLine;
 
-        Assert.AreEqual(oneLine, converted);
-        Assert.AreEqual(oneLine.Length, converted.Length);
-        Assert.AreEqual(oneLine.Start, converted.Start);
-        Assert.AreEqual(oneLine.End, converted.End);
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((LineF)oneLine));
+            Assert.That(converted.Length, Is.EqualTo(oneLine.Length));
+            Assert.That(converted.Start, Is.EqualTo((PointF)oneLine.Start));
+            Assert.That(converted.End, Is.EqualTo((PointF)oneLine.End));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_LessThan_True_GivenEmptyAndUnitCircle()
     {
-        Assert.IsTrue(LineF.Empty < LineF.One);
-        Assert.IsTrue(LineF.Empty <= LineF.One);
-        Assert.IsFalse(LineF.Empty > LineF.One);
-        Assert.IsFalse(LineF.Empty >= LineF.One);
+        Assert.That(LineF.Empty, Is.LessThan(LineF.One));
+        Assert.That(LineF.Empty, Is.LessThanOrEqualTo(LineF.One));
     }
 }

X10D.Tests/src/Drawing/LineTests.cs

@@ -1,122 +1,122 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
+[TestFixture]
 public class LineTests
 {
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyAndOne()
     {
-        Assert.AreEqual(-1, Line.Empty.CompareTo(Line.One));
+        Assert.That(Line.Empty.CompareTo(Line.One), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyLineAndOneLineAsObject()
     {
-        Assert.AreEqual(-1, Line.Empty.CompareTo((object)Line.One));
+        Assert.That(Line.Empty.CompareTo((object)Line.One), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenNull()
     {
-        Assert.AreEqual(1, Line.One.CompareTo(null));
+        Assert.That(Line.One.CompareTo(null), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenOneAndEmpty()
     {
-        Assert.AreEqual(1, Line.One.CompareTo(Line.Empty));
+        Assert.That(Line.One.CompareTo(Line.Empty), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeZero_GivenUnitLine()
     {
         var unitLine = Line.One;
-        Assert.AreEqual(0, unitLine.CompareTo(unitLine));
+        Assert.That(unitLine.CompareTo(unitLine), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldThrowArgumentException_GivenInvalidType()
     {
-        Assert.ThrowsException<ArgumentException>(() => Line.Empty.CompareTo(new object()));
+        Assert.Throws<ArgumentException>(() => _ = Line.Empty.CompareTo(new object()));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoUnitLines()
     {
         Line first = Line.One;
         Line second = Line.One;
 
-        Assert.AreEqual(first, second);
-        Assert.IsTrue(first == second);
-        Assert.IsFalse(first != second);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.EqualTo(first));
+            Assert.That(first, Is.EqualTo(second));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentLines()
     {
-        Assert.AreNotEqual(Line.One, Line.Empty);
-        Assert.IsFalse(Line.One == Line.Empty);
-        Assert.IsTrue(Line.One != Line.Empty);
+        Assert.Multiple(() =>
+        {
+            Assert.That(Line.Empty, Is.Not.EqualTo(Line.One));
+            Assert.That(Line.One, Is.Not.EqualTo(Line.Empty));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.IsFalse(Line.One.Equals(null));
+        Assert.That(Line.One, Is.Not.EqualTo(null));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyLine()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Line.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, Line.Empty.GetHashCode());
+        Assert.That(Line.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenUnitLine()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Line.One.GetHashCode();
-        Assert.AreEqual(hashCode, Line.One.GetHashCode());
+        Assert.That(Line.One.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe0_GivenEmptyLine()
     {
-        Assert.AreEqual(0.0f, Line.Empty.Length);
+        Assert.That(Line.Empty.Length, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe1_GivenUnitXLine()
     {
-        Assert.AreEqual(1.0f, Line.UnitX.Length, 1e-6f);
+        Assert.That(Line.UnitX.Length, Is.EqualTo(1.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Length_ShouldBe1_GivenUnitYLine()
     {
-        Assert.AreEqual(1.0f, Line.UnitY.Length, 1e-6f);
+        Assert.That(Line.UnitY.Length, Is.EqualTo(1.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void op_GreaterThan_True_GivenUnitAndEmptyCircle()
     {
-        Assert.IsTrue(Line.One > Line.Empty);
-        Assert.IsTrue(Line.One >= Line.Empty);
-        Assert.IsFalse(Line.One < Line.Empty);
-        Assert.IsFalse(Line.One <= Line.Empty);
+        Assert.That(Line.One, Is.GreaterThan(Line.Empty));
+        Assert.That(Line.One, Is.GreaterThanOrEqualTo(Line.Empty));
     }
 
-    [TestMethod]
+    [Test]
     public void op_LessThan_True_GivenEmptyAndUnitCircle()
     {
-        Assert.IsTrue(Line.Empty < Line.One);
-        Assert.IsTrue(Line.Empty <= Line.One);
-        Assert.IsFalse(Line.Empty > Line.One);
-        Assert.IsFalse(Line.Empty >= Line.One);
+        Assert.That(Line.Empty, Is.LessThan(Line.One));
+        Assert.That(Line.Empty, Is.LessThanOrEqualTo(Line.One));
     }
 }

X10D.Tests/src/Drawing/PointFTests.cs

@@ -1,5 +1,5 @@
 using System.Drawing;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 #if !NET6_0_OR_GREATER
 using X10D.Core;
 #endif
@@ -7,59 +7,74 @@ using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
+[TestFixture]
 public class PointFTests
 {
-    [TestMethod]
+    [Test]
     public void IsOnLine_ShouldReturnTrue_GivenPointOnLine()
     {
         var point = new PointF(1.0f, 0.0f);
         var line = new LineF(PointF.Empty, new PointF(2.0f, 0.0f));
 
-        Assert.IsTrue(point.IsOnLine(line));
-        Assert.IsTrue(point.IsOnLine(line.Start, line.End));
-        Assert.IsTrue(point.IsOnLine(line.Start.ToVector2(), line.End.ToVector2()));
+        Assert.Multiple(() =>
+        {
+            Assert.That(point.IsOnLine(line));
+            Assert.That(point.IsOnLine(line.Start, line.End));
+            Assert.That(point.IsOnLine(line.Start.ToVector2(), line.End.ToVector2()));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IsOnLine_ShouldReturnFalse_GivenPointNotOnLine()
     {
         var point = new PointF(1.0f, 1.0f);
         var line = new LineF(PointF.Empty, new PointF(2.0f, 0.0f));
 
-        Assert.IsFalse(point.IsOnLine(line));
-        Assert.IsFalse(point.IsOnLine(line.Start, line.End));
-        Assert.IsFalse(point.IsOnLine(line.Start.ToVector2(), line.End.ToVector2()));
+        Assert.Multiple(() =>
+        {
+            Assert.That(point.IsOnLine(line), Is.False);
+            Assert.That(point.IsOnLine(line.Start, line.End), Is.False);
+            Assert.That(point.IsOnLine(line.Start.ToVector2(), line.End.ToVector2()), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Round_ShouldRoundToNearestInteger_GivenNoParameters()
     {
         var point = new PointF(1.5f, 2.6f);
         var rounded = point.Round();
 
-        Assert.AreEqual(2, rounded.X);
-        Assert.AreEqual(3, rounded.Y);
+        Assert.Multiple(() =>
+        {
+            Assert.That(rounded.X, Is.EqualTo(2));
+            Assert.That(rounded.Y, Is.EqualTo(3));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Round_ShouldRoundToNearest10_GivenPrecision10()
     {
         var point = new PointF(1.5f, 25.2f);
         var rounded = point.Round(10);
 
-        Assert.AreEqual(0, rounded.X);
-        Assert.AreEqual(30, rounded.Y);
+        Assert.Multiple(() =>
+        {
+            Assert.That(rounded.X, Is.Zero);
+            Assert.That(rounded.Y, Is.EqualTo(30));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ToSizeF_ShouldReturnSize_WithEquivalentMembers()
     {
         var random = new Random();
         var point = new PointF(random.NextSingle(), random.NextSingle());
         var size = point.ToSizeF();
 
-        Assert.AreEqual(point.X, size.Width, 1e-6f);
-        Assert.AreEqual(point.Y, size.Height, 1e-6f);
+        Assert.Multiple(() =>
+        {
+            Assert.That(size.Width, Is.EqualTo(point.X).Within(1e-6f));
+            Assert.That(size.Height, Is.EqualTo(point.Y).Within(1e-6f));
+        });
     }
 }

X10D.Tests/src/Drawing/PointTests.cs

@@ -1,64 +1,79 @@
 using System.Drawing;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
+[TestFixture]
 public class PointTests
 {
-    [TestMethod]
+    [Test]
     public void IsOnLine_ShouldReturnTrue_GivenPointOnLine()
     {
         var point = new Point(1, 0);
         var line = new Line(Point.Empty, new Point(2, 0));
 
-        Assert.IsTrue(point.IsOnLine(line));
-        Assert.IsTrue(point.IsOnLine(line.Start, line.End));
-        Assert.IsTrue(point.IsOnLine(line.Start.ToVector2(), line.End.ToVector2()));
+        Assert.Multiple(() =>
+        {
+            Assert.That(point.IsOnLine(line));
+            Assert.That(point.IsOnLine(line.Start, line.End));
+            Assert.That(point.IsOnLine(line.Start.ToVector2(), line.End.ToVector2()));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IsOnLine_ShouldReturnFalse_GivenPointNotOnLine()
     {
         var point = new Point(1, 1);
         var line = new Line(Point.Empty, new Point(2, 0));
 
-        Assert.IsFalse(point.IsOnLine(line));
-        Assert.IsFalse(point.IsOnLine(line.Start, line.End));
-        Assert.IsFalse(point.IsOnLine(line.Start.ToVector2(), line.End.ToVector2()));
+        Assert.Multiple(() =>
+        {
+            Assert.That(point.IsOnLine(line), Is.False);
+            Assert.That(point.IsOnLine(line.Start, line.End), Is.False);
+            Assert.That(point.IsOnLine(line.Start.ToVector2(), line.End.ToVector2()), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ToSize_ShouldReturnSize_WithEquivalentMembers()
     {
         var random = new Random();
         var point = new Point(random.Next(), random.Next());
         var size = point.ToSize();
 
-        Assert.AreEqual(point.X, size.Width);
-        Assert.AreEqual(point.Y, size.Height);
+        Assert.Multiple(() =>
+        {
+            Assert.That(size.Width, Is.EqualTo(point.X));
+            Assert.That(size.Height, Is.EqualTo(point.Y));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ToSizeF_ShouldReturnSize_WithEquivalentMembers()
     {
         var random = new Random();
         var point = new Point(random.Next(), random.Next());
         var size = point.ToSizeF();
 
-        Assert.AreEqual(point.X, size.Width, 1e-6f);
-        Assert.AreEqual(point.Y, size.Height, 1e-6f);
+        Assert.Multiple(() =>
+        {
+            Assert.That(size.Width, Is.EqualTo(point.X).Within(1e-6f));
+            Assert.That(size.Height, Is.EqualTo(point.Y).Within(1e-6f));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ToVector2_ShouldReturnVector_WithEquivalentMembers()
     {
         var random = new Random();
         var point = new Point(random.Next(), random.Next());
         var size = point.ToVector2();
 
-        Assert.AreEqual(point.X, size.X, 1e-6f);
-        Assert.AreEqual(point.Y, size.Y, 1e-6f);
+        Assert.Multiple(() =>
+        {
+            Assert.That(size.X, Is.EqualTo(point.X).Within(1e-6f));
+            Assert.That(size.Y, Is.EqualTo(point.Y).Within(1e-6f));
+        });
     }
 }

X10D.Tests/src/Drawing/PolygonFTests.cs

@@ -1,228 +1,223 @@
 using System.Drawing;
 using System.Numerics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
+[TestFixture]
 public class PolygonFTests
 {
-    [TestMethod]
+    [Test]
     public void AddVertices_ShouldAddVertices()
     {
         var polygon = PolygonF.Empty;
         polygon.AddVertices(new[] {new PointF(1, 2), new PointF(3, 4)});
-        Assert.AreEqual(2, polygon.VertexCount);
+        Assert.That(polygon.VertexCount, Is.EqualTo(2));
 
         // assert that the empty polygon was not modified
-        Assert.AreEqual(0, PolygonF.Empty.VertexCount);
+        Assert.That(PolygonF.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void AddVertices_ShouldThrowArgumentNullException_GivenNullEnumerableOfPointF()
     {
         var polygon = PolygonF.Empty;
         IEnumerable<PointF> vertices = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => polygon.AddVertices(vertices));
+        Assert.Throws<ArgumentNullException>(() => polygon.AddVertices(vertices));
     }
 
-    [TestMethod]
+    [Test]
     public void AddVertices_ShouldThrowArgumentNullException_GivenNullEnumerableOfVector2()
     {
         var polygon = PolygonF.Empty;
         IEnumerable<Vector2> vertices = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => polygon.AddVertices(vertices));
+        Assert.Throws<ArgumentNullException>(() => polygon.AddVertices(vertices));
     }
 
-    [TestMethod]
+    [Test]
     public void ClearVertices_ShouldClearVertices()
     {
         var polygon = PolygonF.Empty;
         polygon.AddVertices(new[] {new Vector2(1, 2), new Vector2(3, 4)});
-        Assert.AreEqual(2, polygon.VertexCount);
+        Assert.That(polygon.VertexCount, Is.EqualTo(2));
 
         // assert that the empty polygon was not modified
-        Assert.AreEqual(0, PolygonF.Empty.VertexCount);
+        Assert.That(PolygonF.Empty.VertexCount, Is.Zero);
 
         polygon.ClearVertices();
-        Assert.AreEqual(0, polygon.VertexCount);
+        Assert.That(polygon.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldPopulateVertices_GivenPolygon()
     {
         var pointPolygon = new PolygonF(new[] {new PointF(1, 2), new PointF(3, 4)});
         var vectorPolygon = new PolygonF(new[] {new Vector2(1, 2), new Vector2(3, 4)});
 
-        Assert.AreEqual(2, pointPolygon.VertexCount);
-        Assert.AreEqual(2, vectorPolygon.VertexCount);
+        Assert.That(pointPolygon.VertexCount, Is.EqualTo(2));
+        Assert.That(vectorPolygon.VertexCount, Is.EqualTo(2));
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldThrowArgumentNullException_GivenNullEnumerableOfPointF()
     {
         IEnumerable<PointF> vertices = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => new PolygonF(vertices));
+        Assert.Throws<ArgumentNullException>(() => _ = new PolygonF(vertices));
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldThrowArgumentNullException_GivenNullEnumerableOfVector2()
     {
         IEnumerable<Vector2> vertices = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => new PolygonF(vertices));
+        Assert.Throws<ArgumentNullException>(() => _ = new PolygonF(vertices));
     }
 
-    [TestMethod]
+    [Test]
     public void CopyConstructor_ShouldCopyVertices_GivenPolygon()
     {
         var first = PolygonF.Empty;
         first.AddVertices(new[] {new PointF(1, 2), new PointF(3, 4)});
 
         var second = new PolygonF(first);
-        Assert.AreEqual(2, first.VertexCount);
-        Assert.AreEqual(2, second.VertexCount);
+        Assert.That(first.VertexCount, Is.EqualTo(2));
+        Assert.That(second.VertexCount, Is.EqualTo(2));
 
         // we cannot use CollectionAssert here for reasons I am not entirely sure of.
         // it seems to dislike casting from IReadOnlyList<Point> to ICollection. but okay.
-        Assert.IsTrue(first.Vertices.SequenceEqual(second.Vertices));
+        CollectionAssert.AreEqual(first.Vertices, second.Vertices);
 
         // assert that the empty polygon was not modified
-        Assert.AreEqual(0, PolygonF.Empty.VertexCount);
+        Assert.That(PolygonF.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void CopyConstructor_ShouldThrowArgumentNullException_GivenNullPolygonF()
     {
         PolygonF polygon = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => new PolygonF(polygon));
+        Assert.Throws<ArgumentNullException>(() => _ = new PolygonF(polygon));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoEmptyPolygons()
     {
         var first = PolygonF.Empty;
         var second = PolygonF.Empty;
 
-        Assert.AreEqual(first, second);
-        Assert.AreEqual(second, first);
-        Assert.IsTrue(first.Equals(second));
-        Assert.IsTrue(second.Equals(first));
-        Assert.IsTrue(first == second);
-        Assert.IsTrue(second == first);
-        Assert.IsFalse(first != second);
-        Assert.IsFalse(second != first);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.EqualTo(first));
+            Assert.That(first, Is.EqualTo(second));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoHexagons()
     {
         PolygonF first = CreateHexagon();
         PolygonF second = CreateHexagon();
 
-        Assert.AreEqual(first, second);
-        Assert.AreEqual(second, first);
-        Assert.IsTrue(first.Equals(second));
-        Assert.IsTrue(second.Equals(first));
-        Assert.IsTrue(first == second);
-        Assert.IsTrue(second == first);
-        Assert.IsFalse(first != second);
-        Assert.IsFalse(second != first);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.EqualTo(first));
+            Assert.That(first, Is.EqualTo(second));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenHexagonAndEmptyPolygon()
     {
         PolygonF first = CreateHexagon();
         PolygonF second = PolygonF.Empty;
 
-        Assert.AreNotEqual(first, second);
-        Assert.AreNotEqual(second, first);
-        Assert.IsFalse(first.Equals(second));
-        Assert.IsFalse(second.Equals(first));
-        Assert.IsFalse(first == second);
-        Assert.IsFalse(second == first);
-        Assert.IsTrue(first != second);
-        Assert.IsTrue(second != first);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.Not.EqualTo(first));
+            Assert.That(first, Is.Not.EqualTo(second));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void FromPolygon_ShouldThrowArgumentNullException_GivenNullPolygonF()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => PolygonF.FromPolygon(null!));
+        Assert.Throws<ArgumentNullException>(() => PolygonF.FromPolygon(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void IsConvex_ShouldBeFalse_GivenEmptyPolygon()
     {
-        Assert.IsFalse(PolygonF.Empty.IsConvex);
+        Assert.That(PolygonF.Empty.IsConvex, Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void IsConvex_ShouldBeTrue_GivenHexagon()
     {
-        Assert.IsTrue(CreateHexagon().IsConvex);
+        Assert.That(CreateHexagon().IsConvex, Is.True);
     }
 
-    [TestMethod]
+    [Test]
     public void IsConvex_ShouldBeFalse_GivenConcavePolygon()
     {
-        Assert.IsFalse(CreateConcavePolygon().IsConvex);
+        Assert.That(CreateConcavePolygon().IsConvex, Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void op_Explicit_ShouldReturnEquivalentCircle_GivenCircle()
     {
         PolygonF polygon = CreateHexagon();
         Polygon converted = (Polygon)polygon;
 
-        Assert.AreEqual(polygon, converted);
-        Assert.AreEqual(polygon.IsConvex, converted.IsConvex);
-        Assert.AreEqual(polygon.VertexCount, converted.VertexCount);
-
-        Assert.IsTrue(polygon.Vertices.SequenceEqual(converted.Vertices.Select(p => (PointF)p)));
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((Polygon)polygon));
+            Assert.That(converted.IsConvex, Is.EqualTo(polygon.IsConvex));
+            Assert.That(converted.VertexCount, Is.EqualTo(polygon.VertexCount));
+            CollectionAssert.AreEqual(polygon.Vertices, converted.Vertices.Select(p => (PointF)p));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentCircle_GivenCircle()
     {
         Polygon polygon = PolygonTests.CreateHexagon();
         PolygonF converted = polygon;
 
-        Assert.AreEqual(polygon, converted);
-        Assert.AreEqual(polygon.IsConvex, converted.IsConvex);
-        Assert.AreEqual(polygon.VertexCount, converted.VertexCount);
-
-        Assert.IsTrue(converted.Vertices.SequenceEqual(polygon.Vertices.Select(p => (PointF)p)));
+        Assert.Multiple(() =>
+        {
+            Assert.That(converted, Is.EqualTo((PolygonF)polygon));
+            Assert.That(converted.IsConvex, Is.EqualTo(polygon.IsConvex));
+            Assert.That(converted.VertexCount, Is.EqualTo(polygon.VertexCount));
+            CollectionAssert.AreEqual(converted.Vertices, polygon.Vertices.Select(p => (PointF)p));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void PointCount_ShouldBe1_GivenPolygonFWith1Point()
     {
         var polygon = new PolygonF();
         polygon.AddVertex(new Point(1, 1));
 
-        Assert.AreEqual(1, polygon.VertexCount);
+        Assert.That(polygon.VertexCount, Is.EqualTo(1));
 
         // assert that the empty polygon was not modified
-        Assert.AreEqual(0, PolygonF.Empty.VertexCount);
+        Assert.That(PolygonF.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void PointCount_ShouldBe0_GivenEmptyPolygon()
     {
-        Assert.AreEqual(0, PolygonF.Empty.VertexCount);
+        Assert.That(PolygonF.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = PolygonF.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, PolygonF.Empty.GetHashCode());
+        Assert.That(PolygonF.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    internal static PolygonF CreateHexagon()
+    private static PolygonF CreateHexagon()
     {
         var hexagon = new PolygonF();
         hexagon.AddVertex(new Vector2(0, 0));
@@ -234,7 +229,7 @@ public class PolygonFTests
         return hexagon;
     }
 
-    internal static PolygonF CreateConcavePolygon()
+    private static PolygonF CreateConcavePolygon()
     {
         var hexagon = new PolygonF();
         hexagon.AddVertex(new Vector2(0, 0));

X10D.Tests/src/Drawing/PolygonTests.cs

@@ -1,120 +1,118 @@
 using System.Drawing;
-using System.Numerics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
+[TestFixture]
 public class PolygonTests
 {
-    [TestMethod]
+    [Test]
     public void AddVertices_ShouldAddVertices()
     {
         var polygon = Polygon.Empty;
         polygon.AddVertices(new[] {new Point(1, 2), new Point(3, 4)});
-        Assert.AreEqual(2, polygon.VertexCount);
-
+        Assert.That(polygon.VertexCount, Is.EqualTo(2));
 
         // assert that the empty polygon was not modified
-        Assert.AreEqual(0, Polygon.Empty.VertexCount);
+        Assert.That(Polygon.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void AddVertices_ShouldThrowArgumentNullException_GivenNullEnumerable()
     {
         var polygon = Polygon.Empty;
         IEnumerable<Point> vertices = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => polygon.AddVertices(vertices));
+        Assert.Throws<ArgumentNullException>(() => polygon.AddVertices(vertices));
     }
 
-    [TestMethod]
+    [Test]
     public void ClearVertices_ShouldClearVertices()
     {
         var polygon = Polygon.Empty;
         polygon.AddVertices(new[] {new Point(1, 2), new Point(3, 4)});
-        Assert.AreEqual(2, polygon.VertexCount);
+        Assert.That(polygon.VertexCount, Is.EqualTo(2));
 
         // assert that the empty polygon was not modified
-        Assert.AreEqual(0, Polygon.Empty.VertexCount);
+        Assert.That(Polygon.Empty.VertexCount, Is.Zero);
 
         polygon.ClearVertices();
-        Assert.AreEqual(0, polygon.VertexCount);
+        Assert.That(polygon.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldPopulateVertices_GivenPolygon()
     {
         var pointPolygon = new Polygon(new[] {new Point(1, 2), new Point(3, 4)});
 
-        Assert.AreEqual(2, pointPolygon.VertexCount);
+        Assert.That(pointPolygon.VertexCount, Is.EqualTo(2));
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldThrowArgumentNullException_GivenNullEnumerableOfPoint()
     {
         IEnumerable<Point> vertices = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => new Polygon(vertices));
+        Assert.Throws<ArgumentNullException>(() => new Polygon(vertices));
     }
 
-    [TestMethod]
+    [Test]
     public void CopyConstructor_ShouldCopyVertices_GivenPolygon()
     {
         var first = Polygon.Empty;
         first.AddVertices(new[] {new Point(1, 2), new Point(3, 4)});
 
         var second = new Polygon(first);
-        Assert.AreEqual(2, first.VertexCount);
-        Assert.AreEqual(2, second.VertexCount);
+        Assert.That(first.VertexCount, Is.EqualTo(2));
+        Assert.That(second.VertexCount, Is.EqualTo(2));
 
         // we cannot use CollectionAssert here for reasons I am not entirely sure of.
         // it seems to dislike casting from IReadOnlyList<Point> to ICollection. but okay.
-        Assert.IsTrue(first.Vertices.SequenceEqual(second.Vertices));
+        Assert.That(first.Vertices.SequenceEqual(second.Vertices));
 
         // assert that the empty polygon was not modified
-        Assert.AreEqual(0, Polygon.Empty.VertexCount);
+        Assert.That(Polygon.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void CopyConstructor_ShouldThrowArgumentNullException_GivenNullPolygon()
     {
         Polygon polygon = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => new Polygon(polygon));
+        Assert.Throws<ArgumentNullException>(() => new Polygon(polygon));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoEmptyPolygons()
     {
         var first = Polygon.Empty;
         var second = Polygon.Empty;
 
-        Assert.AreEqual(first, second);
-        Assert.AreEqual(second, first);
-        Assert.IsTrue(first.Equals(second));
-        Assert.IsTrue(second.Equals(first));
-        Assert.IsTrue(first == second);
-        Assert.IsTrue(second == first);
-        Assert.IsFalse(first != second);
-        Assert.IsFalse(second != first);
+        Assert.That(second, Is.EqualTo(first));
+        Assert.That(first, Is.EqualTo(second));
+        Assert.That(first.Equals(second));
+        Assert.That(second.Equals(first));
+        Assert.That(first == second);
+        Assert.That(second == first);
+        Assert.That(first != second, Is.False);
+        Assert.That(second != first, Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoHexagons()
     {
         Polygon first = CreateHexagon();
         Polygon second = CreateHexagon();
 
-        Assert.AreEqual(first, second);
-        Assert.AreEqual(second, first);
-        Assert.IsTrue(first.Equals(second));
-        Assert.IsTrue(second.Equals(first));
-        Assert.IsTrue(first == second);
-        Assert.IsTrue(second == first);
-        Assert.IsFalse(first != second);
-        Assert.IsFalse(second != first);
+        Assert.That(second, Is.EqualTo(first));
+        Assert.That(first, Is.EqualTo(second));
+        Assert.That(first.Equals(second));
+        Assert.That(second.Equals(first));
+        Assert.That(first == second);
+        Assert.That(second == first);
+        Assert.That(first != second, Is.False);
+        Assert.That(second != first, Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenHexagonAndEmptyPolygon()
     {
         Polygon first = CreateHexagon();
@@ -122,15 +120,15 @@ public class PolygonTests
 
         Assert.AreNotEqual(first, second);
         Assert.AreNotEqual(second, first);
-        Assert.IsFalse(first.Equals(second));
-        Assert.IsFalse(second.Equals(first));
-        Assert.IsFalse(first == second);
-        Assert.IsFalse(second == first);
-        Assert.IsTrue(first != second);
-        Assert.IsTrue(second != first);
+        Assert.That(first.Equals(second), Is.False);
+        Assert.That(second.Equals(first), Is.False);
+        Assert.That(first == second, Is.False);
+        Assert.That(second == first, Is.False);
+        Assert.That(first != second);
+        Assert.That(second != first);
     }
 
-    [TestMethod]
+    [Test]
     public void FromPolygonF_ShouldReturnEquivalentPolygon_GivenPolygon()
     {
         PolygonF hexagon = CreateHexagonF();
@@ -138,57 +136,57 @@ public class PolygonTests
         Polygon expected = CreateHexagon();
         Polygon actual = Polygon.FromPolygonF(hexagon);
 
-        Assert.AreEqual(expected, actual);
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void FromPolygonF_ShouldThrowArgumentNullException_GivenNullPolygon()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Polygon.FromPolygonF(null!));
+        Assert.Throws<ArgumentNullException>(() => Polygon.FromPolygonF(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void IsConvex_ShouldBeFalse_GivenEmptyPolygon()
     {
-        Assert.IsFalse(Polygon.Empty.IsConvex);
+        Assert.That(Polygon.Empty.IsConvex, Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void IsConvex_ShouldBeTrue_GivenHexagon()
     {
-        Assert.IsTrue(CreateHexagon().IsConvex);
+        Assert.That(CreateHexagon().IsConvex);
     }
 
-    [TestMethod]
+    [Test]
     public void IsConvex_ShouldBeFalse_GivenConcavePolygon()
     {
-        Assert.IsFalse(CreateConcavePolygon().IsConvex);
+        Assert.That(CreateConcavePolygon().IsConvex, Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void PointCount_ShouldBe1_GivenPolygonWith1Point()
     {
         var polygon = Polygon.Empty;
         polygon.AddVertex(new Point(1, 1));
 
-        Assert.AreEqual(1, polygon.VertexCount);
+        Assert.That(polygon.VertexCount, Is.EqualTo(1));
 
         // assert that the empty polygon was not modified
-        Assert.AreEqual(0, Polygon.Empty.VertexCount);
+        Assert.That(Polygon.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void PointCount_ShouldBe0_GivenEmptyPolygon()
     {
-        Assert.AreEqual(0, Polygon.Empty.VertexCount);
+        Assert.That(Polygon.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Polygon.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, Polygon.Empty.GetHashCode());
+        Assert.That(Polygon.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
     internal static Polygon CreateHexagon()

X10D.Tests/src/Drawing/PolyhedronTests.cs

@@ -1,196 +1,217 @@
 using System.Numerics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
+[TestFixture]
 public class PolyhedronTests
 {
-    [TestMethod]
+    [Test]
     public void AddVertices_ShouldAddVertices()
     {
         var polyhedron = Polyhedron.Empty;
         polyhedron.AddVertices(new[] {new Vector3(1, 2, 3), new Vector3(4, 5, 6)});
-        Assert.AreEqual(2, polyhedron.VertexCount);
 
-        // assert that the empty polyhedron was not modified
-        Assert.AreEqual(0, Polyhedron.Empty.VertexCount);
+        Assert.Multiple(() =>
+        {
+            Assert.That(polyhedron.VertexCount, Is.EqualTo(2));
+
+            // assert that the empty polyhedron was not modified
+            Assert.That(Polyhedron.Empty.VertexCount, Is.Zero);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void AddVertices_ShouldThrowArgumentNullException_GivenNullEnumerableOfVector3()
     {
         var polygon = Polyhedron.Empty;
         IEnumerable<Vector3> vertices = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => polygon.AddVertices(vertices));
+        Assert.Throws<ArgumentNullException>(() => polygon.AddVertices(vertices));
     }
 
-    [TestMethod]
+    [Test]
     public void ClearVertices_ShouldClearVertices()
     {
         var polyhedron = Polyhedron.Empty;
         polyhedron.AddVertices(new[] {new Vector3(1, 2, 3), new Vector3(4, 5, 6)});
-        Assert.AreEqual(2, polyhedron.VertexCount);
+        Assert.Multiple(() =>
+        {
+            Assert.That(polyhedron.VertexCount, Is.EqualTo(2));
 
-        // assert that the empty polyhedron was not modified
-        Assert.AreEqual(0, Polyhedron.Empty.VertexCount);
+            // assert that the empty polyhedron was not modified
+            Assert.That(Polyhedron.Empty.VertexCount, Is.Zero);
+        });
 
         polyhedron.ClearVertices();
-        Assert.AreEqual(0, polyhedron.VertexCount);
+        Assert.That(polyhedron.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldPopulateVertices_GivenPolyhedron()
     {
         var polyhedron = new Polyhedron(new[] {new Vector3(1, 2, 3), new Vector3(4, 5, 6)});
-        Assert.AreEqual(2, polyhedron.VertexCount);
+        Assert.That(polyhedron.VertexCount, Is.EqualTo(2));
     }
 
-    [TestMethod]
+    [Test]
     public void Constructor_ShouldThrowArgumentNullException_GivenNullEnumerableOfVector3()
     {
         IEnumerable<Vector3> vertices = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => new Polyhedron(vertices));
+        Assert.Throws<ArgumentNullException>(() => _ = new Polyhedron(vertices));
     }
 
-    [TestMethod]
+    [Test]
     public void CopyConstructor_ShouldCopyVertices_GivenPolyhedron()
     {
         var first = Polyhedron.Empty;
         first.AddVertices(new[] {new Vector3(1, 2, 3), new Vector3(4, 5, 6)});
 
         var second = new Polyhedron(first);
-        Assert.AreEqual(2, first.VertexCount);
-        Assert.AreEqual(2, second.VertexCount);
+        Assert.Multiple(() =>
+        {
+            Assert.That(first.VertexCount, Is.EqualTo(2));
+            Assert.That(second.VertexCount, Is.EqualTo(2));
 
-        // we cannot use CollectionAssert here for reasons I am not entirely sure of.
-        // it seems to dislike casting from IReadOnlyList<Point> to ICollection. but okay.
-        Assert.IsTrue(first.Vertices.SequenceEqual(second.Vertices));
+            // we cannot use CollectionAssert here for reasons I am not entirely sure of.
+            // it seems to dislike casting from IReadOnlyList<Point> to ICollection. but okay.
+            CollectionAssert.AreEqual(first.Vertices, second.Vertices);
 
-        // assert that the empty polyhedron was not modified
-        Assert.AreEqual(0, Polyhedron.Empty.VertexCount);
+            // assert that the empty polyhedron was not modified
+            Assert.That(Polyhedron.Empty.VertexCount, Is.Zero);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoEmptyPolyhedrons()
     {
         var first = Polyhedron.Empty;
         var second = Polyhedron.Empty;
 
-        Assert.AreEqual(first, second);
-        Assert.AreEqual(second, first);
-        Assert.IsTrue(first.Equals(second));
-        Assert.IsTrue(second.Equals(first));
-        Assert.IsTrue(first == second);
-        Assert.IsTrue(second == first);
-        Assert.IsFalse(first != second);
-        Assert.IsFalse(second != first);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.EqualTo(first));
+            Assert.That(first, Is.EqualTo(second));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoHexagons()
     {
-        Polyhedron first = CreateHexagon();
-        Polyhedron second = CreateHexagon();
+        Polyhedron first = CreateHexagonPolyhedron();
+        Polyhedron second = CreateHexagonPolyhedron();
 
-        Assert.AreEqual(first, second);
-        Assert.AreEqual(second, first);
-        Assert.IsTrue(first.Equals(second));
-        Assert.IsTrue(second.Equals(first));
-        Assert.IsTrue(first == second);
-        Assert.IsTrue(second == first);
-        Assert.IsFalse(first != second);
-        Assert.IsFalse(second != first);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.EqualTo(first));
+            Assert.That(first, Is.EqualTo(second));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenHexagonAndEmptyPolyhedron()
     {
-        Polyhedron first = CreateHexagon();
+        Polyhedron first = CreateHexagonPolyhedron();
         Polyhedron second = Polyhedron.Empty;
 
-        Assert.AreNotEqual(first, second);
-        Assert.AreNotEqual(second, first);
-        Assert.IsFalse(first.Equals(second));
-        Assert.IsFalse(second.Equals(first));
-        Assert.IsFalse(first == second);
-        Assert.IsFalse(second == first);
-        Assert.IsTrue(first != second);
-        Assert.IsTrue(second != first);
+        Assert.Multiple(() =>
+        {
+            Assert.That(second, Is.Not.EqualTo(first));
+            Assert.That(first, Is.Not.EqualTo(second));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void FromPolygon_ShouldThrowArgumentNullException_GivenNullPolygonF()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Polyhedron.FromPolygon(null!));
+        Assert.Throws<ArgumentNullException>(() => Polyhedron.FromPolygon(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void FromPolygonF_ShouldThrowArgumentNullException_GivenNullPolygonF()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => Polyhedron.FromPolygonF(null!));
+        Assert.Throws<ArgumentNullException>(() => Polyhedron.FromPolygonF(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentPolyhedron_GivenPolyhedron()
     {
         Polygon polygon = PolygonTests.CreateHexagon();
         Polyhedron converted = polygon;
 
-        Assert.AreEqual(polygon, converted);
-        Assert.AreEqual(polygon.VertexCount, converted.VertexCount);
-
-        Assert.IsTrue(converted.Vertices.SequenceEqual(polygon.Vertices.Select(p =>
+        Assert.Multiple(() =>
         {
-            var point = p.ToVector2();
-            return new Vector3(point.X, point.Y, 0);
-        })));
+            Assert.That(converted, Is.EqualTo((Polyhedron)polygon));
+            Assert.That(converted.VertexCount, Is.EqualTo(polygon.VertexCount));
+
+            CollectionAssert.AreEqual(converted.Vertices, polygon.Vertices.Select(p =>
+            {
+                var point = p.ToVector2();
+                return new Vector3(point.X, point.Y, 0);
+            }));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void op_Implicit_ShouldReturnEquivalentPolyhedron_GivenPolyhedronF()
     {
-        PolygonF polygon = PolygonFTests.CreateHexagon();
+        PolygonF polygon = CreateHexagonPolygon();
         Polyhedron converted = polygon;
 
-        Assert.AreEqual(polygon, converted);
-        Assert.AreEqual(polygon.VertexCount, converted.VertexCount);
-
-        Assert.IsTrue(converted.Vertices.SequenceEqual(polygon.Vertices.Select(v =>
+        Assert.Multiple(() =>
         {
-            var point = v.ToVector2();
-            return new Vector3(point.X, point.Y, 0);
-        })));
+            Assert.That(converted, Is.EqualTo((Polyhedron)polygon));
+            Assert.That(converted.VertexCount, Is.EqualTo(polygon.VertexCount));
+            CollectionAssert.AreEqual(converted.Vertices, polygon.Vertices.Select(p =>
+            {
+                var point = p.ToVector2();
+                return new Vector3(point.X, point.Y, 0);
+            }));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void PointCount_ShouldBe1_GivenPolyhedronWith1Point()
     {
         var polyhedron = new Polyhedron();
         polyhedron.AddVertex(Vector3.One);
 
-        Assert.AreEqual(1, polyhedron.VertexCount);
+        Assert.Multiple(() =>
+        {
+            Assert.That(polyhedron.VertexCount, Is.EqualTo(1));
 
-        // assert that the empty polyhedron was not modified
-        Assert.AreEqual(0, Polyhedron.Empty.VertexCount);
+            // assert that the empty polyhedron was not modified
+            Assert.That(Polyhedron.Empty.VertexCount, Is.Zero);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void PointCount_ShouldBe0_GivenEmptyPolyhedron()
     {
-        Assert.AreEqual(0, Polyhedron.Empty.VertexCount);
+        Assert.That(Polyhedron.Empty.VertexCount, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Polyhedron.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, Polyhedron.Empty.GetHashCode());
+        Assert.That(Polyhedron.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    internal static Polyhedron CreateHexagon()
+    private static PolygonF CreateHexagonPolygon()
+    {
+        var hexagon = new PolygonF();
+        hexagon.AddVertex(new Vector2(0, 0));
+        hexagon.AddVertex(new Vector2(1, 0));
+        hexagon.AddVertex(new Vector2(1, 1));
+        hexagon.AddVertex(new Vector2(0, 1));
+        hexagon.AddVertex(new Vector2(-1, 1));
+        hexagon.AddVertex(new Vector2(-1, 0));
+        return hexagon;
+    }
+
+    private static Polyhedron CreateHexagonPolyhedron()
     {
         var hexagon = new Polyhedron();
         hexagon.AddVertex(new Vector3(0, 0, 0));
@@ -202,7 +223,7 @@ public class PolyhedronTests
         return hexagon;
     }
 
-    internal static Polyhedron CreateConcavePolyhedron()
+    private static Polyhedron CreateConcavePolyhedron()
     {
         var hexagon = new Polyhedron();
         hexagon.AddVertex(new Vector3(0, 0, 0));

X10D.Tests/src/Drawing/RandomTests.cs

@@ -1,37 +1,37 @@
 using System.Drawing;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
+[TestFixture]
 public class RandomTests
 {
-    [TestMethod]
+    [Test]
     public void NextColorArgb_ShouldReturn331515e5_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(Color.FromArgb(51, 21, 21, 229), random.NextColorArgb());
+        Assert.That(random.NextColorArgb(), Is.EqualTo(Color.FromArgb(51, 21, 21, 229)));
     }
 
-    [TestMethod]
+    [Test]
     public void NextColorArgb_ShouldThrow_GivenNull()
     {
-        Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextColorArgb());
+        Random random = null!;
+        Assert.Throws<ArgumentNullException>(() => random.NextColorArgb());
     }
 
-    [TestMethod]
+    [Test]
     public void NextColorRgb_ShouldReturn1515e5_GivenSeed1234()
     {
         var random = new Random(1234);
-        Assert.AreEqual(Color.FromArgb(255, 21, 21, 229), random.NextColorRgb());
+        Assert.That(random.NextColorRgb(), Is.EqualTo(Color.FromArgb(255, 21, 21, 229)));
     }
 
-    [TestMethod]
+    [Test]
     public void NextColorRgb_ShouldThrow_GivenNull()
     {
-        Random? random = null;
-        Assert.ThrowsException<ArgumentNullException>(() => random!.NextColorRgb());
+        Random random = null!;
+        Assert.Throws<ArgumentNullException>(() => random.NextColorRgb());
     }
 }

X10D.Tests/src/Drawing/SizeTests.cs

@@ -1,42 +1,51 @@
 using System.Drawing;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
+[TestFixture]
 public class SizeTests
 {
-    [TestMethod]
+    [Test]
     public void ToPoint_ShouldReturnPoint_WithEquivalentMembers()
     {
         var random = new Random();
         var size = new Size(random.Next(), random.Next());
         var point = size.ToPoint();
 
-        Assert.AreEqual(size.Width, point.X);
-        Assert.AreEqual(size.Height, point.Y);
+        Assert.Multiple(() =>
+        {
+            Assert.That(point.X, Is.EqualTo(size.Width));
+            Assert.That(point.Y, Is.EqualTo(size.Height));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ToPointF_ShouldReturnPoint_WithEquivalentMembers()
     {
         var random = new Random();
         var size = new Size(random.Next(), random.Next());
         var point = size.ToPointF();
 
-        Assert.AreEqual(size.Width, point.X, 1e-6f);
-        Assert.AreEqual(size.Height, point.Y, 1e-6f);
+        Assert.Multiple(() =>
+        {
+            Assert.That(point.X, Is.EqualTo(size.Width).Within(1e-6f));
+            Assert.That(point.Y, Is.EqualTo(size.Height).Within(1e-6f));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ToVector2_ShouldReturnVector_WithEquivalentMembers()
     {
         var random = new Random();
         var point = new Size(random.Next(), random.Next());
         var size = point.ToVector2();
 
-        Assert.AreEqual(point.Width, size.X, 1e-6f);
-        Assert.AreEqual(point.Height, size.Y, 1e-6f);
+        Assert.Multiple(() =>
+        {
+            Assert.That(size.X, Is.EqualTo(point.Width).Within(1e-6f));
+            Assert.That(size.Y, Is.EqualTo(point.Height).Within(1e-6f));
+        });
     }
 }

X10D.Tests/src/Drawing/SphereTests.cs

@@ -1,135 +1,133 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
 
-[TestClass]
+[TestFixture]
 public class SphereTests
 {
-    [TestMethod]
+    [Test]
     public void Circumference_ShouldBe2PiRadius_GivenUnitCircle()
     {
         var unitSphere = Sphere.Unit;
-        Assert.AreEqual(2.0f * MathF.PI * unitSphere.Radius, unitSphere.Circumference, 1e-6f);
+        Assert.That(unitSphere.Circumference, Is.EqualTo(2.0f * MathF.PI * unitSphere.Radius).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenUnitCircleAndEmpty()
     {
-        Assert.AreEqual(-1, Sphere.Empty.CompareTo(Sphere.Unit));
+        Assert.That(Sphere.Empty.CompareTo(Sphere.Unit), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenUnitCircleAndEmpty()
     {
-        Assert.AreEqual(1, Sphere.Unit.CompareTo(Sphere.Empty));
+        Assert.That(Sphere.Unit.CompareTo(Sphere.Empty), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeNegativeOne_GivenEmptyCircleAndUnitCircleAsObject()
     {
-        Assert.AreEqual(-1, Sphere.Empty.CompareTo((object)Sphere.Unit));
+        Assert.That(Sphere.Empty.CompareTo((object)Sphere.Unit), Is.EqualTo(-1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeOne_GivenNull()
     {
-        Assert.AreEqual(1, Sphere.Unit.CompareTo(null));
+        Assert.That(Sphere.Unit.CompareTo(null), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldBeZero_GivenUnitCircle()
     {
         var unitCircle = Sphere.Unit;
-        Assert.AreEqual(0, unitCircle.CompareTo(unitCircle));
+        Assert.That(unitCircle.CompareTo(unitCircle), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void CompareTo_ShouldThrowArgumentException_GivenInvalidType()
     {
-        Assert.ThrowsException<ArgumentException>(() => Sphere.Unit.CompareTo(new object()));
+        Assert.Throws<ArgumentException>(() => _ = Sphere.Unit.CompareTo(new object()));
     }
 
-    [TestMethod]
+    [Test]
     public void Diameter_ShouldBe2_GivenUnitSphere()
     {
-        Assert.AreEqual(2.0f, Sphere.Unit.Diameter, 1e-6f);
+        Assert.That(Sphere.Unit.Diameter, Is.EqualTo(2.0f).Within(1e-6f));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeTrue_GivenTwoUnitCircles()
     {
         var unitCircle1 = Sphere.Unit;
         var unitCircle2 = Sphere.Unit;
-        Assert.AreEqual(unitCircle1, unitCircle2);
-        Assert.IsTrue(unitCircle1 == unitCircle2);
-        Assert.IsFalse(unitCircle1 != unitCircle2);
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(unitCircle2, Is.EqualTo(unitCircle1));
+            Assert.That(unitCircle1, Is.EqualTo(unitCircle2));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentObjects()
     {
-        Assert.IsFalse(Sphere.Unit.Equals(null));
+        Assert.That(Sphere.Unit, Is.Not.EqualTo(null));
     }
 
-    [TestMethod]
+    [Test]
     public void Equals_ShouldBeFalse_GivenDifferentCircles()
     {
-        Assert.AreNotEqual(Sphere.Unit, Sphere.Empty);
-        Assert.IsFalse(Sphere.Unit == Sphere.Empty);
-        Assert.IsTrue(Sphere.Unit != Sphere.Empty);
+        Assert.That(Sphere.Empty, Is.Not.EqualTo(Sphere.Unit));
+        Assert.That(Sphere.Unit, Is.Not.EqualTo(Sphere.Empty));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenEmptyCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Sphere.Empty.GetHashCode();
-        Assert.AreEqual(hashCode, Sphere.Empty.GetHashCode());
+        Assert.That(Sphere.Empty.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashCode_ShouldBeCorrect_GivenUnitCircle()
     {
         // this test is pretty pointless, it exists only for code coverage purposes
         int hashCode = Sphere.Unit.GetHashCode();
-        Assert.AreEqual(hashCode, Sphere.Unit.GetHashCode());
+        Assert.That(Sphere.Unit.GetHashCode(), Is.EqualTo(hashCode));
     }
 
-    [TestMethod]
+    [Test]
     public void op_GreaterThan_True_GivenUnitAndEmptyCircle()
     {
-        Assert.IsTrue(Sphere.Unit > Sphere.Empty);
-        Assert.IsTrue(Sphere.Unit >= Sphere.Empty);
-        Assert.IsFalse(Sphere.Unit < Sphere.Empty);
-        Assert.IsFalse(Sphere.Unit <= Sphere.Empty);
+        Assert.That(Sphere.Unit, Is.GreaterThan(Sphere.Empty));
+        Assert.That(Sphere.Unit, Is.GreaterThanOrEqualTo(Sphere.Empty));
     }
 
-    [TestMethod]
+    [Test]
     public void op_LessThan_True_GivenEmptyAndUnitCircle()
     {
-        Assert.IsTrue(Sphere.Empty < Sphere.Unit);
-        Assert.IsTrue(Sphere.Empty <= Sphere.Unit);
-        Assert.IsFalse(Sphere.Empty > Sphere.Unit);
-        Assert.IsFalse(Sphere.Empty >= Sphere.Unit);
+        Assert.That(Sphere.Empty, Is.LessThan(Sphere.Unit));
+        Assert.That(Sphere.Empty, Is.LessThanOrEqualTo(Sphere.Unit));
     }
 
-    [TestMethod]
+    [Test]
     public void Radius_ShouldBe0_GivenEmptySphere()
     {
-        Assert.AreEqual(0, Sphere.Empty.Radius);
+        Assert.That(Sphere.Empty.Radius, Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Radius_ShouldBe1_GivenUnitSphere()
     {
-        Assert.AreEqual(1, Sphere.Unit.Radius);
+        Assert.That(Sphere.Unit.Radius, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void Volume_ShouldBe4Over3TimesPi_GivenUnitCircle()
     {
         var unitSphere = Sphere.Unit;
-        Assert.AreEqual(4.0f / 3.0f * MathF.PI, unitSphere.Volume);
+        Assert.That(unitSphere.Volume, Is.EqualTo(4.0f / 3.0f * MathF.PI));
     }
 }

X10D.Tests/src/Hosting/ServiceCollectionTests.cs

@@ -1,14 +1,14 @@
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Hosting.DependencyInjection;
 
 namespace X10D.Tests.Hosting;
 
-[TestClass]
+[TestFixture]
 public class ServiceCollectionTests
 {
-    [TestMethod]
+    [Test]
     public void AddHostedSingleton_ShouldRegisterServiceAsSingletonAndAsHostedService()
     {
         var services = new ServiceCollection();
@@ -19,14 +19,17 @@ public class ServiceCollectionTests
         var service = serviceProvider.GetService<TestService>();
         var hostedService = serviceProvider.GetService<IHostedService>();
 
-        Assert.IsNotNull(service);
-        Assert.IsNotNull(hostedService);
-        Assert.IsInstanceOfType(service, typeof(TestService));
-        Assert.IsInstanceOfType(hostedService, typeof(TestService));
-        Assert.AreSame(service, hostedService);
+        Assert.Multiple(() =>
+        {
+            Assert.That(service, Is.Not.Null);
+            Assert.That(hostedService, Is.Not.Null);
+            Assert.IsAssignableFrom<TestService>(service);
+            Assert.IsAssignableFrom<TestService>(hostedService);
+            Assert.That(hostedService, Is.SameAs(service));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void AddHostedSingleton_ShouldRegisterServiceTypeAsSingletonAndAsHostedService()
     {
         var services = new ServiceCollection();
@@ -37,11 +40,14 @@ public class ServiceCollectionTests
         var service = serviceProvider.GetService<TestService>();
         var hostedService = serviceProvider.GetService<IHostedService>();
 
-        Assert.IsNotNull(service);
-        Assert.IsNotNull(hostedService);
-        Assert.IsInstanceOfType(service, typeof(TestService));
-        Assert.IsInstanceOfType(hostedService, typeof(TestService));
-        Assert.AreSame(service, hostedService);
+        Assert.Multiple(() =>
+        {
+            Assert.That(service, Is.Not.Null);
+            Assert.That(hostedService, Is.Not.Null);
+            Assert.IsAssignableFrom<TestService>(service);
+            Assert.IsAssignableFrom<TestService>(hostedService);
+            Assert.That(hostedService, Is.SameAs(service));
+        });
     }
 
     private sealed class TestService : IHostedService

X10D.Tests/src/IO/BooleanTests.cs

@@ -1,32 +1,32 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
+[TestFixture]
 public class BooleanTests
 {
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsArrayContaining1()
     {
         const bool value = true;
         CollectionAssert.AreEqual(new byte[] {1}, value.GetBytes());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanContaining1_GivenLargeEnoughSpan()
     {
         const bool value = true;
         Span<byte> buffer = stackalloc byte[1];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer));
         CollectionAssert.AreEqual(new byte[] {1}, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
     {
         const bool value = true;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/ByteTests.cs

@@ -1,32 +1,32 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
+[TestFixture]
 public class ByteTests
 {
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsArrayContainingItself()
     {
         const byte value = 0xFF;
         CollectionAssert.AreEqual(new[] {value}, value.GetBytes());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanContainingItself_GivenLargeEnoughSpan()
     {
         const byte value = 0xFF;
         Span<byte> buffer = stackalloc byte[1];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer));
         CollectionAssert.AreEqual(new[] {value}, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
     {
         const byte value = 0x0F;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/DirectoryInfoTests.cs

@@ -1,19 +1,19 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
+[TestFixture]
 public class DirectoryInfoTests
 {
-    [TestMethod]
+    [Test]
     public void Clear_ShouldClear_GivenValidDirectory()
     {
         string tempDirectoryPath = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
         var tempDirectory = new DirectoryInfo(tempDirectoryPath);
 
         tempDirectory.Create();
-        Assert.IsTrue(tempDirectory.Exists);
+        Assert.That(tempDirectory.Exists);
 
         var file = new FileInfo(Path.Combine(tempDirectory.FullName, "file"));
         file.Create().Close();
@@ -24,34 +24,42 @@ public class DirectoryInfoTests
         var childFile = new FileInfo(Path.Combine(childDirectory.FullName, "childFile"));
         childFile.Create().Close();
 
-        Assert.AreEqual(1, tempDirectory.GetFiles().Length);
-        Assert.AreEqual(1, tempDirectory.GetDirectories().Length);
+        Assert.Multiple(() =>
+        {
+            Assert.That(tempDirectory.GetFiles(), Has.Length.EqualTo(1));
+            Assert.That(tempDirectory.GetDirectories(), Has.Length.EqualTo(1));
+        });
+
         tempDirectory.Clear();
-        Assert.AreEqual(0, tempDirectory.GetFiles().Length);
-        Assert.AreEqual(0, tempDirectory.GetDirectories().Length);
-        Assert.IsTrue(tempDirectory.Exists);
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(tempDirectory.GetFiles(), Is.Empty);
+            Assert.That(tempDirectory.GetDirectories(), Is.Empty);
+            Assert.That(tempDirectory.Exists);
+        });
 
         tempDirectory.Delete();
     }
 
-    [TestMethod]
+    [Test]
     public void Clear_ShouldThrowArgumentNullException_GivenNull()
     {
-        Assert.ThrowsException<ArgumentNullException>(() => ((DirectoryInfo?)null)!.Clear());
+        Assert.Throws<ArgumentNullException>(() => ((DirectoryInfo?)null)!.Clear());
     }
 
-    [TestMethod]
+    [Test]
     public void Clear_ShouldThrowDirectoryNotFoundException_GivenInvalidDirectory()
     {
         var directory = new DirectoryInfo(@"123:/@12#3");
-        Assert.ThrowsException<DirectoryNotFoundException>(() => directory.Clear());
+        Assert.Throws<DirectoryNotFoundException>(() => directory.Clear());
     }
 
-    [TestMethod]
+    [Test]
     public void Clear_ShouldThrowDirectoryNotFoundException_GivenNonExistentDirectory()
     {
         var directory = new DirectoryInfo(@"/@12#3");
-        Assert.IsFalse(directory.Exists);
-        Assert.ThrowsException<DirectoryNotFoundException>(() => directory.Clear());
+        Assert.That(directory.Exists, Is.False);
+        Assert.Throws<DirectoryNotFoundException>(() => directory.Clear());
     }
 }

X10D.Tests/src/IO/DoubleTests.cs

@@ -1,12 +1,12 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
+[TestFixture]
 public class DoubleTests
 {
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsCorrectValue()
     {
         const double value = 42.5;
@@ -16,7 +16,7 @@ public class DoubleTests
         CollectionAssert.AreEqual(bytes, value.GetBytes());
     }
 
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsCorrectValue_WithEndianness()
     {
         const double value = 42.5;
@@ -27,7 +27,7 @@ public class DoubleTests
         CollectionAssert.AreEqual(bigEndian, value.GetBytes(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan()
     {
         const double value = 42.5;
@@ -36,11 +36,11 @@ public class DoubleTests
             : new byte[] {0x40, 0x45, 0x40, 0, 0, 0, 0, 0};
 
         Span<byte> buffer = stackalloc byte[8];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer));
         CollectionAssert.AreEqual(bytes, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan_WithEndianness()
     {
         const double value = 42.5;
@@ -49,18 +49,18 @@ public class DoubleTests
 
         Span<byte> buffer = stackalloc byte[8];
 
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.LittleEndian));
+        Assert.That(value.TryWriteBytes(buffer, Endianness.LittleEndian));
         CollectionAssert.AreEqual(littleEndian, buffer.ToArray());
 
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.BigEndian));
+        Assert.That(value.TryWriteBytes(buffer, Endianness.BigEndian));
         CollectionAssert.AreEqual(bigEndian, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
     {
         const double value = 42.5;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/FileInfoTests.cs

@@ -1,23 +1,23 @@
 using System.Security.Cryptography;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
+[TestFixture]
 public class FileInfoTests
 {
-    [TestMethod]
+    [Test]
     public void GetHashSha1ShouldBeCorrect()
     {
-        string fileName = $"temp.{DateTimeOffset.Now.ToUnixTimeSeconds()}.bin";
+        var fileName = $"temp.{DateTimeOffset.Now.ToUnixTimeSeconds()}.bin";
         if (File.Exists(fileName))
         {
             Assert.Fail("Temporary file already exists");
         }
 
         File.WriteAllText(fileName, "Hello World");
-        Assert.IsTrue(File.Exists(fileName));
+        Assert.That(File.Exists(fileName));
 
         // SHA-1
         byte[] expectedHash =
@@ -37,17 +37,17 @@ public class FileInfoTests
         }
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteHashSha1ShouldBeCorrect()
     {
-        string fileName = $"temp.{DateTimeOffset.Now.ToUnixTimeSeconds()}.bin";
+        var fileName = $"temp.{DateTimeOffset.Now.ToUnixTimeSeconds()}.bin";
         if (File.Exists(fileName))
         {
             Assert.Fail("Temporary file already exists");
         }
 
         File.WriteAllText(fileName, "Hello World");
-        Assert.IsTrue(File.Exists(fileName));
+        Assert.That(File.Exists(fileName));
 
         // SHA-1
         byte[] expectedHash =
@@ -60,7 +60,7 @@ public class FileInfoTests
         {
             Span<byte> hash = stackalloc byte[20];
             new FileInfo(fileName).TryWriteHash<SHA1>(hash, out int bytesWritten);
-            Assert.AreEqual(expectedHash.Length, bytesWritten);
+            Assert.That(bytesWritten, Is.EqualTo(expectedHash.Length));
             CollectionAssert.AreEqual(expectedHash, hash.ToArray());
         }
         finally
@@ -69,25 +69,25 @@ public class FileInfoTests
         }
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashNullShouldThrow()
     {
         // any HashAlgorithm will do, but SHA1 is used above. so to remain consistent, we use it here
-        Assert.ThrowsException<ArgumentNullException>(() => ((FileInfo?)null)!.GetHash<SHA1>());
-        Assert.ThrowsException<ArgumentNullException>(() => ((FileInfo?)null)!.TryWriteHash<SHA1>(Span<byte>.Empty, out _));
+        Assert.Throws<ArgumentNullException>(() => _ = ((FileInfo?)null)!.GetHash<SHA1>());
+        Assert.Throws<ArgumentNullException>(() => ((FileInfo?)null)!.TryWriteHash<SHA1>(Span<byte>.Empty, out _));
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashInvalidFileShouldThrow()
     {
-        string fileName = $"temp.{DateTimeOffset.Now.ToUnixTimeSeconds()}.bin";
+        var fileName = $"temp.{DateTimeOffset.Now.ToUnixTimeSeconds()}.bin";
         if (File.Exists(fileName))
         {
             Assert.Fail("Temporary file already exists");
         }
 
         // any HashAlgorithm will do, but SHA1 is used above. so to remain consistent, we use it here
-        Assert.ThrowsException<FileNotFoundException>(() => new FileInfo(fileName).GetHash<SHA1>());
-        Assert.ThrowsException<FileNotFoundException>(() => new FileInfo(fileName).TryWriteHash<SHA1>(Span<byte>.Empty, out _));
+        Assert.Throws<FileNotFoundException>(() => _ = new FileInfo(fileName).GetHash<SHA1>());
+        Assert.Throws<FileNotFoundException>(() => new FileInfo(fileName).TryWriteHash<SHA1>(Span<byte>.Empty, out _));
     }
 }

X10D.Tests/src/IO/Int16Tests.cs

@@ -1,12 +1,12 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
+[TestFixture]
 public class Int16Tests
 {
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsCorrectValue()
     {
         const short value = 0x0F;
@@ -14,7 +14,7 @@ public class Int16Tests
         CollectionAssert.AreEqual(bytes, value.GetBytes());
     }
 
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsCorrectValue_WithEndianness()
     {
         const short value = 0x0F;
@@ -25,18 +25,18 @@ public class Int16Tests
         CollectionAssert.AreEqual(bigEndian, value.GetBytes(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan()
     {
         const short value = 0x0F;
         byte[] bytes = BitConverter.IsLittleEndian ? new byte[] {0x0F, 0} : new byte[] {0, 0x0F};
 
         Span<byte> buffer = stackalloc byte[2];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer));
         CollectionAssert.AreEqual(bytes, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan_WithEndianness()
     {
         const short value = 0x0F;
@@ -45,18 +45,18 @@ public class Int16Tests
 
         Span<byte> buffer = stackalloc byte[2];
 
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.LittleEndian));
+        Assert.That(value.TryWriteBytes(buffer, Endianness.LittleEndian));
         CollectionAssert.AreEqual(littleEndian, buffer.ToArray());
 
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.BigEndian));
+        Assert.That(value.TryWriteBytes(buffer, Endianness.BigEndian));
         CollectionAssert.AreEqual(bigEndian, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
     {
         const short value = 0x0F;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/Int32Tests.cs

@@ -1,12 +1,12 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
+[TestFixture]
 public class Int32Tests
 {
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsCorrectValue()
     {
         const int value = 0x0F;
@@ -14,7 +14,7 @@ public class Int32Tests
         CollectionAssert.AreEqual(bytes, value.GetBytes());
     }
 
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsCorrectValue_WithEndianness()
     {
         const int value = 0x0F;
@@ -25,18 +25,18 @@ public class Int32Tests
         CollectionAssert.AreEqual(bigEndian, value.GetBytes(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan()
     {
         const int value = 0x0F;
         byte[] bytes = BitConverter.IsLittleEndian ? new byte[] {0x0F, 0, 0, 0} : new byte[] {0, 0, 0, 0x0F};
 
         Span<byte> buffer = stackalloc byte[4];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer));
         CollectionAssert.AreEqual(bytes, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan_WithEndianness()
     {
         const int value = 0x0F;
@@ -45,18 +45,18 @@ public class Int32Tests
 
         Span<byte> buffer = stackalloc byte[4];
 
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.LittleEndian));
+        Assert.That(value.TryWriteBytes(buffer, Endianness.LittleEndian));
         CollectionAssert.AreEqual(littleEndian, buffer.ToArray());
 
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.BigEndian));
+        Assert.That(value.TryWriteBytes(buffer, Endianness.BigEndian));
         CollectionAssert.AreEqual(bigEndian, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
     {
         const int value = 0x0F;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/Int64Tests.cs

@@ -1,12 +1,12 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
+[TestFixture]
 public class Int64Tests
 {
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsCorrectValue()
     {
         const long value = 0x0F;
@@ -16,7 +16,7 @@ public class Int64Tests
         CollectionAssert.AreEqual(bytes, value.GetBytes());
     }
 
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsCorrectValue_WithEndianness()
     {
         const long value = 0x0F;
@@ -27,7 +27,7 @@ public class Int64Tests
         CollectionAssert.AreEqual(bigEndian, value.GetBytes(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan()
     {
         const long value = 0x0F;
@@ -36,11 +36,11 @@ public class Int64Tests
             : new byte[] {0, 0, 0, 0, 0, 0, 0, 0x0F};
 
         Span<byte> buffer = stackalloc byte[8];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer));
         CollectionAssert.AreEqual(bytes, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan_WithEndianness()
     {
         const long value = 0x0F;
@@ -49,18 +49,18 @@ public class Int64Tests
 
         Span<byte> buffer = stackalloc byte[8];
 
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.LittleEndian));
+        Assert.That(value.TryWriteBytes(buffer, Endianness.LittleEndian));
         CollectionAssert.AreEqual(littleEndian, buffer.ToArray());
 
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.BigEndian));
+        Assert.That(value.TryWriteBytes(buffer, Endianness.BigEndian));
         CollectionAssert.AreEqual(bigEndian, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
     {
         const long value = 0x0F;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/ListOfByteTests.cs

@@ -1,27 +1,27 @@
 using System.Text;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
+[TestFixture]
 public class ListOfByteTests
 {
-    [TestMethod]
+    [Test]
     public void AsString_ShouldReturnBytes_GivenBytes()
     {
         var bytes = new byte[] {0x01, 0x02, 0x03, 0x04, 0x05};
-        Assert.AreEqual("01-02-03-04-05", bytes.AsString());
+        Assert.That(bytes.AsString(), Is.EqualTo("01-02-03-04-05"));
     }
 
-    [TestMethod]
+    [Test]
     public void AsString_ShouldThrow_GivenNullArray()
     {
         byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.AsString());
+        Assert.Throws<ArgumentNullException>(() => bytes!.AsString());
     }
 
-    [TestMethod]
+    [Test]
     public void ToDouble_ShouldReturnDouble_GivenBytes()
     {
         var bytes = new byte[] {0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x7A, 0x40};
@@ -31,59 +31,59 @@ public class ListOfByteTests
             Array.Reverse(bytes);
         }
 
-        Assert.AreEqual(420.0, bytes.ToDouble(), 1e-6);
+        Assert.That(bytes.ToDouble(), Is.EqualTo(420.0).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void ToDouble_ShouldThrow_GivenNullArray()
     {
-        byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToDouble());
+        byte[] bytes = null!;
+        Assert.Throws<ArgumentNullException>(() => bytes.ToDouble());
     }
 
-    [TestMethod]
+    [Test]
     public void ToInt16_ShouldReturnInt16_GivenBytes()
     {
         var bytes = new byte[] {0xA4, 0x01};
-        Assert.AreEqual(420, bytes.ToInt16());
+        Assert.That(bytes.ToInt16(), Is.EqualTo(420));
     }
 
-    [TestMethod]
+    [Test]
     public void ToInt16_ShouldThrow_GivenNullArray()
     {
-        byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToInt16());
+        byte[] bytes = null!;
+        Assert.Throws<ArgumentNullException>(() => bytes.ToInt16());
     }
 
-    [TestMethod]
+    [Test]
     public void ToInt32_ShouldReturnInt32_GivenBytes()
     {
         var bytes = new byte[] {0xA4, 0x01, 0x00, 0x00};
-        Assert.AreEqual(420, bytes.ToInt32());
+        Assert.That(bytes.ToInt32(), Is.EqualTo(420));
     }
 
-    [TestMethod]
+    [Test]
     public void ToInt32_ShouldThrow_GivenNullArray()
     {
-        byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToInt32());
+        byte[] bytes = null!;
+        Assert.Throws<ArgumentNullException>(() => bytes.ToInt32());
     }
 
-    [TestMethod]
+    [Test]
     public void ToInt64_ShouldReturnInt32_GivenBytes()
     {
         var bytes = new byte[] {0xA4, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
-        Assert.AreEqual(420L, bytes.ToInt64());
+        Assert.That(bytes.ToInt64(), Is.EqualTo(420L));
     }
 
-    [TestMethod]
+    [Test]
     public void ToInt64_ShouldThrow_GivenNullArray()
     {
         byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToInt64());
+        Assert.Throws<ArgumentNullException>(() => bytes!.ToInt64());
     }
 
-    [TestMethod]
+    [Test]
     public void ToSingle_ShouldReturnDouble_GivenBytes()
     {
         var bytes = new byte[] {0x00, 0x00, 0xD2, 0x43};
@@ -93,76 +93,76 @@ public class ListOfByteTests
             Array.Reverse(bytes);
         }
 
-        Assert.AreEqual(420.0, bytes.ToSingle(), 1e-6);
+        Assert.That(bytes.ToSingle(), Is.EqualTo(420.0).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void ToSingle_ShouldThrow_GivenNullArray()
     {
-        byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToSingle());
+        byte[] bytes = null!;
+        Assert.Throws<ArgumentNullException>(() => bytes.ToSingle());
     }
 
-    [TestMethod]
+    [Test]
     public void ToString_ShouldReturnHelloWorld_GivenUTF8()
     {
         var bytes = new byte[] {0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x20, 0x57, 0x6F, 0x72, 0x6C, 0x64};
-        Assert.AreEqual("Hello World", bytes.ToString(Encoding.UTF8));
+        Assert.That(bytes.ToString(Encoding.UTF8), Is.EqualTo("Hello World"));
     }
 
-    [TestMethod]
+    [Test]
     public void ToString_ShouldThrow_GivenNullArray()
     {
-        byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToString(Encoding.UTF8));
+        byte[] bytes = null!;
+        Assert.Throws<ArgumentNullException>(() => bytes.ToString(Encoding.UTF8));
     }
 
-    [TestMethod]
+    [Test]
     public void ToString_ShouldThrow_GivenNullEncoding()
     {
         var bytes = new byte[] {0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x20, 0x57, 0x6F, 0x72, 0x6C, 0x64};
-        Assert.ThrowsException<ArgumentNullException>(() => bytes.ToString(null!));
+        Assert.Throws<ArgumentNullException>(() => bytes.ToString(null!));
     }
 
-    [TestMethod]
+    [Test]
     public void ToUInt16_ShouldReturnInt16_GivenBytes()
     {
         var bytes = new byte[] {0xA4, 0x01};
-        Assert.AreEqual((ushort)420, bytes.ToUInt16());
+        Assert.That(bytes.ToUInt16(), Is.EqualTo((ushort)420));
     }
 
-    [TestMethod]
+    [Test]
     public void ToUInt16_ShouldThrow_GivenNullArray()
     {
-        byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToUInt16());
+        byte[] bytes = null!;
+        Assert.Throws<ArgumentNullException>(() => bytes.ToUInt16());
     }
 
-    [TestMethod]
+    [Test]
     public void ToUInt32_ShouldReturnInt32_GivenBytes()
     {
         var bytes = new byte[] {0xA4, 0x01, 0x00, 0x00};
-        Assert.AreEqual(420U, bytes.ToUInt32());
+        Assert.That(bytes.ToUInt32(), Is.EqualTo(420U));
     }
 
-    [TestMethod]
+    [Test]
     public void ToUInt32_ShouldThrow_GivenNullArray()
     {
         byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToUInt32());
+        Assert.Throws<ArgumentNullException>(() => bytes!.ToUInt32());
     }
 
-    [TestMethod]
+    [Test]
     public void ToUInt64_ShouldReturnInt32_GivenBytes()
     {
         var bytes = new byte[] {0xA4, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
-        Assert.AreEqual(420UL, bytes.ToUInt64());
+        Assert.That(bytes.ToUInt64(), Is.EqualTo(420UL));
     }
 
-    [TestMethod]
+    [Test]
     public void ToUInt64_ShouldThrow_GivenNullArray()
     {
-        byte[]? bytes = null;
-        Assert.ThrowsException<ArgumentNullException>(() => bytes!.ToUInt64());
+        byte[] bytes = null!;
+        Assert.Throws<ArgumentNullException>(() => bytes.ToUInt64());
     }
 }

X10D.Tests/src/IO/SByteTests.cs

@@ -1,33 +1,33 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
+[TestFixture]
 [CLSCompliant(false)]
 public class SByteTests
 {
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsArrayContainingItself()
     {
         const sbyte value = 0x0F;
         CollectionAssert.AreEqual(new[] {(byte)value}, value.GetBytes());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanContainingItself_GivenLargeEnoughSpan()
     {
         const sbyte value = 0x0F;
         Span<byte> buffer = stackalloc byte[1];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer));
         CollectionAssert.AreEqual(new[] {(byte)value}, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
     {
         const sbyte value = 0x0F;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/SingleTests.cs

@@ -1,12 +1,12 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
+[TestFixture]
 public class SingleTests
 {
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsCorrectValue()
     {
         const float value = 42.5f;
@@ -16,7 +16,7 @@ public class SingleTests
         CollectionAssert.AreEqual(bytes, value.GetBytes());
     }
 
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsCorrectValue_WithEndianness()
     {
         const float value = 42.5f;
@@ -27,7 +27,7 @@ public class SingleTests
         CollectionAssert.AreEqual(bigEndian, value.GetBytes(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan()
     {
         const float value = 42.5f;
@@ -36,11 +36,11 @@ public class SingleTests
             : new byte[] {0x42, 0x2A, 0, 0};
 
         Span<byte> buffer = stackalloc byte[4];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer));
         CollectionAssert.AreEqual(bytes, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan_WithEndianness()
     {
         const float value = 42.5f;
@@ -49,18 +49,18 @@ public class SingleTests
 
         Span<byte> buffer = stackalloc byte[4];
 
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.LittleEndian));
+        Assert.That(value.TryWriteBytes(buffer, Endianness.LittleEndian));
         CollectionAssert.AreEqual(littleEndian, buffer.ToArray());
 
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.BigEndian));
+        Assert.That(value.TryWriteBytes(buffer, Endianness.BigEndian));
         CollectionAssert.AreEqual(bigEndian, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
     {
         const float value = 42.5f;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/StreamTests.ReadDecimal.cs

@@ -1,29 +1,29 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     public void ReadDecimal_ShouldThrowArgumentException_GivenNonReadableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadDecimal());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadDecimal(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadDecimal(Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadDecimal());
+        Assert.Throws<ArgumentException>(() => stream.ReadDecimal(Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadDecimal(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadDecimal_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadDecimal());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadDecimal(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadDecimal(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadDecimal());
+        Assert.Throws<ArgumentNullException>(() => stream.ReadDecimal(Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadDecimal(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadDecimal_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
         // we don't need to enclose this stream in a using declaration, since disposing a
@@ -32,10 +32,10 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadDecimal((Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.ReadDecimal((Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadDecimal_ShouldReadBigEndian_GivenBigEndian()
     {
         using var stream = new MemoryStream();
@@ -49,11 +49,14 @@ public partial class StreamTests
         const decimal expected = 420.0m;
         decimal actual = stream.ReadDecimal(Endianness.BigEndian);
 
-        Assert.AreEqual(16, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.Multiple(() =>
+        {
+            Assert.That(stream.Position, Is.EqualTo(16));
+            Assert.That(actual, Is.EqualTo(expected));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ReadDecimal_ShouldWriteLittleEndian_GivenLittleEndian()
     {
         using var stream = new MemoryStream();
@@ -67,7 +70,10 @@ public partial class StreamTests
         const decimal expected = 420.0m;
         decimal actual = stream.ReadDecimal(Endianness.LittleEndian);
 
-        Assert.AreEqual(16, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.Multiple(() =>
+        {
+            Assert.That(stream.Position, Is.EqualTo(16));
+            Assert.That(actual, Is.EqualTo(expected));
+        });
     }
 }

X10D.Tests/src/IO/StreamTests.ReadDouble.cs

@@ -1,29 +1,29 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     public void ReadDouble_ShouldThrowArgumentException_GivenNonReadableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadDouble());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadDouble(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadDouble(Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadDouble());
+        Assert.Throws<ArgumentException>(() => stream.ReadDouble(Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadDouble(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadDouble_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadDouble());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadDouble(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadDouble(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadDouble());
+        Assert.Throws<ArgumentNullException>(() => stream.ReadDouble(Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadDouble(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadDouble_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
         // we don't need to enclose this stream in a using declaration, since disposing a
@@ -32,10 +32,10 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadDouble((Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.ReadDouble((Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadDouble_ShouldReadBigEndian_GivenBigEndian()
     {
         using var stream = new MemoryStream();
@@ -46,11 +46,11 @@ public partial class StreamTests
         const double expected = 420.0;
         double actual = stream.ReadDouble(Endianness.BigEndian);
 
-        Assert.AreEqual(8, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(8));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadDouble_ShouldWriteLittleEndian_GivenLittleEndian()
     {
         using var stream = new MemoryStream();
@@ -61,7 +61,7 @@ public partial class StreamTests
         const double expected = 420.0;
         double actual = stream.ReadDouble(Endianness.LittleEndian);
 
-        Assert.AreEqual(8, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(8));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 }

X10D.Tests/src/IO/StreamTests.ReadInt16.cs

@@ -1,29 +1,29 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     public void ReadInt16_ShouldThrowArgumentException_GivenNonReadableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt16());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt16(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt16(Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadInt16());
+        Assert.Throws<ArgumentException>(() => stream.ReadInt16(Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadInt16(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadInt16_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt16());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt16(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt16(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadInt16());
+        Assert.Throws<ArgumentNullException>(() => stream.ReadInt16(Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadInt16(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadInt16_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
         // we don't need to enclose this stream in a using declaration, since disposing a
@@ -32,10 +32,10 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadInt16((Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.ReadInt16((Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadInt16_ShouldReadBigEndian_GivenBigEndian()
     {
         using var stream = new MemoryStream();
@@ -46,11 +46,11 @@ public partial class StreamTests
         const short expected = 420;
         short actual = stream.ReadInt16(Endianness.BigEndian);
 
-        Assert.AreEqual(2, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(2));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadInt16_ShouldReadLittleEndian_GivenLittleEndian()
     {
         using var stream = new MemoryStream();
@@ -61,7 +61,7 @@ public partial class StreamTests
         const short expected = 420;
         short actual = stream.ReadInt16(Endianness.LittleEndian);
 
-        Assert.AreEqual(2, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(2));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 }

X10D.Tests/src/IO/StreamTests.ReadInt32.cs

@@ -1,29 +1,29 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     public void ReadInt32_ShouldThrowArgumentException_GivenNonReadableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt32());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt32(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt32(Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadInt32());
+        Assert.Throws<ArgumentException>(() => stream.ReadInt32(Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadInt32(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadInt32_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt32());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt32(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt32(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadInt32());
+        Assert.Throws<ArgumentNullException>(() => stream.ReadInt32(Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadInt32(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadInt32_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
         // we don't need to enclose this stream in a using declaration, since disposing a
@@ -32,10 +32,10 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadInt32((Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.ReadInt32((Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadInt32_ShouldReadBigEndian_GivenBigEndian()
     {
         using var stream = new MemoryStream();
@@ -46,11 +46,11 @@ public partial class StreamTests
         const int expected = 420;
         int actual = stream.ReadInt32(Endianness.BigEndian);
 
-        Assert.AreEqual(4, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(4));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadInt32_ShouldReadLittleEndian_GivenLittleEndian()
     {
         using var stream = new MemoryStream();
@@ -61,7 +61,7 @@ public partial class StreamTests
         const int expected = 420;
         int actual = stream.ReadInt32(Endianness.LittleEndian);
 
-        Assert.AreEqual(4, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(4));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 }

X10D.Tests/src/IO/StreamTests.ReadInt64.cs

@@ -1,29 +1,29 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     public void ReadInt64_ShouldThrowArgumentException_GivenNonReadableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt64());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt64(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadInt64(Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadInt64());
+        Assert.Throws<ArgumentException>(() => stream.ReadInt64(Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadInt64(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadInt64_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt64());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt64(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadInt64(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadInt64());
+        Assert.Throws<ArgumentNullException>(() => stream.ReadInt64(Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadInt64(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadInt64_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
         // we don't need to enclose this stream in a using declaration, since disposing a
@@ -32,10 +32,10 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadInt64((Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.ReadInt64((Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadInt64_ShouldReadBigEndian_GivenBigEndian()
     {
         using var stream = new MemoryStream();
@@ -46,11 +46,11 @@ public partial class StreamTests
         const long expected = 420;
         long actual = stream.ReadInt64(Endianness.BigEndian);
 
-        Assert.AreEqual(8, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(8));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadInt64_ShouldWriteLittleEndian_GivenLittleEndian()
     {
         using var stream = new MemoryStream();
@@ -61,7 +61,7 @@ public partial class StreamTests
         const long expected = 420;
         long actual = stream.ReadInt64(Endianness.LittleEndian);
 
-        Assert.AreEqual(8, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(8));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 }

X10D.Tests/src/IO/StreamTests.ReadSingle.cs

@@ -1,29 +1,29 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     public void ReadSingle_ShouldThrowArgumentException_GivenNonReadableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadSingle());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadSingle(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadSingle(Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadSingle());
+        Assert.Throws<ArgumentException>(() => stream.ReadSingle(Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadSingle(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadSingle_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadSingle());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadSingle(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadSingle(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadSingle());
+        Assert.Throws<ArgumentNullException>(() => stream.ReadSingle(Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadSingle(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadSingle_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
         // we don't need to enclose this stream in a using declaration, since disposing a
@@ -32,10 +32,10 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadSingle((Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.ReadSingle((Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadSingle_ShouldReadBigEndian_GivenBigEndian()
     {
         using var stream = new MemoryStream();
@@ -46,11 +46,11 @@ public partial class StreamTests
         const float expected = 420.0f;
         float actual = stream.ReadSingle(Endianness.BigEndian);
 
-        Assert.AreEqual(4, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(4));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void ReadSingle_ShouldReadLittleEndian_GivenLittleEndian()
     {
         using var stream = new MemoryStream();
@@ -61,7 +61,7 @@ public partial class StreamTests
         const float expected = 420.0f;
         float actual = stream.ReadSingle(Endianness.LittleEndian);
 
-        Assert.AreEqual(4, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(4));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 }

X10D.Tests/src/IO/StreamTests.ReadUInt16.cs

@@ -1,31 +1,31 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void ReadUInt16_ShouldThrowArgumentException_GivenNonReadableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt16());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt16(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt16(Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadUInt16());
+        Assert.Throws<ArgumentException>(() => stream.ReadUInt16(Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadUInt16(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void ReadUInt16_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt16());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt16(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt16(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadUInt16());
+        Assert.Throws<ArgumentNullException>(() => stream.ReadUInt16(Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadUInt16(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void ReadUInt16_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
@@ -35,10 +35,10 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadUInt16((Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.ReadUInt16((Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void ReadUInt16_ShouldReadBigEndian_GivenBigEndian()
     {
@@ -50,11 +50,11 @@ public partial class StreamTests
         const ushort expected = 420;
         ushort actual = stream.ReadUInt16(Endianness.BigEndian);
 
-        Assert.AreEqual(2, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(2));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void ReadUInt16_ShouldReadLittleEndian_GivenLittleEndian()
     {
@@ -66,7 +66,7 @@ public partial class StreamTests
         const ushort expected = 420;
         ushort actual = stream.ReadUInt16(Endianness.LittleEndian);
 
-        Assert.AreEqual(2, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(2));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 }

X10D.Tests/src/IO/StreamTests.ReadUInt32.cs

@@ -1,31 +1,31 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void ReadUInt32_ShouldThrowArgumentException_GivenNonReadableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt32());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt32(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt32(Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadUInt32());
+        Assert.Throws<ArgumentException>(() => stream.ReadUInt32(Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadUInt32(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void ReadUInt32_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt32());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt32(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt32(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadUInt32());
+        Assert.Throws<ArgumentNullException>(() => stream.ReadUInt32(Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadUInt32(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void ReadUInt32_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
@@ -35,10 +35,10 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadUInt32((Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.ReadUInt32((Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void ReadUInt32_ShouldReadBigEndian_GivenBigEndian()
     {
@@ -50,11 +50,11 @@ public partial class StreamTests
         const uint expected = 420;
         uint actual = stream.ReadUInt32(Endianness.BigEndian);
 
-        Assert.AreEqual(4, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(4));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void ReadUInt32_ShouldReadLittleEndian_GivenLittleEndian()
     {
@@ -66,7 +66,7 @@ public partial class StreamTests
         const uint expected = 420;
         uint actual = stream.ReadUInt32(Endianness.LittleEndian);
 
-        Assert.AreEqual(4, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(4));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 }

X10D.Tests/src/IO/StreamTests.ReadUInt64.cs

@@ -1,31 +1,31 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void ReadUInt64_ShouldThrowArgumentException_GivenNonReadableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt64());
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt64(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.ReadUInt64(Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadUInt64());
+        Assert.Throws<ArgumentException>(() => stream.ReadUInt64(Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.ReadUInt64(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void ReadUInt64_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt64());
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt64(Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.ReadUInt64(Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadUInt64());
+        Assert.Throws<ArgumentNullException>(() => stream.ReadUInt64(Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.ReadUInt64(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void ReadUInt64_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
@@ -35,10 +35,10 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.ReadUInt64((Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.ReadUInt64((Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void ReadUInt64_ShouldReadBigEndian_GivenBigEndian()
     {
@@ -50,11 +50,11 @@ public partial class StreamTests
         const ulong expected = 420;
         ulong actual = stream.ReadUInt64(Endianness.BigEndian);
 
-        Assert.AreEqual(8, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(8));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void ReadUInt64_ShouldWriteLittleEndian_GivenLittleEndian()
     {
@@ -66,7 +66,7 @@ public partial class StreamTests
         const ulong expected = 420;
         ulong actual = stream.ReadUInt64(Endianness.LittleEndian);
 
-        Assert.AreEqual(8, stream.Position);
-        Assert.AreEqual(expected, actual);
+        Assert.That(stream.Position, Is.EqualTo(8));
+        Assert.That(actual, Is.EqualTo(expected));
     }
 }

X10D.Tests/src/IO/StreamTests.WriteDecimal.cs

@@ -1,28 +1,28 @@
 using System.Diagnostics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     public void WriteDecimal_ShouldThrowArgumentException_GivenNonWriteableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420.0m, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420.0m, Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write(420.0m, Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write(420.0m, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteDecimal_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420.0m, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420.0m, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write(420.0m, Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write(420.0m, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteDecimal_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
         // we don't need to enclose this stream in a using declaration, since disposing a
@@ -31,16 +31,16 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420.0m, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420.0m, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write(420.0m, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write(420.0m, (Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteDecimal_ShouldWriteBigEndian_GivenBigEndian()
     {
         using var stream = new MemoryStream();
         stream.Write(420.0m, Endianness.BigEndian);
-        Assert.AreEqual(16, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(16));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[16];
@@ -50,16 +50,16 @@ public partial class StreamTests
         };
         int read = stream.Read(actual);
 
-        Assert.AreEqual(16, read);
+        Assert.That(read, Is.EqualTo(16));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void WriteDecimal_ShouldWriteLittleEndian_GivenLittleEndian()
     {
         using var stream = new MemoryStream();
         stream.Write(420.0m, Endianness.LittleEndian);
-        Assert.AreEqual(16, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(16));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[16];
@@ -71,7 +71,7 @@ public partial class StreamTests
 
         Trace.WriteLine(string.Join(", ", actual.ToArray().Select(b => $"0x{b:X2}")));
 
-        Assert.AreEqual(16, read);
+        Assert.That(read, Is.EqualTo(16));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.WriteDouble.cs

@@ -1,27 +1,27 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     public void WriteDouble_ShouldThrowArgumentException_GivenNonWriteableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420.0, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420.0, Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write(420.0, Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write(420.0, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteDouble_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420.0, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420.0, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write(420.0, Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write(420.0, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteDouble_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
         // we don't need to enclose this stream in a using declaration, since disposing a
@@ -30,39 +30,39 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420.0, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420.0, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write(420.0, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write(420.0, (Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteDouble_ShouldWriteBigEndian_GivenBigEndian()
     {
         using var stream = new MemoryStream();
         stream.Write(420.0, Endianness.BigEndian);
-        Assert.AreEqual(8, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(8));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[8];
         ReadOnlySpan<byte> expected = stackalloc byte[] {0x40, 0x7A, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00};
         int read = stream.Read(actual);
 
-        Assert.AreEqual(8, read);
+        Assert.That(read, Is.EqualTo(8));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void WriteDouble_ShouldWriteLittleEndian_GivenLittleEndian()
     {
         using var stream = new MemoryStream();
         stream.Write(420.0, Endianness.LittleEndian);
-        Assert.AreEqual(8, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(8));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[8];
         ReadOnlySpan<byte> expected = stackalloc byte[] {0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x7A, 0x40};
         int read = stream.Read(actual);
 
-        Assert.AreEqual(8, read);
+        Assert.That(read, Is.EqualTo(8));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.WriteInt16.cs

@@ -1,27 +1,27 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     public void WriteInt16_ShouldThrowArgumentException_GivenNonWriteableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write((short)420, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write((short)420, Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write((short)420, Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write((short)420, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteInt16_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write((short)420, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write((short)420, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write((short)420, Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write((short)420, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteInt16_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
         // we don't need to enclose this stream in a using declaration, since disposing a
@@ -30,39 +30,39 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write((short)420, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write((short)420, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write((short)420, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write((short)420, (Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteInt16_ShouldWriteBigEndian_GivenBigEndian()
     {
         using var stream = new MemoryStream();
         stream.Write((short)420, Endianness.BigEndian);
-        Assert.AreEqual(2, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(2));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[2];
         ReadOnlySpan<byte> expected = stackalloc byte[] {0x01, 0xA4};
         int read = stream.Read(actual);
 
-        Assert.AreEqual(2, read);
+        Assert.That(read, Is.EqualTo(2));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void WriteInt16_ShouldWriteLittleEndian_GivenLittleEndian()
     {
         using var stream = new MemoryStream();
         stream.Write((short)420, Endianness.LittleEndian);
-        Assert.AreEqual(2, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(2));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[2];
         ReadOnlySpan<byte> expected = stackalloc byte[] {0xA4, 0x01};
         int read = stream.Read(actual);
 
-        Assert.AreEqual(2, read);
+        Assert.That(read, Is.EqualTo(2));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.WriteInt32.cs

@@ -1,27 +1,27 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     public void WriteInt32_ShouldThrowArgumentException_GivenNonWriteableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420, Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write(420, Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write(420, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteInt32_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write(420, Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write(420, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteInt32_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
         // we don't need to enclose this stream in a using declaration, since disposing a
@@ -30,39 +30,39 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write(420, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write(420, (Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteInt32_ShouldWriteBigEndian_GivenBigEndian()
     {
         using var stream = new MemoryStream();
         stream.Write(420, Endianness.BigEndian);
-        Assert.AreEqual(4, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(4));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[4];
         ReadOnlySpan<byte> expected = stackalloc byte[] {0x00, 0x00, 0x01, 0xA4};
         int read = stream.Read(actual);
 
-        Assert.AreEqual(4, read);
+        Assert.That(read, Is.EqualTo(4));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void WriteInt32_ShouldWriteLittleEndian_GivenLittleEndian()
     {
         using var stream = new MemoryStream();
         stream.Write(420, Endianness.LittleEndian);
-        Assert.AreEqual(4, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(4));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[4];
         ReadOnlySpan<byte> expected = stackalloc byte[] {0xA4, 0x01, 0x00, 0x00};
         int read = stream.Read(actual);
 
-        Assert.AreEqual(4, read);
+        Assert.That(read, Is.EqualTo(4));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.WriteInt64.cs

@@ -1,27 +1,27 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     public void WriteInt64_ShouldThrowArgumentException_GivenNonWriteableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420L, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420L, Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write(420L, Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write(420L, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteInt64_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420L, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420L, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write(420L, Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write(420L, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteInt64_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
         // we don't need to enclose this stream in a using declaration, since disposing a
@@ -30,39 +30,39 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420L, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420L, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write(420L, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write(420L, (Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteInt64_ShouldWriteBigEndian_GivenBigEndian()
     {
         using var stream = new MemoryStream();
         stream.Write(420L, Endianness.BigEndian);
-        Assert.AreEqual(8, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(8));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[8];
         ReadOnlySpan<byte> expected = stackalloc byte[] {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xA4};
         int read = stream.Read(actual);
 
-        Assert.AreEqual(8, read);
+        Assert.That(read, Is.EqualTo(8));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void WriteInt64_ShouldWriteLittleEndian_GivenLittleEndian()
     {
         using var stream = new MemoryStream();
         stream.Write(420L, Endianness.LittleEndian);
-        Assert.AreEqual(8, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(8));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[8];
         ReadOnlySpan<byte> expected = stackalloc byte[] {0xA4, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
         int read = stream.Read(actual);
 
-        Assert.AreEqual(8, read);
+        Assert.That(read, Is.EqualTo(8));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.WriteSingle.cs

@@ -1,27 +1,27 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     public void WriteSingle_ShouldThrowArgumentException_GivenNonWriteableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420.0f, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420.0f, Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write(420.0f, Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write(420.0f, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteSingle_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420.0f, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420.0f, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write(420.0f, Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write(420.0f, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteSingle_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
         // we don't need to enclose this stream in a using declaration, since disposing a
@@ -30,39 +30,39 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420.0f, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420.0f, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write(420.0f, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write(420.0f, (Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     public void WriteSingle_ShouldWriteBigEndian_GivenBigEndian()
     {
         using var stream = new MemoryStream();
         stream.Write(420.0f, Endianness.BigEndian);
-        Assert.AreEqual(4, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(4));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[4];
         ReadOnlySpan<byte> expected = stackalloc byte[] {0x43, 0xD2, 0x00, 0x00};
         int read = stream.Read(actual);
 
-        Assert.AreEqual(4, read);
+        Assert.That(read, Is.EqualTo(4));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void WriteSingle_ShouldWriteLittleEndian_GivenLittleEndian()
     {
         using var stream = new MemoryStream();
         stream.Write(420.0f, Endianness.LittleEndian);
-        Assert.AreEqual(4, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(4));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[4];
         ReadOnlySpan<byte> expected = stackalloc byte[] {0x00, 0x00, 0xD2, 0x43};
         int read = stream.Read(actual);
 
-        Assert.AreEqual(4, read);
+        Assert.That(read, Is.EqualTo(4));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.WriteUInt16.cs

@@ -1,29 +1,29 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void WriteUInt16_ShouldThrowArgumentException_GivenNonWriteableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write((ushort)420, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write((ushort)420, Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write((ushort)420, Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write((ushort)420, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void WriteUInt16_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write((ushort)420, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write((ushort)420, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write((ushort)420, Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write((ushort)420, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void WriteUInt16_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
@@ -33,41 +33,41 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write((ushort)420, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write((ushort)420, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write((ushort)420, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write((ushort)420, (Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void WriteUInt16_ShouldWriteBigEndian_GivenBigEndian()
     {
         using var stream = new MemoryStream();
         stream.Write((ushort)420, Endianness.BigEndian);
-        Assert.AreEqual(2, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(2));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[2];
         ReadOnlySpan<byte> expected = stackalloc byte[] {0x01, 0xA4};
         int read = stream.Read(actual);
 
-        Assert.AreEqual(2, read);
+        Assert.That(read, Is.EqualTo(2));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void WriteUInt16_ShouldWriteLittleEndian_GivenLittleEndian()
     {
         using var stream = new MemoryStream();
         stream.Write((ushort)420, Endianness.LittleEndian);
-        Assert.AreEqual(2, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(2));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[2];
         ReadOnlySpan<byte> expected = stackalloc byte[] {0xA4, 0x01};
         int read = stream.Read(actual);
 
-        Assert.AreEqual(2, read);
+        Assert.That(read, Is.EqualTo(2));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.WriteUInt32.cs

@@ -1,29 +1,29 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void WriteUInt32_ShouldThrowArgumentException_GivenNonWriteableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420U, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420U, Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write(420U, Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write(420U, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void WriteUInt32_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420U, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420U, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write(420U, Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write(420U, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void WriteUInt32_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
@@ -33,41 +33,41 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420U, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420U, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write(420U, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write(420U, (Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void WriteUInt32_ShouldWriteBigEndian_GivenBigEndian()
     {
         using var stream = new MemoryStream();
         stream.Write(420U, Endianness.BigEndian);
-        Assert.AreEqual(4, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(4));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[4];
         ReadOnlySpan<byte> expected = stackalloc byte[] {0x00, 0x00, 0x01, 0xA4};
         int read = stream.Read(actual);
 
-        Assert.AreEqual(4, read);
+        Assert.That(read, Is.EqualTo(4));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void WriteUInt32_ShouldWriteLittleEndian_GivenLittleEndian()
     {
         using var stream = new MemoryStream();
         stream.Write(420U, Endianness.LittleEndian);
-        Assert.AreEqual(4, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(4));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[4];
         ReadOnlySpan<byte> expected = stackalloc byte[] {0xA4, 0x01, 0x00, 0x00};
         int read = stream.Read(actual);
 
-        Assert.AreEqual(4, read);
+        Assert.That(read, Is.EqualTo(4));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.WriteUInt64.cs

@@ -1,29 +1,29 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void WriteUInt64_ShouldThrowArgumentException_GivenNonWriteableStream()
     {
         Stream stream = new DummyStream();
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420UL, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentException>(() => stream.Write(420UL, Endianness.BigEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write(420UL, Endianness.LittleEndian));
+        Assert.Throws<ArgumentException>(() => stream.Write(420UL, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void WriteUInt64_ShouldThrowArgumentNullException_GivenNullStream()
     {
         Stream stream = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420UL, Endianness.LittleEndian));
-        Assert.ThrowsException<ArgumentNullException>(() => stream.Write(420UL, Endianness.BigEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write(420UL, Endianness.LittleEndian));
+        Assert.Throws<ArgumentNullException>(() => stream.Write(420UL, Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void WriteUInt64_ShouldThrowArgumentOutOfRangeException_GivenInvalidEndiannessValue()
     {
@@ -33,41 +33,41 @@ public partial class StreamTests
         // analyser to trip up and think the stream is disposed by the time the local is captured in
         // assertion lambda - means this line is fine as it is. please do not change.
         Stream stream = Stream.Null;
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420UL, (Endianness)(-1)));
-        Assert.ThrowsException<ArgumentOutOfRangeException>(() => stream.Write(420UL, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write(420UL, (Endianness)(-1)));
+        Assert.Throws<ArgumentOutOfRangeException>(() => stream.Write(420UL, (Endianness)(-1)));
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void WriteUInt64_ShouldWriteBigEndian_GivenBigEndian()
     {
         using var stream = new MemoryStream();
         stream.Write(420UL, Endianness.BigEndian);
-        Assert.AreEqual(8, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(8));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[8];
         ReadOnlySpan<byte> expected = stackalloc byte[] {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xA4};
         int read = stream.Read(actual);
 
-        Assert.AreEqual(8, read);
+        Assert.That(read, Is.EqualTo(8));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     [CLSCompliant(false)]
     public void WriteUInt64_ShouldWriteLittleEndian_GivenLittleEndian()
     {
         using var stream = new MemoryStream();
         stream.Write(420UL, Endianness.LittleEndian);
-        Assert.AreEqual(8, stream.Position);
+        Assert.That(stream.Position, Is.EqualTo(8));
         stream.Position = 0;
 
         Span<byte> actual = stackalloc byte[8];
         ReadOnlySpan<byte> expected = stackalloc byte[] {0xA4, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
         int read = stream.Read(actual);
 
-        Assert.AreEqual(8, read);
+        Assert.That(read, Is.EqualTo(8));
         CollectionAssert.AreEqual(expected.ToArray(), actual.ToArray());
     }
 }

X10D.Tests/src/IO/StreamTests.cs

@@ -1,15 +1,15 @@
 using System.Diagnostics;
 using System.Security.Cryptography;
 using System.Text;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
+[TestFixture]
 public partial class StreamTests
 {
-    [TestMethod]
+    [Test]
     public void GetHashSha1ShouldBeCorrect()
     {
         // SHA-1
@@ -29,15 +29,15 @@ public partial class StreamTests
         CollectionAssert.AreEqual(expectedHash, hash);
     }
 
-    [TestMethod]
+    [Test]
     public void GetHashNullShouldThrow()
     {
         // any HashAlgorithm will do, but SHA1 is used above. so to remain consistent, we use it here
-        Assert.ThrowsException<ArgumentNullException>(() => ((Stream?)null)!.GetHash<SHA1>());
-        Assert.ThrowsException<ArgumentNullException>(() => ((Stream?)null)!.TryWriteHash<SHA1>(Span<byte>.Empty, out _));
+        Assert.Throws<ArgumentNullException>(() => ((Stream?)null)!.GetHash<SHA1>());
+        Assert.Throws<ArgumentNullException>(() => ((Stream?)null)!.TryWriteHash<SHA1>(Span<byte>.Empty, out _));
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteHashSha1_ShouldBeCorrect()
     {
         // SHA-1
@@ -53,49 +53,49 @@ public partial class StreamTests
 
         Span<byte> hash = stackalloc byte[20];
         stream.TryWriteHash<SHA1>(hash, out int bytesWritten);
-        Assert.AreEqual(expectedHash.Length, bytesWritten);
+        Assert.That(bytesWritten, Is.EqualTo(expectedHash.Length));
         CollectionAssert.AreEqual(expectedHash, hash.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void GetHash_TryWriteHash_ShouldThrow_GivenNonReadableStream()
     {
-        Assert.ThrowsException<IOException>(() =>
+        Assert.Throws<IOException>(() =>
         {
             using var stream = new DummyStream();
             stream.GetHash<SHA1>();
         });
 
-        Assert.ThrowsException<IOException>(() =>
+        Assert.Throws<IOException>(() =>
         {
             using var stream = new DummyStream();
             stream.TryWriteHash<SHA1>(Span<byte>.Empty, out _);
         });
     }
 
-    [TestMethod]
+    [Test]
     public void LargeStreamShouldThrow()
     {
-        Assert.ThrowsException<ArgumentException>(() =>
+        Assert.Throws<ArgumentException>(() =>
         {
             using var stream = new DummyStream(true);
             stream.TryWriteHash<SHA1>(Span<byte>.Empty, out _);
         });
     }
 
-    [TestMethod]
+    [Test]
     public void NullCreateMethodShouldThrow()
     {
-        Assert.ThrowsException<TypeInitializationException>(() => Stream.Null.GetHash<HashAlgorithmTestClass>());
-        Assert.ThrowsException<TypeInitializationException>(() =>
+        Assert.Throws<TypeInitializationException>(() => Stream.Null.GetHash<HashAlgorithmTestClass>());
+        Assert.Throws<TypeInitializationException>(() =>
             Stream.Null.TryWriteHash<HashAlgorithmTestClass>(Span<byte>.Empty, out _));
     }
 
-    [TestMethod]
+    [Test]
     public void NoCreateMethodShouldThrow()
     {
-        Assert.ThrowsException<TypeInitializationException>(() => Stream.Null.GetHash<HashAlgorithmTestClassNoCreateMethod>());
-        Assert.ThrowsException<TypeInitializationException>(() =>
+        Assert.Throws<TypeInitializationException>(() => Stream.Null.GetHash<HashAlgorithmTestClassNoCreateMethod>());
+        Assert.Throws<TypeInitializationException>(() =>
             Stream.Null.TryWriteHash<HashAlgorithmTestClassNoCreateMethod>(Span<byte>.Empty, out _));
     }
 

X10D.Tests/src/IO/TextReaderTests.cs

@@ -1,13 +1,13 @@
 using System.Text;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
+[TestFixture]
 public class TextReaderTests
 {
-    [TestMethod]
+    [Test]
     public void EnumerateLines_ShouldYield10Lines_Given10LineString()
     {
         using var stream = new MemoryStream();
@@ -28,10 +28,10 @@ public class TextReaderTests
             lineCount++;
         }
 
-        Assert.AreEqual(10, lineCount);
+        Assert.That(lineCount, Is.EqualTo(10));
     }
 
-    [TestMethod]
+    [Test]
     public async Task EnumerateLinesAsync_ShouldYield10Lines_Given10LineString()
     {
         using var stream = new MemoryStream();
@@ -52,14 +52,14 @@ public class TextReaderTests
             lineCount++;
         }
 
-        Assert.AreEqual(10, lineCount);
+        Assert.That(lineCount, Is.EqualTo(10));
     }
 
-    [TestMethod]
+    [Test]
     public void EnumerateLines_ShouldThrowArgumentNullException_GivenNullSource()
     {
         TextReader reader = null!;
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() =>
         {
             foreach (string _ in reader.EnumerateLines())
             {
@@ -68,16 +68,16 @@ public class TextReaderTests
         });
     }
 
-    [TestMethod]
-    public async Task EnumerateLinesAsync_ShouldThrowArgumentNullException_GivenNullSource()
+    [Test]
+    public void EnumerateLinesAsync_ShouldThrowArgumentNullException_GivenNullSource()
     {
         TextReader reader = null!;
-        await Assert.ThrowsExceptionAsync<ArgumentNullException>(async () =>
+        Assert.ThrowsAsync<ArgumentNullException>(async () =>
         {
             await foreach (string _ in reader.EnumerateLinesAsync().ConfigureAwait(false))
             {
                 // loop body is intentionally empty
             }
-        }).ConfigureAwait(false);
+        });
     }
 }

X10D.Tests/src/IO/UInt16Tests.cs

@@ -1,13 +1,13 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
+[TestFixture]
 [CLSCompliant(false)]
 public class UInt16Tests
 {
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsCorrectValue()
     {
         const ushort value = 0x0F;
@@ -15,7 +15,7 @@ public class UInt16Tests
         CollectionAssert.AreEqual(bytes, value.GetBytes());
     }
 
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsCorrectValue_WithEndianness()
     {
         const ushort value = 0x0F;
@@ -26,18 +26,18 @@ public class UInt16Tests
         CollectionAssert.AreEqual(bigEndian, value.GetBytes(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan()
     {
         const ushort value = 0x0F;
         byte[] bytes = BitConverter.IsLittleEndian ? new byte[] {0x0F, 0} : new byte[] {0, 0x0F};
 
         Span<byte> buffer = stackalloc byte[2];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer));
         CollectionAssert.AreEqual(bytes, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan_WithEndianness()
     {
         const ushort value = 0x0F;
@@ -46,18 +46,18 @@ public class UInt16Tests
 
         Span<byte> buffer = stackalloc byte[2];
 
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.LittleEndian));
+        Assert.That(value.TryWriteBytes(buffer, Endianness.LittleEndian));
         CollectionAssert.AreEqual(littleEndian, buffer.ToArray());
 
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.BigEndian));
+        Assert.That(value.TryWriteBytes(buffer, Endianness.BigEndian));
         CollectionAssert.AreEqual(bigEndian, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
     {
         const ushort value = 0x0F;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/UInt32Tests.cs

@@ -1,13 +1,13 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
+[TestFixture]
 [CLSCompliant(false)]
 public class UInt32Tests
 {
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsCorrectValue()
     {
         const uint value = 0x0F;
@@ -15,7 +15,7 @@ public class UInt32Tests
         CollectionAssert.AreEqual(bytes, value.GetBytes());
     }
 
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsCorrectValue_WithEndianness()
     {
         const uint value = 0x0F;
@@ -26,18 +26,18 @@ public class UInt32Tests
         CollectionAssert.AreEqual(bigEndian, value.GetBytes(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan()
     {
         const uint value = 0x0F;
         byte[] bytes = BitConverter.IsLittleEndian ? new byte[] {0x0F, 0, 0, 0} : new byte[] {0, 0, 0, 0x0F};
 
         Span<byte> buffer = stackalloc byte[4];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer));
         CollectionAssert.AreEqual(bytes, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan_WithEndianness()
     {
         const uint value = 0x0F;
@@ -46,18 +46,18 @@ public class UInt32Tests
 
         Span<byte> buffer = stackalloc byte[4];
 
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.LittleEndian));
+        Assert.That(value.TryWriteBytes(buffer, Endianness.LittleEndian));
         CollectionAssert.AreEqual(littleEndian, buffer.ToArray());
 
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.BigEndian));
+        Assert.That(value.TryWriteBytes(buffer, Endianness.BigEndian));
         CollectionAssert.AreEqual(bigEndian, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
     {
         const uint value = 0x0F;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer), Is.False);
     }
 }

X10D.Tests/src/IO/UInt64Tests.cs

@@ -1,13 +1,13 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.IO;
 
 namespace X10D.Tests.IO;
 
-[TestClass]
+[TestFixture]
 [CLSCompliant(false)]
 public class UInt64Tests
 {
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsCorrectValue()
     {
         const ulong value = 0x0F;
@@ -17,7 +17,7 @@ public class UInt64Tests
         CollectionAssert.AreEqual(bytes, value.GetBytes());
     }
 
-    [TestMethod]
+    [Test]
     public void GetBytes_ReturnsCorrectValue_WithEndianness()
     {
         const ulong value = 0x0F;
@@ -28,7 +28,7 @@ public class UInt64Tests
         CollectionAssert.AreEqual(bigEndian, value.GetBytes(Endianness.BigEndian));
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan()
     {
         const ulong value = 0x0F;
@@ -37,11 +37,11 @@ public class UInt64Tests
             : new byte[] {0, 0, 0, 0, 0, 0, 0, 0x0F};
 
         Span<byte> buffer = stackalloc byte[8];
-        Assert.IsTrue(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer));
         CollectionAssert.AreEqual(bytes, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsTrue_FillsSpanCorrectly_GivenLargeEnoughSpan_WithEndianness()
     {
         const ulong value = 0x0F;
@@ -50,18 +50,18 @@ public class UInt64Tests
 
         Span<byte> buffer = stackalloc byte[8];
 
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.LittleEndian));
+        Assert.That(value.TryWriteBytes(buffer, Endianness.LittleEndian));
         CollectionAssert.AreEqual(littleEndian, buffer.ToArray());
 
-        Assert.IsTrue(value.TryWriteBytes(buffer, Endianness.BigEndian));
+        Assert.That(value.TryWriteBytes(buffer, Endianness.BigEndian));
         CollectionAssert.AreEqual(bigEndian, buffer.ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void TryWriteBytes_ReturnsFalse_GivenSmallSpan()
     {
         const ulong value = 0x0F;
         Span<byte> buffer = stackalloc byte[0];
-        Assert.IsFalse(value.TryWriteBytes(buffer));
+        Assert.That(value.TryWriteBytes(buffer), Is.False);
     }
 }

X10D.Tests/src/Linq/ByteTests.cs

@@ -1,48 +1,48 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Linq;
 
 namespace X10D.Tests.Linq;
 
-[TestClass]
+[TestFixture]
 public class ByteTests
 {
-    [TestMethod]
+    [Test]
     public void ProductShouldBeCorrect()
     {
         byte Cast(int i) => (byte)i;
 
-        Assert.AreEqual(0, Enumerable.Range(0, 10).Select(Cast).Product());
-        Assert.AreEqual(1, Enumerable.Range(1, 1).Select(Cast).Product());
-        Assert.AreEqual(2, Enumerable.Range(1, 2).Select(Cast).Product());
-        Assert.AreEqual(6, Enumerable.Range(1, 3).Select(Cast).Product());
-        Assert.AreEqual(24, Enumerable.Range(1, 4).Select(Cast).Product());
-        Assert.AreEqual(120, Enumerable.Range(1, 5).Select(Cast).Product());
+        Assert.That(Enumerable.Range(0, 10).Select(Cast).Product(), Is.Zero);
+        Assert.That(Enumerable.Range(1, 1).Select(Cast).Product(), Is.EqualTo(1));
+        Assert.That(Enumerable.Range(1, 2).Select(Cast).Product(), Is.EqualTo(2));
+        Assert.That(Enumerable.Range(1, 3).Select(Cast).Product(), Is.EqualTo(6));
+        Assert.That(Enumerable.Range(1, 4).Select(Cast).Product(), Is.EqualTo(24));
+        Assert.That(Enumerable.Range(1, 5).Select(Cast).Product(), Is.EqualTo(120));
 
         // 6! will overflow for byte
     }
 
-    [TestMethod]
+    [Test]
     public void ProductOfDoublesShouldBeCorrect()
     {
         byte Double(int i) => (byte)(i * 2);
 
-        Assert.AreEqual(0, Enumerable.Range(0, 10).Product(Double));
-        Assert.AreEqual(2, Enumerable.Range(1, 1).Product(Double));
-        Assert.AreEqual(8, Enumerable.Range(1, 2).Product(Double));
-        Assert.AreEqual(48, Enumerable.Range(1, 3).Product(Double));
+        Assert.That(Enumerable.Range(0, 10).Product(Double), Is.Zero);
+        Assert.That(Enumerable.Range(1, 1).Product(Double), Is.EqualTo(2));
+        Assert.That(Enumerable.Range(1, 2).Product(Double), Is.EqualTo(8));
+        Assert.That(Enumerable.Range(1, 3).Product(Double), Is.EqualTo(48));
 
         // Π_(i=1)^n (2i) will overflow at i=4 for byte
     }
 
-    [TestMethod]
+    [Test]
     public void Product_ShouldThrowArgumentNullException_GivenNullSource()
     {
         IEnumerable<byte> source = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product());
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product(v => v));
+        Assert.Throws<ArgumentNullException>(() => source.Product());
+        Assert.Throws<ArgumentNullException>(() => source.Product(v => v));
     }
 
-    [TestMethod]
+    [Test]
     public void RangeTo_Byte_ShouldYieldCorrectValues()
     {
         const byte start = 1;
@@ -51,13 +51,13 @@ public class ByteTests
         byte current = 1;
         foreach (byte value in start.RangeTo(end))
         {
-            Assert.AreEqual(current++, value);
+            Assert.That(value, Is.EqualTo(current++));
         }
 
-        Assert.AreEqual(current, end);
+        Assert.That(end, Is.EqualTo(current));
     }
 
-    [TestMethod]
+    [Test]
     public void RangeTo_Int16_ShouldYieldCorrectValues()
     {
         const byte start = 1;
@@ -66,13 +66,13 @@ public class ByteTests
         short current = 1;
         foreach (short value in start.RangeTo(end))
         {
-            Assert.AreEqual(current++, value);
+            Assert.That(value, Is.EqualTo(current++));
         }
 
-        Assert.AreEqual(current, end);
+        Assert.That(end, Is.EqualTo(current));
     }
 
-    [TestMethod]
+    [Test]
     public void RangeTo_Int32_ShouldYieldCorrectValues()
     {
         const byte start = 1;
@@ -81,13 +81,13 @@ public class ByteTests
         int current = 1;
         foreach (int value in start.RangeTo(end))
         {
-            Assert.AreEqual(current++, value);
+            Assert.That(value, Is.EqualTo(current++));
         }
 
-        Assert.AreEqual(current, end);
+        Assert.That(end, Is.EqualTo(current));
     }
 
-    [TestMethod]
+    [Test]
     public void RangeTo_Int64_ShouldYieldCorrectValues()
     {
         const byte start = 1;
@@ -96,9 +96,9 @@ public class ByteTests
         long current = 1;
         foreach (long value in start.RangeTo(end))
         {
-            Assert.AreEqual(current++, value);
+            Assert.That(value, Is.EqualTo(current++));
         }
 
-        Assert.AreEqual(current, end);
+        Assert.That(end, Is.EqualTo(current));
     }
 }

X10D.Tests/src/Linq/DecimalTests.cs

@@ -1,52 +1,58 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Linq;
 
 namespace X10D.Tests.Linq;
 
-[TestClass]
+[TestFixture]
 public class DecimalTests
 {
-    [TestMethod]
+    [Test]
     public void ProductShouldBeCorrect()
     {
         decimal Cast(int i) => i;
 
-        Assert.AreEqual(0m, Enumerable.Range(0, 10).Select(Cast).Product());
-        Assert.AreEqual(1m, Enumerable.Range(1, 1).Select(Cast).Product());
-        Assert.AreEqual(2m, Enumerable.Range(1, 2).Select(Cast).Product());
-        Assert.AreEqual(6m, Enumerable.Range(1, 3).Select(Cast).Product());
-        Assert.AreEqual(24m, Enumerable.Range(1, 4).Select(Cast).Product());
-        Assert.AreEqual(120m, Enumerable.Range(1, 5).Select(Cast).Product());
-        Assert.AreEqual(720m, Enumerable.Range(1, 6).Select(Cast).Product());
-        Assert.AreEqual(5040m, Enumerable.Range(1, 7).Select(Cast).Product());
-        Assert.AreEqual(40320m, Enumerable.Range(1, 8).Select(Cast).Product());
-        Assert.AreEqual(362880m, Enumerable.Range(1, 9).Select(Cast).Product());
-        Assert.AreEqual(3628800m, Enumerable.Range(1, 10).Select(Cast).Product());
+        Assert.Multiple(() =>
+        {
+            Assert.That(Enumerable.Range(0, 10).Select(Cast).Product(), Is.EqualTo(0m));
+            Assert.That(Enumerable.Range(1, 1).Select(Cast).Product(), Is.EqualTo(1m));
+            Assert.That(Enumerable.Range(1, 2).Select(Cast).Product(), Is.EqualTo(2m));
+            Assert.That(Enumerable.Range(1, 3).Select(Cast).Product(), Is.EqualTo(6m));
+            Assert.That(Enumerable.Range(1, 4).Select(Cast).Product(), Is.EqualTo(24m));
+            Assert.That(Enumerable.Range(1, 5).Select(Cast).Product(), Is.EqualTo(120m));
+            Assert.That(Enumerable.Range(1, 6).Select(Cast).Product(), Is.EqualTo(720m));
+            Assert.That(Enumerable.Range(1, 7).Select(Cast).Product(), Is.EqualTo(5040m));
+            Assert.That(Enumerable.Range(1, 8).Select(Cast).Product(), Is.EqualTo(40320m));
+            Assert.That(Enumerable.Range(1, 9).Select(Cast).Product(), Is.EqualTo(362880m));
+            Assert.That(Enumerable.Range(1, 10).Select(Cast).Product(), Is.EqualTo(3628800m));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ProductOfDoublesShouldBeCorrect()
     {
         decimal Double(int i) => i * 2m;
 
-        Assert.AreEqual(0m, Enumerable.Range(0, 10).Product(Double));
-        Assert.AreEqual(2m, Enumerable.Range(1, 1).Product(Double));
-        Assert.AreEqual(8m, Enumerable.Range(1, 2).Product(Double));
-        Assert.AreEqual(48m, Enumerable.Range(1, 3).Product(Double));
-        Assert.AreEqual(384m, Enumerable.Range(1, 4).Product(Double));
-        Assert.AreEqual(3840m, Enumerable.Range(1, 5).Product(Double));
-        Assert.AreEqual(46080m, Enumerable.Range(1, 6).Product(Double));
-        Assert.AreEqual(645120m, Enumerable.Range(1, 7).Product(Double));
-        Assert.AreEqual(10321920m, Enumerable.Range(1, 8).Product(Double));
-        Assert.AreEqual(185794560m, Enumerable.Range(1, 9).Product(Double));
-        Assert.AreEqual(3715891200m, Enumerable.Range(1, 10).Product(Double));
+        Assert.Multiple(() =>
+        {
+            Assert.That(Enumerable.Range(0, 10).Product(Double), Is.EqualTo(0m));
+            Assert.That(Enumerable.Range(1, 1).Product(Double), Is.EqualTo(2m));
+            Assert.That(Enumerable.Range(1, 2).Product(Double), Is.EqualTo(8m));
+            Assert.That(Enumerable.Range(1, 3).Product(Double), Is.EqualTo(48m));
+            Assert.That(Enumerable.Range(1, 4).Product(Double), Is.EqualTo(384m));
+            Assert.That(Enumerable.Range(1, 5).Product(Double), Is.EqualTo(3840m));
+            Assert.That(Enumerable.Range(1, 6).Product(Double), Is.EqualTo(46080m));
+            Assert.That(Enumerable.Range(1, 7).Product(Double), Is.EqualTo(645120m));
+            Assert.That(Enumerable.Range(1, 8).Product(Double), Is.EqualTo(10321920m));
+            Assert.That(Enumerable.Range(1, 9).Product(Double), Is.EqualTo(185794560m));
+            Assert.That(Enumerable.Range(1, 10).Product(Double), Is.EqualTo(3715891200m));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Product_ShouldThrowArgumentNullException_GivenNullSource()
     {
         IEnumerable<decimal> source = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product());
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product(v => v));
+        Assert.Throws<ArgumentNullException>(() => source.Product());
+        Assert.Throws<ArgumentNullException>(() => source.Product(v => v));
     }
 }

X10D.Tests/src/Linq/DoubleTests.cs

@@ -1,52 +1,58 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Linq;
 
 namespace X10D.Tests.Linq;
 
-[TestClass]
+[TestFixture]
 public class DoubleTests
 {
-    [TestMethod]
+    [Test]
     public void ProductShouldBeCorrect()
     {
         double Cast(int i) => i;
 
-        Assert.AreEqual(0.0, Enumerable.Range(0, 10).Select(Cast).Product());
-        Assert.AreEqual(1.0, Enumerable.Range(1, 1).Select(Cast).Product());
-        Assert.AreEqual(2.0, Enumerable.Range(1, 2).Select(Cast).Product());
-        Assert.AreEqual(6.0, Enumerable.Range(1, 3).Select(Cast).Product());
-        Assert.AreEqual(24.0, Enumerable.Range(1, 4).Select(Cast).Product());
-        Assert.AreEqual(120.0, Enumerable.Range(1, 5).Select(Cast).Product());
-        Assert.AreEqual(720.0, Enumerable.Range(1, 6).Select(Cast).Product());
-        Assert.AreEqual(5040.0, Enumerable.Range(1, 7).Select(Cast).Product());
-        Assert.AreEqual(40320.0, Enumerable.Range(1, 8).Select(Cast).Product());
-        Assert.AreEqual(362880.0, Enumerable.Range(1, 9).Select(Cast).Product());
-        Assert.AreEqual(3628800.0, Enumerable.Range(1, 10).Select(Cast).Product());
+        Assert.Multiple(() =>
+        {
+            Assert.That(Enumerable.Range(0, 10).Select(Cast).Product(), Is.EqualTo(0.0));
+            Assert.That(Enumerable.Range(1, 1).Select(Cast).Product(), Is.EqualTo(1.0));
+            Assert.That(Enumerable.Range(1, 2).Select(Cast).Product(), Is.EqualTo(2.0));
+            Assert.That(Enumerable.Range(1, 3).Select(Cast).Product(), Is.EqualTo(6.0));
+            Assert.That(Enumerable.Range(1, 4).Select(Cast).Product(), Is.EqualTo(24.0));
+            Assert.That(Enumerable.Range(1, 5).Select(Cast).Product(), Is.EqualTo(120.0));
+            Assert.That(Enumerable.Range(1, 6).Select(Cast).Product(), Is.EqualTo(720.0));
+            Assert.That(Enumerable.Range(1, 7).Select(Cast).Product(), Is.EqualTo(5040.0));
+            Assert.That(Enumerable.Range(1, 8).Select(Cast).Product(), Is.EqualTo(40320.0));
+            Assert.That(Enumerable.Range(1, 9).Select(Cast).Product(), Is.EqualTo(362880.0));
+            Assert.That(Enumerable.Range(1, 10).Select(Cast).Product(), Is.EqualTo(3628800.0));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ProductOfDoublesShouldBeCorrect()
     {
         double Double(int i) => i * 2.0;
 
-        Assert.AreEqual(0.0, Enumerable.Range(0, 10).Product(Double));
-        Assert.AreEqual(2.0, Enumerable.Range(1, 1).Product(Double));
-        Assert.AreEqual(8.0, Enumerable.Range(1, 2).Product(Double));
-        Assert.AreEqual(48.0, Enumerable.Range(1, 3).Product(Double));
-        Assert.AreEqual(384.0, Enumerable.Range(1, 4).Product(Double));
-        Assert.AreEqual(3840.0, Enumerable.Range(1, 5).Product(Double));
-        Assert.AreEqual(46080.0, Enumerable.Range(1, 6).Product(Double));
-        Assert.AreEqual(645120.0, Enumerable.Range(1, 7).Product(Double));
-        Assert.AreEqual(10321920.0, Enumerable.Range(1, 8).Product(Double));
-        Assert.AreEqual(185794560.0, Enumerable.Range(1, 9).Product(Double));
-        Assert.AreEqual(3715891200.0, Enumerable.Range(1, 10).Product(Double));
+        Assert.Multiple(() =>
+        {
+            Assert.That(Enumerable.Range(0, 10).Product(Double), Is.EqualTo(0.0));
+            Assert.That(Enumerable.Range(1, 1).Product(Double), Is.EqualTo(2.0));
+            Assert.That(Enumerable.Range(1, 2).Product(Double), Is.EqualTo(8.0));
+            Assert.That(Enumerable.Range(1, 3).Product(Double), Is.EqualTo(48.0));
+            Assert.That(Enumerable.Range(1, 4).Product(Double), Is.EqualTo(384.0));
+            Assert.That(Enumerable.Range(1, 5).Product(Double), Is.EqualTo(3840.0));
+            Assert.That(Enumerable.Range(1, 6).Product(Double), Is.EqualTo(46080.0));
+            Assert.That(Enumerable.Range(1, 7).Product(Double), Is.EqualTo(645120.0));
+            Assert.That(Enumerable.Range(1, 8).Product(Double), Is.EqualTo(10321920.0));
+            Assert.That(Enumerable.Range(1, 9).Product(Double), Is.EqualTo(185794560.0));
+            Assert.That(Enumerable.Range(1, 10).Product(Double), Is.EqualTo(3715891200.0));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Product_ShouldThrowArgumentNullException_GivenNullSource()
     {
         IEnumerable<double> source = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product());
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product(v => v));
+        Assert.Throws<ArgumentNullException>(() => source.Product());
+        Assert.Throws<ArgumentNullException>(() => source.Product(v => v));
     }
 }

X10D.Tests/src/Linq/EnumerableTests.cs

@@ -1,12 +1,12 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Linq;
 
 namespace X10D.Tests.Linq;
 
-[TestClass]
+[TestFixture]
 public class EnumerableTests
 {
-    [TestMethod]
+    [Test]
     public void ConcatOne_ShouldReturnConcatenatedSequence_GivenValidSequenceAndValue()
     {
         IEnumerable<string> source = new[] {"Hello"};
@@ -14,11 +14,11 @@ public class EnumerableTests
 
         string[] actual = source.ConcatOne("World").ToArray();
 
-        Assert.AreEqual(2, actual.Length);
+        Assert.That(actual, Has.Length.EqualTo(2));
         CollectionAssert.AreEqual(expected, actual);
     }
 
-    [TestMethod]
+    [Test]
     public void ConcatOne_ShouldReturnSingletonSequence_GivenEmptySequenceAndValidValue()
     {
         IEnumerable<string> source = Enumerable.Empty<string>();
@@ -26,159 +26,195 @@ public class EnumerableTests
 
         string[] actual = source.ConcatOne("Foobar").ToArray();
 
-        Assert.AreEqual(1, actual.Length);
+        Assert.That(actual, Has.Length.EqualTo(1));
         CollectionAssert.AreEqual(expected, actual);
     }
 
-    [TestMethod]
+    [Test]
     public void ConcatOne_ShouldThrowArgumentNullException_GivenNullSource()
     {
         IEnumerable<string>? source = null;
-        Assert.ThrowsException<ArgumentNullException>(() => source!.ConcatOne("Foobar").ToArray());
+        Assert.Throws<ArgumentNullException>(() => source!.ConcatOne("Foobar").ToArray());
     }
 
-    [TestMethod]
+    [Test]
     public void MinMax_ShouldReturnCorrectValues_UsingDefaultComparer()
     {
         IEnumerable<int> source = Enumerable.Range(1, 10);
         (int minimum, int maximum) = source.MinMax();
-        Assert.AreEqual(1, minimum);
-        Assert.AreEqual(10, maximum);
+        Assert.Multiple(() =>
+        {
+            Assert.That(minimum, Is.EqualTo(1));
+            Assert.That(maximum, Is.EqualTo(10));
+        });
 
         source = Enumerable.Range(1, 10).ToArray();
         (minimum, maximum) = source.MinMax();
-        Assert.AreEqual(1, minimum);
-        Assert.AreEqual(10, maximum);
+        Assert.Multiple(() =>
+        {
+            Assert.That(minimum, Is.EqualTo(1));
+            Assert.That(maximum, Is.EqualTo(10));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void MinMax_ShouldReturnCorrectSelectedValues_UsingDefaultComparer()
     {
         IEnumerable<Person> source = Enumerable.Range(1, 10).Select(i => new Person {Age = i});
         (int minimum, int maximum) = source.MinMax(p => p.Age);
-        Assert.AreEqual(1, minimum);
-        Assert.AreEqual(10, maximum);
+        Assert.Multiple(() =>
+        {
+            Assert.That(minimum, Is.EqualTo(1));
+            Assert.That(maximum, Is.EqualTo(10));
+        });
 
         source = Enumerable.Range(1, 10).Select(i => new Person {Age = i}).ToArray();
         (minimum, maximum) = source.MinMax(p => p.Age);
-        Assert.AreEqual(1, minimum);
-        Assert.AreEqual(10, maximum);
+        Assert.Multiple(() =>
+        {
+            Assert.That(minimum, Is.EqualTo(1));
+            Assert.That(maximum, Is.EqualTo(10));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void MinMax_ShouldReturnOppositeSelectedValues_UsingInverseComparer()
     {
         IEnumerable<Person> source = Enumerable.Range(1, 10).Select(i => new Person {Age = i});
         (int minimum, int maximum) = source.MinMax(p => p.Age, new InverseComparer<int>());
-        Assert.AreEqual(10, minimum);
-        Assert.AreEqual(1, maximum);
+        Assert.Multiple(() =>
+        {
+            Assert.That(minimum, Is.EqualTo(10));
+            Assert.That(maximum, Is.EqualTo(1));
+        });
 
         source = Enumerable.Range(1, 10).Select(i => new Person {Age = i}).ToArray();
         (minimum, maximum) = source.MinMax(p => p.Age, new InverseComparer<int>());
-        Assert.AreEqual(10, minimum);
-        Assert.AreEqual(1, maximum);
+        Assert.Multiple(() =>
+        {
+            Assert.That(minimum, Is.EqualTo(10));
+            Assert.That(maximum, Is.EqualTo(1));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void MinMax_ShouldReturnOppositeValues_UsingInverseComparer()
     {
         (int minimum, int maximum) = Enumerable.Range(1, 10).MinMax(new InverseComparer<int>());
-        Assert.AreEqual(10, minimum);
-        Assert.AreEqual(1, maximum);
+        Assert.Multiple(() =>
+        {
+            Assert.That(minimum, Is.EqualTo(10));
+            Assert.That(maximum, Is.EqualTo(1));
+        });
 
         (minimum, maximum) = Enumerable.Range(1, 10).ToArray().MinMax(new InverseComparer<int>());
-        Assert.AreEqual(10, minimum);
-        Assert.AreEqual(1, maximum);
+        Assert.Multiple(() =>
+        {
+            Assert.That(minimum, Is.EqualTo(10));
+            Assert.That(maximum, Is.EqualTo(1));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void MinMax_ShouldThrowArgumentNullException_GivenNullSelector()
     {
         IEnumerable<int> source = Enumerable.Empty<int>();
-        Assert.ThrowsException<ArgumentNullException>(() => source.MinMax((Func<int, int>)(null!)));
-        Assert.ThrowsException<ArgumentNullException>(() => source.MinMax((Func<int, int>)(null!), null));
+        Assert.Throws<ArgumentNullException>(() => source.MinMax((Func<int, int>)(null!)));
+        Assert.Throws<ArgumentNullException>(() => source.MinMax((Func<int, int>)(null!), null));
     }
 
-    [TestMethod]
+    [Test]
     public void MinMax_ShouldThrowArgumentNullException_GivenNullSource()
     {
         IEnumerable<int>? source = null;
-        Assert.ThrowsException<ArgumentNullException>(() => source!.MinMax());
-        Assert.ThrowsException<ArgumentNullException>(() => source!.MinMax(v => v));
-        Assert.ThrowsException<ArgumentNullException>(() => source!.MinMax(null));
-        Assert.ThrowsException<ArgumentNullException>(() => source!.MinMax(v => v, null));
+        Assert.Throws<ArgumentNullException>(() => source!.MinMax());
+        Assert.Throws<ArgumentNullException>(() => source!.MinMax(v => v));
+        Assert.Throws<ArgumentNullException>(() => source!.MinMax(null));
+        Assert.Throws<ArgumentNullException>(() => source!.MinMax(v => v, null));
     }
 
-    [TestMethod]
+    [Test]
     public void MinMax_ShouldThrowInvalidOperationException_GivenEmptySource()
     {
-        Assert.ThrowsException<InvalidOperationException>(() => Enumerable.Empty<int>().MinMax());
-        Assert.ThrowsException<InvalidOperationException>(() => Array.Empty<int>().MinMax());
-        Assert.ThrowsException<InvalidOperationException>(() => new List<int>().MinMax());
+        Assert.Throws<InvalidOperationException>(() => Enumerable.Empty<int>().MinMax());
+        Assert.Throws<InvalidOperationException>(() => Array.Empty<int>().MinMax());
+        Assert.Throws<InvalidOperationException>(() => new List<int>().MinMax());
 
-        Assert.ThrowsException<InvalidOperationException>(() => Enumerable.Empty<int>().MinMax(i => i * 2));
-        Assert.ThrowsException<InvalidOperationException>(() => Array.Empty<int>().MinMax(i => i * 2));
-        Assert.ThrowsException<InvalidOperationException>(() => new List<int>().MinMax(i => i * 2));
+        Assert.Throws<InvalidOperationException>(() => Enumerable.Empty<int>().MinMax(i => i * 2));
+        Assert.Throws<InvalidOperationException>(() => Array.Empty<int>().MinMax(i => i * 2));
+        Assert.Throws<InvalidOperationException>(() => new List<int>().MinMax(i => i * 2));
     }
 
-    [TestMethod]
+    [Test]
     public void MinMaxBy_ShouldReturnCorrectSelectedValues_UsingDefaultComparer()
     {
         IEnumerable<Person> source = Enumerable.Range(1, 10).Select(i => new Person {Age = i});
         (Person minimum, Person maximum) = source.MinMaxBy(p => p.Age);
-        Assert.AreEqual(1, minimum.Age);
-        Assert.AreEqual(10, maximum.Age);
+        Assert.Multiple(() =>
+        {
+            Assert.That(minimum.Age, Is.EqualTo(1));
+            Assert.That(maximum.Age, Is.EqualTo(10));
+        });
 
         source = Enumerable.Range(1, 10).Select(i => new Person {Age = i}).ToArray();
         (minimum, maximum) = source.MinMaxBy(p => p.Age);
-        Assert.AreEqual(1, minimum.Age);
-        Assert.AreEqual(10, maximum.Age);
+        Assert.Multiple(() =>
+        {
+            Assert.That(minimum.Age, Is.EqualTo(1));
+            Assert.That(maximum.Age, Is.EqualTo(10));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void MinMaxBy_ShouldReturnOppositeSelectedValues_UsingInverseComparer()
     {
         IEnumerable<Person> source = Enumerable.Range(1, 10).Select(i => new Person {Age = i});
         (Person minimum, Person maximum) = source.MinMaxBy(p => p.Age, new InverseComparer<int>());
-        Assert.AreEqual(10, minimum.Age);
-        Assert.AreEqual(1, maximum.Age);
+        Assert.Multiple(() =>
+        {
+            Assert.That(minimum.Age, Is.EqualTo(10));
+            Assert.That(maximum.Age, Is.EqualTo(1));
+        });
 
         source = Enumerable.Range(1, 10).Select(i => new Person {Age = i}).ToArray();
         (minimum, maximum) = source.MinMaxBy(p => p.Age, new InverseComparer<int>());
-        Assert.AreEqual(10, minimum.Age);
-        Assert.AreEqual(1, maximum.Age);
+        Assert.Multiple(() =>
+        {
+            Assert.That(minimum.Age, Is.EqualTo(10));
+            Assert.That(maximum.Age, Is.EqualTo(1));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void MinMaxBy_ShouldThrowArgumentNullException_GivenNullSelector()
     {
         Person[] source = Enumerable.Range(1, 10).Select(i => new Person {Age = i}).ToArray();
 
-        Assert.ThrowsException<ArgumentNullException>(() => source.MinMaxBy((Func<Person, int>)null!));
-        Assert.ThrowsException<ArgumentNullException>(() => source.MinMaxBy((Func<Person, int>)null!, null));
+        Assert.Throws<ArgumentNullException>(() => source.MinMaxBy((Func<Person, int>)null!));
+        Assert.Throws<ArgumentNullException>(() => source.MinMaxBy((Func<Person, int>)null!, null));
     }
 
-    [TestMethod]
+    [Test]
     public void MinMaxBy_ShouldThrowArgumentNullException_GivenNullSource()
     {
         IEnumerable<Person>? source = null;
-        Assert.ThrowsException<ArgumentNullException>(() => source!.MinMaxBy(p => p.Age));
-        Assert.ThrowsException<ArgumentNullException>(() => source!.MinMaxBy(p => p.Age, null));
+        Assert.Throws<ArgumentNullException>(() => source!.MinMaxBy(p => p.Age));
+        Assert.Throws<ArgumentNullException>(() => source!.MinMaxBy(p => p.Age, null));
     }
 
-    [TestMethod]
+    [Test]
     public void MinMaxBy_ShouldThrowInvalidOperationException_GivenEmptySource()
     {
-        Assert.ThrowsException<InvalidOperationException>(() =>
+        Assert.Throws<InvalidOperationException>(() =>
         {
             IEnumerable<Person> source = Enumerable.Empty<Person>();
-            return source.MinMaxBy(p => p.Age);
+            _ = source.MinMaxBy(p => p.Age);
         });
 
-        Assert.ThrowsException<InvalidOperationException>(() =>
+        Assert.Throws<InvalidOperationException>(() =>
         {
             Person[] source = Array.Empty<Person>();
-            return source.MinMaxBy(p => p.Age);
+            _ = source.MinMaxBy(p => p.Age);
         });
     }
 

X10D.Tests/src/Linq/Int16Tests.cs

@@ -1,92 +1,95 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Linq;
 
 namespace X10D.Tests.Linq;
 
-[TestClass]
+[TestFixture]
 public class Int16Tests
 {
-    [TestMethod]
+    [Test]
     public void ProductShouldBeCorrect()
     {
         short Cast(int i) => (short)i;
-
-        Assert.AreEqual(0, Enumerable.Range(0, 10).Select(Cast).Product());
-        Assert.AreEqual(1, Enumerable.Range(1, 1).Select(Cast).Product());
-        Assert.AreEqual(2, Enumerable.Range(1, 2).Select(Cast).Product());
-        Assert.AreEqual(6, Enumerable.Range(1, 3).Select(Cast).Product());
-        Assert.AreEqual(24, Enumerable.Range(1, 4).Select(Cast).Product());
-        Assert.AreEqual(120, Enumerable.Range(1, 5).Select(Cast).Product());
-        Assert.AreEqual(720, Enumerable.Range(1, 6).Select(Cast).Product());
-        Assert.AreEqual(5040, Enumerable.Range(1, 7).Select(Cast).Product());
-
-        // 8! will overflow for short
+        Assert.Multiple(() =>
+        {
+            Assert.That(Enumerable.Range(0, 10).Select(Cast).Product(), Is.Zero);
+            Assert.That(Enumerable.Range(1, 1).Select(Cast).Product(), Is.EqualTo(1));
+            Assert.That(Enumerable.Range(1, 2).Select(Cast).Product(), Is.EqualTo(2));
+            Assert.That(Enumerable.Range(1, 3).Select(Cast).Product(), Is.EqualTo(6));
+            Assert.That(Enumerable.Range(1, 4).Select(Cast).Product(), Is.EqualTo(24));
+            Assert.That(Enumerable.Range(1, 5).Select(Cast).Product(), Is.EqualTo(120));
+            Assert.That(Enumerable.Range(1, 6).Select(Cast).Product(), Is.EqualTo(720));
+            Assert.That(Enumerable.Range(1, 7).Select(Cast).Product(), Is.EqualTo(5040));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ProductOfDoublesShouldBeCorrect()
     {
         short Double(int i) => (short)(i * 2);
 
-        Assert.AreEqual(0, Enumerable.Range(0, 10).Product(Double));
-        Assert.AreEqual(2, Enumerable.Range(1, 1).Product(Double));
-        Assert.AreEqual(8, Enumerable.Range(1, 2).Product(Double));
-        Assert.AreEqual(48, Enumerable.Range(1, 3).Product(Double));
-        Assert.AreEqual(384, Enumerable.Range(1, 4).Product(Double));
-        Assert.AreEqual(3840, Enumerable.Range(1, 5).Product(Double));
+        Assert.That(Enumerable.Range(0, 10).Product(Double), Is.Zero);
+        Assert.That(Enumerable.Range(1, 1).Product(Double), Is.EqualTo(2));
+        Assert.That(Enumerable.Range(1, 2).Product(Double), Is.EqualTo(8));
+        Assert.That(Enumerable.Range(1, 3).Product(Double), Is.EqualTo(48));
+        Assert.That(Enumerable.Range(1, 4).Product(Double), Is.EqualTo(384));
+        Assert.That(Enumerable.Range(1, 5).Product(Double), Is.EqualTo(3840));
 
         // Π_(i=1)^n (2i) will overflow at i=6 for short
     }
 
-    [TestMethod]
+    [Test]
     public void Product_ShouldThrowArgumentNullException_GivenNullSource()
     {
         IEnumerable<short> source = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product());
+        Assert.Throws<ArgumentNullException>(() => source.Product());
     }
 
-    [TestMethod]
+    [Test]
     public void RangeTo_Int16_ShouldYieldCorrectValues()
     {
         const short start = 1;
         const short end = 10;
 
         short current = 1;
+
         foreach (short value in start.RangeTo(end))
         {
-            Assert.AreEqual(current++, value);
+            Assert.That(value, Is.EqualTo(current++));
         }
 
-        Assert.AreEqual(current, end);
+        Assert.That(current, Is.EqualTo(end));
     }
 
-    [TestMethod]
+    [Test]
     public void RangeTo_Int32_ShouldYieldCorrectValues()
     {
         const short start = 1;
         const int end = 10;
 
-        int current = 1;
+        var current = 1;
+
         foreach (int value in start.RangeTo(end))
         {
-            Assert.AreEqual(current++, value);
+            Assert.That(value, Is.EqualTo(current++));
         }
 
-        Assert.AreEqual(current, end);
+        Assert.That(current, Is.EqualTo(end));
     }
 
-    [TestMethod]
+    [Test]
     public void RangeTo_Int64_ShouldYieldCorrectValues()
     {
         const short start = 1;
         const long end = 10;
 
         long current = 1;
+
         foreach (long value in start.RangeTo(end))
         {
-            Assert.AreEqual(current++, value);
+            Assert.That(value, Is.EqualTo(current++));
         }
 
-        Assert.AreEqual(current, end);
+        Assert.That(current, Is.EqualTo(end));
     }
 }

X10D.Tests/src/Linq/Int32Tests.cs

@@ -1,55 +1,55 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Linq;
 
 namespace X10D.Tests.Linq;
 
-[TestClass]
+[TestFixture]
 public class Int32Tests
 {
-    [TestMethod]
+    [Test]
     public void ProductShouldBeCorrect()
     {
-        Assert.AreEqual(0, Enumerable.Range(0, 10).Product());
-        Assert.AreEqual(1, Enumerable.Range(1, 1).Product());
-        Assert.AreEqual(2, Enumerable.Range(1, 2).Product());
-        Assert.AreEqual(6, Enumerable.Range(1, 3).Product());
-        Assert.AreEqual(24, Enumerable.Range(1, 4).Product());
-        Assert.AreEqual(120, Enumerable.Range(1, 5).Product());
-        Assert.AreEqual(720, Enumerable.Range(1, 6).Product());
-        Assert.AreEqual(5040, Enumerable.Range(1, 7).Product());
-        Assert.AreEqual(40320, Enumerable.Range(1, 8).Product());
-        Assert.AreEqual(362880, Enumerable.Range(1, 9).Product());
-        Assert.AreEqual(3628800, Enumerable.Range(1, 10).Product());
+        Assert.That(Enumerable.Range(0, 10).Product(), Is.Zero);
+        Assert.That(Enumerable.Range(1, 1).Product(), Is.EqualTo(1));
+        Assert.That(Enumerable.Range(1, 2).Product(), Is.EqualTo(2));
+        Assert.That(Enumerable.Range(1, 3).Product(), Is.EqualTo(6));
+        Assert.That(Enumerable.Range(1, 4).Product(), Is.EqualTo(24));
+        Assert.That(Enumerable.Range(1, 5).Product(), Is.EqualTo(120));
+        Assert.That(Enumerable.Range(1, 6).Product(), Is.EqualTo(720));
+        Assert.That(Enumerable.Range(1, 7).Product(), Is.EqualTo(5040));
+        Assert.That(Enumerable.Range(1, 8).Product(), Is.EqualTo(40320));
+        Assert.That(Enumerable.Range(1, 9).Product(), Is.EqualTo(362880));
+        Assert.That(Enumerable.Range(1, 10).Product(), Is.EqualTo(3628800));
     }
 
-    [TestMethod]
+    [Test]
     public void ProductOfDoublesShouldBeCorrect()
     {
         int Double(int i) => i * 2;
 
-        Assert.AreEqual(0, Enumerable.Range(0, 10).Product(Double));
-        Assert.AreEqual(2, Enumerable.Range(1, 1).Product(Double));
-        Assert.AreEqual(8, Enumerable.Range(1, 2).Product(Double));
-        Assert.AreEqual(48, Enumerable.Range(1, 3).Product(Double));
-        Assert.AreEqual(384, Enumerable.Range(1, 4).Product(Double));
-        Assert.AreEqual(3840, Enumerable.Range(1, 5).Product(Double));
-        Assert.AreEqual(46080, Enumerable.Range(1, 6).Product(Double));
-        Assert.AreEqual(645120, Enumerable.Range(1, 7).Product(Double));
-        Assert.AreEqual(10321920, Enumerable.Range(1, 8).Product(Double));
-        Assert.AreEqual(185794560, Enumerable.Range(1, 9).Product(Double));
+        Assert.That(Enumerable.Range(0, 10).Product(Double), Is.Zero);
+        Assert.That(Enumerable.Range(1, 1).Product(Double), Is.EqualTo(2));
+        Assert.That(Enumerable.Range(1, 2).Product(Double), Is.EqualTo(8));
+        Assert.That(Enumerable.Range(1, 3).Product(Double), Is.EqualTo(48));
+        Assert.That(Enumerable.Range(1, 4).Product(Double), Is.EqualTo(384));
+        Assert.That(Enumerable.Range(1, 5).Product(Double), Is.EqualTo(3840));
+        Assert.That(Enumerable.Range(1, 6).Product(Double), Is.EqualTo(46080));
+        Assert.That(Enumerable.Range(1, 7).Product(Double), Is.EqualTo(645120));
+        Assert.That(Enumerable.Range(1, 8).Product(Double), Is.EqualTo(10321920));
+        Assert.That(Enumerable.Range(1, 9).Product(Double), Is.EqualTo(185794560));
 
         // Π_(i=1)^n (2i) will overflow at i=10 for int
     }
 
-    [TestMethod]
+    [Test]
     public void Product_ShouldThrowArgumentNullException_GivenNullSource()
     {
         IEnumerable<int> source = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product());
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product(v => v));
+        Assert.Throws<ArgumentNullException>(() => source.Product());
+        Assert.Throws<ArgumentNullException>(() => source.Product(v => v));
     }
 
-    [TestMethod]
+    [Test]
     public void RangeTo_Int32_ShouldYieldCorrectValues()
     {
         const int start = 1;
@@ -58,13 +58,13 @@ public class Int32Tests
         int current = 1;
         foreach (int value in start.RangeTo(end))
         {
-            Assert.AreEqual(current++, value);
+            Assert.That(value, Is.EqualTo(current++));
         }
 
-        Assert.AreEqual(current, end);
+        Assert.That(end, Is.EqualTo(current));
     }
 
-    [TestMethod]
+    [Test]
     public void RangeTo_Int64_ShouldYieldCorrectValues()
     {
         const int start = 1;
@@ -73,9 +73,9 @@ public class Int32Tests
         long current = 1;
         foreach (long value in start.RangeTo(end))
         {
-            Assert.AreEqual(current++, value);
+            Assert.That(value, Is.EqualTo(current++));
         }
 
-        Assert.AreEqual(current, end);
+        Assert.That(end, Is.EqualTo(current));
     }
 }

X10D.Tests/src/Linq/Int64Tests.cs

@@ -1,56 +1,56 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Linq;
 
 namespace X10D.Tests.Linq;
 
-[TestClass]
+[TestFixture]
 public class Int64Tests
 {
-    [TestMethod]
+    [Test]
     public void ProductShouldBeCorrect()
     {
         long Cast(int i) => i;
 
-        Assert.AreEqual(0, Enumerable.Range(0, 10).Select(Cast).Product());
-        Assert.AreEqual(1, Enumerable.Range(1, 1).Select(Cast).Product());
-        Assert.AreEqual(2, Enumerable.Range(1, 2).Select(Cast).Product());
-        Assert.AreEqual(6, Enumerable.Range(1, 3).Select(Cast).Product());
-        Assert.AreEqual(24, Enumerable.Range(1, 4).Select(Cast).Product());
-        Assert.AreEqual(120, Enumerable.Range(1, 5).Select(Cast).Product());
-        Assert.AreEqual(720, Enumerable.Range(1, 6).Select(Cast).Product());
-        Assert.AreEqual(5040, Enumerable.Range(1, 7).Select(Cast).Product());
-        Assert.AreEqual(40320, Enumerable.Range(1, 8).Select(Cast).Product());
-        Assert.AreEqual(362880, Enumerable.Range(1, 9).Select(Cast).Product());
-        Assert.AreEqual(3628800, Enumerable.Range(1, 10).Select(Cast).Product());
+        Assert.That(Enumerable.Range(0, 10).Select(Cast).Product(), Is.Zero);
+        Assert.That(Enumerable.Range(1, 1).Select(Cast).Product(), Is.EqualTo(1));
+        Assert.That(Enumerable.Range(1, 2).Select(Cast).Product(), Is.EqualTo(2));
+        Assert.That(Enumerable.Range(1, 3).Select(Cast).Product(), Is.EqualTo(6));
+        Assert.That(Enumerable.Range(1, 4).Select(Cast).Product(), Is.EqualTo(24));
+        Assert.That(Enumerable.Range(1, 5).Select(Cast).Product(), Is.EqualTo(120));
+        Assert.That(Enumerable.Range(1, 6).Select(Cast).Product(), Is.EqualTo(720));
+        Assert.That(Enumerable.Range(1, 7).Select(Cast).Product(), Is.EqualTo(5040));
+        Assert.That(Enumerable.Range(1, 8).Select(Cast).Product(), Is.EqualTo(40320));
+        Assert.That(Enumerable.Range(1, 9).Select(Cast).Product(), Is.EqualTo(362880));
+        Assert.That(Enumerable.Range(1, 10).Select(Cast).Product(), Is.EqualTo(3628800));
     }
 
-    [TestMethod]
+    [Test]
     public void ProductOfDoublesShouldBeCorrect()
     {
         long Double(int i) => i * 2;
 
-        Assert.AreEqual(0, Enumerable.Range(0, 10).Product(Double));
-        Assert.AreEqual(2, Enumerable.Range(1, 1).Product(Double));
-        Assert.AreEqual(8, Enumerable.Range(1, 2).Product(Double));
-        Assert.AreEqual(48, Enumerable.Range(1, 3).Product(Double));
-        Assert.AreEqual(384, Enumerable.Range(1, 4).Product(Double));
-        Assert.AreEqual(3840, Enumerable.Range(1, 5).Product(Double));
-        Assert.AreEqual(46080, Enumerable.Range(1, 6).Product(Double));
-        Assert.AreEqual(645120, Enumerable.Range(1, 7).Product(Double));
-        Assert.AreEqual(10321920, Enumerable.Range(1, 8).Product(Double));
-        Assert.AreEqual(185794560, Enumerable.Range(1, 9).Product(Double));
-        Assert.AreEqual(3715891200, Enumerable.Range(1, 10).Product(Double));
+        Assert.That(Enumerable.Range(0, 10).Product(Double), Is.Zero);
+        Assert.That(Enumerable.Range(1, 1).Product(Double), Is.EqualTo(2));
+        Assert.That(Enumerable.Range(1, 2).Product(Double), Is.EqualTo(8));
+        Assert.That(Enumerable.Range(1, 3).Product(Double), Is.EqualTo(48));
+        Assert.That(Enumerable.Range(1, 4).Product(Double), Is.EqualTo(384));
+        Assert.That(Enumerable.Range(1, 5).Product(Double), Is.EqualTo(3840));
+        Assert.That(Enumerable.Range(1, 6).Product(Double), Is.EqualTo(46080));
+        Assert.That(Enumerable.Range(1, 7).Product(Double), Is.EqualTo(645120));
+        Assert.That(Enumerable.Range(1, 8).Product(Double), Is.EqualTo(10321920));
+        Assert.That(Enumerable.Range(1, 9).Product(Double), Is.EqualTo(185794560));
+        Assert.That(Enumerable.Range(1, 10).Product(Double), Is.EqualTo(3715891200));
     }
 
-    [TestMethod]
+    [Test]
     public void Product_ShouldThrowArgumentNullException_GivenNullSource()
     {
         IEnumerable<long> source = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product());
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product(v => v));
+        Assert.Throws<ArgumentNullException>(() => source.Product());
+        Assert.Throws<ArgumentNullException>(() => source.Product(v => v));
     }
 
-    [TestMethod]
+    [Test]
     public void RangeTo_Int64_ShouldYieldCorrectValues()
     {
         const long start = 1;
@@ -59,9 +59,9 @@ public class Int64Tests
         long current = 1;
         foreach (long value in start.RangeTo(end))
         {
-            Assert.AreEqual(current++, value);
+            Assert.That(value, Is.EqualTo(current++));
         }
 
-        Assert.AreEqual(current, end);
+        Assert.That(end, Is.EqualTo(current));
     }
 }

X10D.Tests/src/Linq/ReadOnlySpanTests.cs

@@ -1,82 +1,82 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Linq;
 
 namespace X10D.Tests.Linq;
 
-[TestClass]
+[TestFixture]
 public class ReadOnlySpanTests
 {
-    [TestMethod]
+    [Test]
     public void AllShouldReturnTrueForEmptySpan()
     {
         var span = new ReadOnlySpan<int>();
-        Assert.IsTrue(span.All(x => x > 0));
+        Assert.That(span.All(x => x > 0));
     }
 
-    [TestMethod]
+    [Test]
     public void AllShouldBeCorrect()
     {
         var span = new ReadOnlySpan<int>(new[] {2, 4, 6, 8, 10});
-        Assert.IsTrue(span.All(x => x % 2 == 0));
-        Assert.IsFalse(span.All(x => x % 2 == 1));
+        Assert.That(span.All(x => x % 2 == 0));
+        Assert.That(span.All(x => x % 2 == 1), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void AnyShouldReturnFalseForEmptySpan()
     {
         var span = new ReadOnlySpan<int>();
-        Assert.IsFalse(span.Any(x => x > 0));
+        Assert.That(span.Any(x => x > 0), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void AnyShouldBeCorrect()
     {
         var span = new ReadOnlySpan<int>(new[] {2, 4, 6, 8, 10});
-        Assert.IsTrue(span.Any(x => x % 2 == 0));
-        Assert.IsFalse(span.Any(x => x % 2 == 1));
+        Assert.That(span.Any(x => x % 2 == 0));
+        Assert.That(span.Any(x => x % 2 == 1), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void AllNullPredicateShouldThrow()
     {
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() =>
         {
             var span = new ReadOnlySpan<int>();
-            return span.All(null!);
+            _ = span.All(null!);
         });
     }
 
-    [TestMethod]
+    [Test]
     public void AnyNullPredicateShouldThrow()
     {
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() =>
         {
             var span = new ReadOnlySpan<int>();
-            return span.Any(null!);
+            _ = span.Any(null!);
         });
     }
 
-    [TestMethod]
+    [Test]
     public void Count_ShouldReturn0_GivenEmptySpan()
     {
         var span = new ReadOnlySpan<int>();
-        Assert.AreEqual(0, span.Count(i => i % 2 == 0));
+        Assert.That(span.Count(i => i % 2 == 0), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Count_ShouldReturn5_ForEvenNumbers_GivenNumbers1To10()
     {
         var span = new ReadOnlySpan<int>(new[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10});
-        Assert.AreEqual(5, span.Count(i => i % 2 == 0));
+        Assert.That(span.Count(i => i % 2 == 0), Is.EqualTo(5));
     }
 
-    [TestMethod]
+    [Test]
     public void Count_ShouldThrow_GivenNullPredicate()
     {
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() =>
         {
             var span = new ReadOnlySpan<int>();
-            return span.Count(null!);
+            _ = span.Count(null!);
         });
     }
 }

X10D.Tests/src/Linq/SByteTests.cs

@@ -1,45 +1,45 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Linq;
 
 namespace X10D.Tests.Linq;
 
-[TestClass]
+[TestFixture]
 [CLSCompliant(false)]
 public class SByteTests
 {
-    [TestMethod]
+    [Test]
     public void ProductShouldBeCorrect()
     {
         sbyte Cast(int i) => (sbyte)i;
 
-        Assert.AreEqual(0, Enumerable.Range(0, 10).Select(Cast).Product());
-        Assert.AreEqual(1, Enumerable.Range(1, 1).Select(Cast).Product());
-        Assert.AreEqual(2, Enumerable.Range(1, 2).Select(Cast).Product());
-        Assert.AreEqual(6, Enumerable.Range(1, 3).Select(Cast).Product());
-        Assert.AreEqual(24, Enumerable.Range(1, 4).Select(Cast).Product());
-        Assert.AreEqual(120, Enumerable.Range(1, 5).Select(Cast).Product());
+        Assert.That(Enumerable.Range(0, 10).Select(Cast).Product(), Is.Zero);
+        Assert.That(Enumerable.Range(1, 1).Select(Cast).Product(), Is.EqualTo(1));
+        Assert.That(Enumerable.Range(1, 2).Select(Cast).Product(), Is.EqualTo(2));
+        Assert.That(Enumerable.Range(1, 3).Select(Cast).Product(), Is.EqualTo(6));
+        Assert.That(Enumerable.Range(1, 4).Select(Cast).Product(), Is.EqualTo(24));
+        Assert.That(Enumerable.Range(1, 5).Select(Cast).Product(), Is.EqualTo(120));
 
         // 6! will overflow for sbyte
     }
 
-    [TestMethod]
+    [Test]
     public void ProductOfDoublesShouldBeCorrect()
     {
         sbyte Double(int i) => (sbyte)(i * 2);
 
-        Assert.AreEqual(0, Enumerable.Range(0, 10).Product(Double));
-        Assert.AreEqual(2, Enumerable.Range(1, 1).Product(Double));
-        Assert.AreEqual(8, Enumerable.Range(1, 2).Product(Double));
-        Assert.AreEqual(48, Enumerable.Range(1, 3).Product(Double));
+        Assert.That(Enumerable.Range(0, 10).Product(Double), Is.Zero);
+        Assert.That(Enumerable.Range(1, 1).Product(Double), Is.EqualTo(2));
+        Assert.That(Enumerable.Range(1, 2).Product(Double), Is.EqualTo(8));
+        Assert.That(Enumerable.Range(1, 3).Product(Double), Is.EqualTo(48));
 
         // Π_(i=1)^(n(i*2)) will overflow at i=4 for sbyte
     }
 
-    [TestMethod]
+    [Test]
     public void Product_ShouldThrowArgumentNullException_GivenNullSource()
     {
         IEnumerable<sbyte> source = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product());
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product(v => v));
+        Assert.Throws<ArgumentNullException>(() => source.Product());
+        Assert.Throws<ArgumentNullException>(() => source.Product(v => v));
     }
 }

X10D.Tests/src/Linq/SingleTests.cs

@@ -1,52 +1,52 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Linq;
 
 namespace X10D.Tests.Linq;
 
-[TestClass]
+[TestFixture]
 public class SingleTests
 {
-    [TestMethod]
+    [Test]
     public void ProductShouldBeCorrect()
     {
         float Cast(int i) => i;
 
-        Assert.AreEqual(0f, Enumerable.Range(0, 10).Select(Cast).Product());
-        Assert.AreEqual(1f, Enumerable.Range(1, 1).Select(Cast).Product());
-        Assert.AreEqual(2f, Enumerable.Range(1, 2).Select(Cast).Product());
-        Assert.AreEqual(6f, Enumerable.Range(1, 3).Select(Cast).Product());
-        Assert.AreEqual(24f, Enumerable.Range(1, 4).Select(Cast).Product());
-        Assert.AreEqual(120f, Enumerable.Range(1, 5).Select(Cast).Product());
-        Assert.AreEqual(720f, Enumerable.Range(1, 6).Select(Cast).Product());
-        Assert.AreEqual(5040f, Enumerable.Range(1, 7).Select(Cast).Product());
-        Assert.AreEqual(40320f, Enumerable.Range(1, 8).Select(Cast).Product());
-        Assert.AreEqual(362880f, Enumerable.Range(1, 9).Select(Cast).Product());
-        Assert.AreEqual(3628800f, Enumerable.Range(1, 10).Select(Cast).Product());
+        Assert.That(Enumerable.Range(0, 10).Select(Cast).Product(), Is.EqualTo(0f));
+        Assert.That(Enumerable.Range(1, 1).Select(Cast).Product(), Is.EqualTo(1f));
+        Assert.That(Enumerable.Range(1, 2).Select(Cast).Product(), Is.EqualTo(2f));
+        Assert.That(Enumerable.Range(1, 3).Select(Cast).Product(), Is.EqualTo(6f));
+        Assert.That(Enumerable.Range(1, 4).Select(Cast).Product(), Is.EqualTo(24f));
+        Assert.That(Enumerable.Range(1, 5).Select(Cast).Product(), Is.EqualTo(120f));
+        Assert.That(Enumerable.Range(1, 6).Select(Cast).Product(), Is.EqualTo(720f));
+        Assert.That(Enumerable.Range(1, 7).Select(Cast).Product(), Is.EqualTo(5040f));
+        Assert.That(Enumerable.Range(1, 8).Select(Cast).Product(), Is.EqualTo(40320f));
+        Assert.That(Enumerable.Range(1, 9).Select(Cast).Product(), Is.EqualTo(362880f));
+        Assert.That(Enumerable.Range(1, 10).Select(Cast).Product(), Is.EqualTo(3628800f));
     }
 
-    [TestMethod]
+    [Test]
     public void ProductOfDoublesShouldBeCorrect()
     {
         float Double(int i) => i * 2f;
 
-        Assert.AreEqual(0f, Enumerable.Range(0, 10).Product(Double));
-        Assert.AreEqual(2f, Enumerable.Range(1, 1).Product(Double));
-        Assert.AreEqual(8f, Enumerable.Range(1, 2).Product(Double));
-        Assert.AreEqual(48f, Enumerable.Range(1, 3).Product(Double));
-        Assert.AreEqual(384f, Enumerable.Range(1, 4).Product(Double));
-        Assert.AreEqual(3840f, Enumerable.Range(1, 5).Product(Double));
-        Assert.AreEqual(46080f, Enumerable.Range(1, 6).Product(Double));
-        Assert.AreEqual(645120f, Enumerable.Range(1, 7).Product(Double));
-        Assert.AreEqual(10321920f, Enumerable.Range(1, 8).Product(Double));
-        Assert.AreEqual(185794560f, Enumerable.Range(1, 9).Product(Double));
-        Assert.AreEqual(3715891200f, Enumerable.Range(1, 10).Product(Double));
+        Assert.That(Enumerable.Range(0, 10).Product(Double), Is.EqualTo(0f));
+        Assert.That(Enumerable.Range(1, 1).Product(Double), Is.EqualTo(2f));
+        Assert.That(Enumerable.Range(1, 2).Product(Double), Is.EqualTo(8f));
+        Assert.That(Enumerable.Range(1, 3).Product(Double), Is.EqualTo(48f));
+        Assert.That(Enumerable.Range(1, 4).Product(Double), Is.EqualTo(384f));
+        Assert.That(Enumerable.Range(1, 5).Product(Double), Is.EqualTo(3840f));
+        Assert.That(Enumerable.Range(1, 6).Product(Double), Is.EqualTo(46080f));
+        Assert.That(Enumerable.Range(1, 7).Product(Double), Is.EqualTo(645120f));
+        Assert.That(Enumerable.Range(1, 8).Product(Double), Is.EqualTo(10321920f));
+        Assert.That(Enumerable.Range(1, 9).Product(Double), Is.EqualTo(185794560f));
+        Assert.That(Enumerable.Range(1, 10).Product(Double), Is.EqualTo(3715891200f));
     }
 
-    [TestMethod]
+    [Test]
     public void Product_ShouldThrowArgumentNullException_GivenNullSource()
     {
         IEnumerable<float> source = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product());
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product(v => v));
+        Assert.Throws<ArgumentNullException>(() => source.Product());
+        Assert.Throws<ArgumentNullException>(() => source.Product(v => v));
     }
 }

X10D.Tests/src/Linq/SpanTests.cs

@@ -1,82 +1,82 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Linq;
 
 namespace X10D.Tests.Linq;
 
-[TestClass]
+[TestFixture]
 public class SpanTests
 {
-    [TestMethod]
+    [Test]
     public void AllShouldReturnTrueForEmptySpan()
     {
         var span = new Span<int>();
-        Assert.IsTrue(span.All(x => x > 0));
+        Assert.That(span.All(x => x > 0));
     }
 
-    [TestMethod]
+    [Test]
     public void AllShouldBeCorrect()
     {
         var span = new Span<int>(new[] {2, 4, 6, 8, 10});
-        Assert.IsTrue(span.All(x => x % 2 == 0));
-        Assert.IsFalse(span.All(x => x % 2 == 1));
+        Assert.That(span.All(x => x % 2 == 0));
+        Assert.That(span.All(x => x % 2 == 1), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void AnyShouldReturnFalseForEmptySpan()
     {
         var span = new Span<int>();
-        Assert.IsFalse(span.Any(x => x > 0));
+        Assert.That(span.Any(x => x > 0), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void AnyShouldBeCorrect()
     {
         var span = new Span<int>(new[] {2, 4, 6, 8, 10});
-        Assert.IsTrue(span.Any(x => x % 2 == 0));
-        Assert.IsFalse(span.Any(x => x % 2 == 1));
+        Assert.That(span.Any(x => x % 2 == 0));
+        Assert.That(span.Any(x => x % 2 == 1), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void AllNullPredicateShouldThrow()
     {
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() =>
         {
             var span = new Span<int>();
-            return span.All(null!);
+            _ = span.All(null!);
         });
     }
 
-    [TestMethod]
+    [Test]
     public void AnyNullPredicateShouldThrow()
     {
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() =>
         {
             var span = new Span<int>();
-            return span.Any(null!);
+            _ = span.Any(null!);
         });
     }
 
-    [TestMethod]
+    [Test]
     public void Count_ShouldReturn0_GivenEmptySpan()
     {
         var span = new Span<int>();
-        Assert.AreEqual(0, span.Count(i => i % 2 == 0));
+        Assert.That(span.Count(i => i % 2 == 0), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Count_ShouldReturn5_ForEvenNumbers_GivenNumbers1To10()
     {
         var span = new Span<int>(new[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10});
-        Assert.AreEqual(5, span.Count(i => i % 2 == 0));
+        Assert.That(span.Count(i => i % 2 == 0), Is.EqualTo(5));
     }
 
-    [TestMethod]
+    [Test]
     public void Count_ShouldThrow_GivenNullPredicate()
     {
-        Assert.ThrowsException<ArgumentNullException>(() =>
+        Assert.Throws<ArgumentNullException>(() =>
         {
             var span = new Span<int>();
-            return span.Count(null!);
+            _ = span.Count(null!);
         });
     }
 }

X10D.Tests/src/Linq/UInt16Tests.cs

@@ -1,51 +1,51 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Linq;
 
 namespace X10D.Tests.Linq;
 
-[TestClass]
+[TestFixture]
 [CLSCompliant(false)]
 public class UInt16Tests
 {
-    [TestMethod]
+    [Test]
     public void ProductShouldBeCorrect()
     {
         ushort Cast(int i) => (ushort)i;
 
-        Assert.AreEqual(0U, Enumerable.Range(0, 10).Select(Cast).Product());
-        Assert.AreEqual(1U, Enumerable.Range(1, 1).Select(Cast).Product());
-        Assert.AreEqual(2U, Enumerable.Range(1, 2).Select(Cast).Product());
-        Assert.AreEqual(6U, Enumerable.Range(1, 3).Select(Cast).Product());
-        Assert.AreEqual(24U, Enumerable.Range(1, 4).Select(Cast).Product());
-        Assert.AreEqual(120U, Enumerable.Range(1, 5).Select(Cast).Product());
-        Assert.AreEqual(720U, Enumerable.Range(1, 6).Select(Cast).Product());
-        Assert.AreEqual(5040U, Enumerable.Range(1, 7).Select(Cast).Product());
-        Assert.AreEqual(40320U, Enumerable.Range(1, 8).Select(Cast).Product());
+        Assert.That(Enumerable.Range(0, 10).Select(Cast).Product(), Is.EqualTo(0U));
+        Assert.That(Enumerable.Range(1, 1).Select(Cast).Product(), Is.EqualTo(1U));
+        Assert.That(Enumerable.Range(1, 2).Select(Cast).Product(), Is.EqualTo(2U));
+        Assert.That(Enumerable.Range(1, 3).Select(Cast).Product(), Is.EqualTo(6U));
+        Assert.That(Enumerable.Range(1, 4).Select(Cast).Product(), Is.EqualTo(24U));
+        Assert.That(Enumerable.Range(1, 5).Select(Cast).Product(), Is.EqualTo(120U));
+        Assert.That(Enumerable.Range(1, 6).Select(Cast).Product(), Is.EqualTo(720U));
+        Assert.That(Enumerable.Range(1, 7).Select(Cast).Product(), Is.EqualTo(5040U));
+        Assert.That(Enumerable.Range(1, 8).Select(Cast).Product(), Is.EqualTo(40320U));
 
         // 9! will overflow for ushort
     }
 
-    [TestMethod]
+    [Test]
     public void ProductOfDoublesShouldBeCorrect()
     {
         ushort Double(int i) => (ushort)(i * 2);
 
-        Assert.AreEqual(0U, Enumerable.Range(0, 10).Product(Double));
-        Assert.AreEqual(2U, Enumerable.Range(1, 1).Product(Double));
-        Assert.AreEqual(8U, Enumerable.Range(1, 2).Product(Double));
-        Assert.AreEqual(48U, Enumerable.Range(1, 3).Product(Double));
-        Assert.AreEqual(384U, Enumerable.Range(1, 4).Product(Double));
-        Assert.AreEqual(3840U, Enumerable.Range(1, 5).Product(Double));
-        Assert.AreEqual(46080U, Enumerable.Range(1, 6).Product(Double));
+        Assert.That(Enumerable.Range(0, 10).Product(Double), Is.EqualTo(0U));
+        Assert.That(Enumerable.Range(1, 1).Product(Double), Is.EqualTo(2U));
+        Assert.That(Enumerable.Range(1, 2).Product(Double), Is.EqualTo(8U));
+        Assert.That(Enumerable.Range(1, 3).Product(Double), Is.EqualTo(48U));
+        Assert.That(Enumerable.Range(1, 4).Product(Double), Is.EqualTo(384U));
+        Assert.That(Enumerable.Range(1, 5).Product(Double), Is.EqualTo(3840U));
+        Assert.That(Enumerable.Range(1, 6).Product(Double), Is.EqualTo(46080U));
 
         // Π_(i=1)^n (2i) will overflow at i=7 for ushort
     }
 
-    [TestMethod]
+    [Test]
     public void Product_ShouldThrowArgumentNullException_GivenNullSource()
     {
         IEnumerable<ushort> source = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product());
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product(v => v));
+        Assert.Throws<ArgumentNullException>(() => source.Product());
+        Assert.Throws<ArgumentNullException>(() => source.Product(v => v));
     }
 }

X10D.Tests/src/Linq/UInt32Tests.cs

@@ -1,53 +1,53 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Linq;
 
 namespace X10D.Tests.Linq;
 
-[TestClass]
+[TestFixture]
 [CLSCompliant(false)]
 public class UInt32Tests
 {
-    [TestMethod]
+    [Test]
     public void ProductShouldBeCorrect()
     {
         ulong Cast(int i) => (ulong)i;
 
-        Assert.AreEqual(0U, Enumerable.Range(0, 10).Select(Cast).Product());
-        Assert.AreEqual(1U, Enumerable.Range(1, 1).Select(Cast).Product());
-        Assert.AreEqual(2U, Enumerable.Range(1, 2).Select(Cast).Product());
-        Assert.AreEqual(6U, Enumerable.Range(1, 3).Select(Cast).Product());
-        Assert.AreEqual(24U, Enumerable.Range(1, 4).Select(Cast).Product());
-        Assert.AreEqual(120U, Enumerable.Range(1, 5).Select(Cast).Product());
-        Assert.AreEqual(720U, Enumerable.Range(1, 6).Select(Cast).Product());
-        Assert.AreEqual(5040U, Enumerable.Range(1, 7).Select(Cast).Product());
-        Assert.AreEqual(40320U, Enumerable.Range(1, 8).Select(Cast).Product());
-        Assert.AreEqual(362880U, Enumerable.Range(1, 9).Select(Cast).Product());
-        Assert.AreEqual(3628800U, Enumerable.Range(1, 10).Select(Cast).Product());
+        Assert.That(Enumerable.Range(0, 10).Select(Cast).Product(), Is.EqualTo(0U));
+        Assert.That(Enumerable.Range(1, 1).Select(Cast).Product(), Is.EqualTo(1U));
+        Assert.That(Enumerable.Range(1, 2).Select(Cast).Product(), Is.EqualTo(2U));
+        Assert.That(Enumerable.Range(1, 3).Select(Cast).Product(), Is.EqualTo(6U));
+        Assert.That(Enumerable.Range(1, 4).Select(Cast).Product(), Is.EqualTo(24U));
+        Assert.That(Enumerable.Range(1, 5).Select(Cast).Product(), Is.EqualTo(120U));
+        Assert.That(Enumerable.Range(1, 6).Select(Cast).Product(), Is.EqualTo(720U));
+        Assert.That(Enumerable.Range(1, 7).Select(Cast).Product(), Is.EqualTo(5040U));
+        Assert.That(Enumerable.Range(1, 8).Select(Cast).Product(), Is.EqualTo(40320U));
+        Assert.That(Enumerable.Range(1, 9).Select(Cast).Product(), Is.EqualTo(362880U));
+        Assert.That(Enumerable.Range(1, 10).Select(Cast).Product(), Is.EqualTo(3628800U));
     }
 
-    [TestMethod]
+    [Test]
     public void ProductOfDoublesShouldBeCorrect()
     {
         uint Double(int i) => (uint)i * 2;
 
-        Assert.AreEqual(0U, Enumerable.Range(0, 10).Product(Double));
-        Assert.AreEqual(2U, Enumerable.Range(1, 1).Product(Double));
-        Assert.AreEqual(8U, Enumerable.Range(1, 2).Product(Double));
-        Assert.AreEqual(48U, Enumerable.Range(1, 3).Product(Double));
-        Assert.AreEqual(384U, Enumerable.Range(1, 4).Product(Double));
-        Assert.AreEqual(3840U, Enumerable.Range(1, 5).Product(Double));
-        Assert.AreEqual(46080U, Enumerable.Range(1, 6).Product(Double));
-        Assert.AreEqual(645120U, Enumerable.Range(1, 7).Product(Double));
-        Assert.AreEqual(10321920U, Enumerable.Range(1, 8).Product(Double));
-        Assert.AreEqual(185794560U, Enumerable.Range(1, 9).Product(Double));
-        Assert.AreEqual(3715891200U, Enumerable.Range(1, 10).Product(Double));
+        Assert.That(Enumerable.Range(0, 10).Product(Double), Is.EqualTo(0U));
+        Assert.That(Enumerable.Range(1, 1).Product(Double), Is.EqualTo(2U));
+        Assert.That(Enumerable.Range(1, 2).Product(Double), Is.EqualTo(8U));
+        Assert.That(Enumerable.Range(1, 3).Product(Double), Is.EqualTo(48U));
+        Assert.That(Enumerable.Range(1, 4).Product(Double), Is.EqualTo(384U));
+        Assert.That(Enumerable.Range(1, 5).Product(Double), Is.EqualTo(3840U));
+        Assert.That(Enumerable.Range(1, 6).Product(Double), Is.EqualTo(46080U));
+        Assert.That(Enumerable.Range(1, 7).Product(Double), Is.EqualTo(645120U));
+        Assert.That(Enumerable.Range(1, 8).Product(Double), Is.EqualTo(10321920U));
+        Assert.That(Enumerable.Range(1, 9).Product(Double), Is.EqualTo(185794560U));
+        Assert.That(Enumerable.Range(1, 10).Product(Double), Is.EqualTo(3715891200U));
     }
 
-    [TestMethod]
+    [Test]
     public void Product_ShouldThrowArgumentNullException_GivenNullSource()
     {
         IEnumerable<uint> source = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product());
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product(v => v));
+        Assert.Throws<ArgumentNullException>(() => source.Product());
+        Assert.Throws<ArgumentNullException>(() => source.Product(v => v));
     }
 }

X10D.Tests/src/Linq/UInt64Tests.cs

@@ -1,53 +1,53 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Linq;
 
 namespace X10D.Tests.Linq;
 
-[TestClass]
+[TestFixture]
 [CLSCompliant(false)]
 public class UInt64Tests
 {
-    [TestMethod]
+    [Test]
     public void ProductShouldBeCorrect()
     {
         ulong Cast(int i) => (ulong)i;
 
-        Assert.AreEqual(0UL, Enumerable.Range(0, 10).Select(Cast).Product());
-        Assert.AreEqual(1UL, Enumerable.Range(1, 1).Select(Cast).Product());
-        Assert.AreEqual(2UL, Enumerable.Range(1, 2).Select(Cast).Product());
-        Assert.AreEqual(6UL, Enumerable.Range(1, 3).Select(Cast).Product());
-        Assert.AreEqual(24UL, Enumerable.Range(1, 4).Select(Cast).Product());
-        Assert.AreEqual(120UL, Enumerable.Range(1, 5).Select(Cast).Product());
-        Assert.AreEqual(720UL, Enumerable.Range(1, 6).Select(Cast).Product());
-        Assert.AreEqual(5040UL, Enumerable.Range(1, 7).Select(Cast).Product());
-        Assert.AreEqual(40320UL, Enumerable.Range(1, 8).Select(Cast).Product());
-        Assert.AreEqual(362880UL, Enumerable.Range(1, 9).Select(Cast).Product());
-        Assert.AreEqual(3628800UL, Enumerable.Range(1, 10).Select(Cast).Product());
+        Assert.That(Enumerable.Range(0, 10).Select(Cast).Product(), Is.EqualTo(0UL));
+        Assert.That(Enumerable.Range(1, 1).Select(Cast).Product(), Is.EqualTo(1UL));
+        Assert.That(Enumerable.Range(1, 2).Select(Cast).Product(), Is.EqualTo(2UL));
+        Assert.That(Enumerable.Range(1, 3).Select(Cast).Product(), Is.EqualTo(6UL));
+        Assert.That(Enumerable.Range(1, 4).Select(Cast).Product(), Is.EqualTo(24UL));
+        Assert.That(Enumerable.Range(1, 5).Select(Cast).Product(), Is.EqualTo(120UL));
+        Assert.That(Enumerable.Range(1, 6).Select(Cast).Product(), Is.EqualTo(720UL));
+        Assert.That(Enumerable.Range(1, 7).Select(Cast).Product(), Is.EqualTo(5040UL));
+        Assert.That(Enumerable.Range(1, 8).Select(Cast).Product(), Is.EqualTo(40320UL));
+        Assert.That(Enumerable.Range(1, 9).Select(Cast).Product(), Is.EqualTo(362880UL));
+        Assert.That(Enumerable.Range(1, 10).Select(Cast).Product(), Is.EqualTo(3628800UL));
     }
 
-    [TestMethod]
+    [Test]
     public void ProductOfDoublesShouldBeCorrect()
     {
         ulong Double(int i) => (ulong)i * 2;
 
-        Assert.AreEqual(0UL, Enumerable.Range(0, 10).Product(Double));
-        Assert.AreEqual(2UL, Enumerable.Range(1, 1).Product(Double));
-        Assert.AreEqual(8UL, Enumerable.Range(1, 2).Product(Double));
-        Assert.AreEqual(48UL, Enumerable.Range(1, 3).Product(Double));
-        Assert.AreEqual(384UL, Enumerable.Range(1, 4).Product(Double));
-        Assert.AreEqual(3840UL, Enumerable.Range(1, 5).Product(Double));
-        Assert.AreEqual(46080UL, Enumerable.Range(1, 6).Product(Double));
-        Assert.AreEqual(645120UL, Enumerable.Range(1, 7).Product(Double));
-        Assert.AreEqual(10321920UL, Enumerable.Range(1, 8).Product(Double));
-        Assert.AreEqual(185794560UL, Enumerable.Range(1, 9).Product(Double));
-        Assert.AreEqual(3715891200UL, Enumerable.Range(1, 10).Product(Double));
+        Assert.That(Enumerable.Range(0, 10).Product(Double), Is.EqualTo(0UL));
+        Assert.That(Enumerable.Range(1, 1).Product(Double), Is.EqualTo(2UL));
+        Assert.That(Enumerable.Range(1, 2).Product(Double), Is.EqualTo(8UL));
+        Assert.That(Enumerable.Range(1, 3).Product(Double), Is.EqualTo(48UL));
+        Assert.That(Enumerable.Range(1, 4).Product(Double), Is.EqualTo(384UL));
+        Assert.That(Enumerable.Range(1, 5).Product(Double), Is.EqualTo(3840UL));
+        Assert.That(Enumerable.Range(1, 6).Product(Double), Is.EqualTo(46080UL));
+        Assert.That(Enumerable.Range(1, 7).Product(Double), Is.EqualTo(645120UL));
+        Assert.That(Enumerable.Range(1, 8).Product(Double), Is.EqualTo(10321920UL));
+        Assert.That(Enumerable.Range(1, 9).Product(Double), Is.EqualTo(185794560UL));
+        Assert.That(Enumerable.Range(1, 10).Product(Double), Is.EqualTo(3715891200UL));
     }
 
-    [TestMethod]
+    [Test]
     public void Product_ShouldThrowArgumentNullException_GivenNullSource()
     {
         IEnumerable<ulong> source = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product());
-        Assert.ThrowsException<ArgumentNullException>(() => source.Product(v => v));
+        Assert.Throws<ArgumentNullException>(() => source.Product());
+        Assert.Throws<ArgumentNullException>(() => source.Product(v => v));
     }
 }

X10D.Tests/src/Math/BigIntegerTests.Wrap.cs

@@ -1,15 +1,15 @@
 using System.Numerics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Math;
 
 namespace X10D.Tests.Math;
 
 public partial class BigIntegerTests
 {
-    [TestClass]
+    [TestFixture]
     public class WrapTests
     {
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnLow_WhenValueIsEqualToLow()
         {
             BigInteger value = 10;
@@ -18,10 +18,10 @@ public partial class BigIntegerTests
 
             BigInteger result = value.Wrap(low, high);
 
-            Assert.AreEqual(low, result);
+            Assert.That(result, Is.EqualTo(low));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnHigh_WhenValueIsEqualToHigh()
         {
             BigInteger value = 20;
@@ -30,10 +30,10 @@ public partial class BigIntegerTests
 
             BigInteger result = value.Wrap(low, high);
 
-            Assert.AreEqual(low, result);
+            Assert.That(result, Is.EqualTo(low));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsGreaterThanHigh()
         {
             BigInteger value = 30;
@@ -42,10 +42,10 @@ public partial class BigIntegerTests
 
             BigInteger result = value.Wrap(low, high);
 
-            Assert.AreEqual(low, result);
+            Assert.That(result, Is.EqualTo(low));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsLessThanLow()
         {
             BigInteger value = 5;
@@ -54,10 +54,10 @@ public partial class BigIntegerTests
 
             BigInteger result = value.Wrap(low, high);
 
-            Assert.AreEqual(15L, result);
+            Assert.That(result, Is.EqualTo((BigInteger)15));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsInBetweenLowAndHigh()
         {
             BigInteger value = 15;
@@ -66,10 +66,10 @@ public partial class BigIntegerTests
 
             BigInteger result = value.Wrap(low, high);
 
-            Assert.AreEqual(value, result);
+            Assert.That(result, Is.EqualTo(value));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnZero_WhenValueIsEqualToLength()
         {
             BigInteger value = 10;
@@ -77,10 +77,10 @@ public partial class BigIntegerTests
 
             BigInteger result = value.Wrap(length);
 
-            Assert.AreEqual(0L, result);
+            Assert.That(result, Is.EqualTo((BigInteger)0));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnValue_WhenValueIsLessThanLength()
         {
             BigInteger value = 5;
@@ -88,10 +88,10 @@ public partial class BigIntegerTests
 
             BigInteger result = value.Wrap(length);
 
-            Assert.AreEqual(value, result);
+            Assert.That(result, Is.EqualTo(value));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsGreaterThanLength()
         {
             BigInteger value = 15;
@@ -99,7 +99,7 @@ public partial class BigIntegerTests
 
             BigInteger result = value.Wrap(length);
 
-            Assert.AreEqual(5L, result);
+            Assert.That(result, Is.EqualTo((BigInteger)5));
         }
     }
 }

X10D.Tests/src/Math/BigIntegerTests.cs

@@ -1,69 +1,74 @@
 using System.Numerics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Math;
 
 namespace X10D.Tests.Math;
 
-[TestClass]
+[TestFixture]
 public partial class BigIntegerTests
 {
-    [TestMethod]
+    [Test]
     public void DigitalRootShouldBeCorrect()
     {
         BigInteger value = 238;
-        Assert.AreEqual(4, value.DigitalRoot());
-        Assert.AreEqual(4, (-value).DigitalRoot());
+        Assert.That(value.DigitalRoot(), Is.EqualTo(4));
+        Assert.That((-value).DigitalRoot(), Is.EqualTo(4));
     }
 
-    [TestMethod]
+    [Test]
     public void FactorialShouldBeCorrect()
     {
-        Assert.AreEqual(1, ((BigInteger)0).Factorial());
-        Assert.AreEqual(1, ((BigInteger)1).Factorial());
-        Assert.AreEqual(2, ((BigInteger)2).Factorial());
-        Assert.AreEqual(6, ((BigInteger)3).Factorial());
-        Assert.AreEqual(24, ((BigInteger)4).Factorial());
-        Assert.AreEqual(120, ((BigInteger)5).Factorial());
-        Assert.AreEqual(720, ((BigInteger)6).Factorial());
-        Assert.AreEqual(5040, ((BigInteger)7).Factorial());
-        Assert.AreEqual(40320, ((BigInteger)8).Factorial());
-        Assert.AreEqual(362880, ((BigInteger)9).Factorial());
-        Assert.AreEqual(3628800, ((BigInteger)10).Factorial());
+        Assert.Multiple(() =>
+        {
+            Assert.That(((BigInteger)0).Factorial(), Is.EqualTo((BigInteger)1));
+            Assert.That(((BigInteger)1).Factorial(), Is.EqualTo((BigInteger)1));
+            Assert.That(((BigInteger)2).Factorial(), Is.EqualTo((BigInteger)2));
+            Assert.That(((BigInteger)3).Factorial(), Is.EqualTo((BigInteger)6));
+            Assert.That(((BigInteger)4).Factorial(), Is.EqualTo((BigInteger)24));
+            Assert.That(((BigInteger)5).Factorial(), Is.EqualTo((BigInteger)120));
+            Assert.That(((BigInteger)6).Factorial(), Is.EqualTo((BigInteger)720));
+            Assert.That(((BigInteger)7).Factorial(), Is.EqualTo((BigInteger)5040));
+            Assert.That(((BigInteger)8).Factorial(), Is.EqualTo((BigInteger)40320));
+            Assert.That(((BigInteger)9).Factorial(), Is.EqualTo((BigInteger)362880));
+            Assert.That(((BigInteger)10).Factorial(), Is.EqualTo((BigInteger)3628800));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void GreatestCommonFactor_ShouldBe1_ForPrimeNumbers()
     {
-        BigInteger first = 5L;
-        BigInteger second = 7L;
+        BigInteger first = 5;
+        BigInteger second = 7;
 
         BigInteger multiple = first.GreatestCommonFactor(second);
 
-        Assert.AreEqual(1L, multiple);
+        Assert.That(multiple, Is.EqualTo((BigInteger)1));
     }
 
-    [TestMethod]
+    [Test]
     public void GreatestCommonFactor_ShouldBe6_Given12And18()
     {
-        BigInteger first = 12L;
-        BigInteger second = 18L;
+        BigInteger first = 12;
+        BigInteger second = 18;
 
         BigInteger multiple = first.GreatestCommonFactor(second);
 
-        Assert.AreEqual(6L, multiple);
+        Assert.That(multiple, Is.EqualTo((BigInteger)6));
     }
 
-    [TestMethod]
+    [Test]
     public void IsOddShouldBeCorrect()
     {
         BigInteger one = 1;
         BigInteger two = 2;
-
-        Assert.IsTrue(one.IsOdd());
-        Assert.IsFalse(two.IsOdd());
+        Assert.Multiple(() =>
+        {
+            Assert.That(one.IsOdd());
+            Assert.That(two.IsOdd(), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void LowestCommonMultiple_ShouldReturnCorrectValue_WhenCalledWithValidInput()
     {
         BigInteger value1 = 2;
@@ -72,10 +77,10 @@ public partial class BigIntegerTests
 
         BigInteger result = value1.LowestCommonMultiple(value2);
 
-        Assert.AreEqual(expected, result);
+        Assert.That(result, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void LowestCommonMultiple_ShouldReturnZero_WhenCalledWithZero()
     {
         BigInteger value1 = 0;
@@ -84,10 +89,10 @@ public partial class BigIntegerTests
 
         BigInteger result = value1.LowestCommonMultiple(value2);
 
-        Assert.AreEqual(expected, result);
+        Assert.That(result, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void LowestCommonMultiple_ShouldReturnGreaterValue_WhenCalledWithOne()
     {
         BigInteger value1 = 1;
@@ -97,11 +102,11 @@ public partial class BigIntegerTests
         BigInteger result1 = value1.LowestCommonMultiple(value2);
         BigInteger result2 = value2.LowestCommonMultiple(value1);
 
-        Assert.AreEqual(expected, result1);
-        Assert.AreEqual(expected, result2);
+        Assert.That(result1, Is.EqualTo(expected));
+        Assert.That(result2, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void LowestCommonMultiple_ShouldReturnOtherValue_WhenCalledWithSameValue()
     {
         BigInteger value1 = 5;
@@ -110,10 +115,10 @@ public partial class BigIntegerTests
 
         BigInteger result = value1.LowestCommonMultiple(value2);
 
-        Assert.AreEqual(expected, result);
+        Assert.That(result, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void LowestCommonMultiple_ShouldReturnCorrectValue_WhenCalledWithNegativeValues()
     {
         BigInteger value1 = -2;
@@ -122,38 +127,44 @@ public partial class BigIntegerTests
 
         BigInteger result = value1.LowestCommonMultiple(value2);
 
-        Assert.AreEqual(expected, result);
+        Assert.That(result, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void MultiplicativePersistence_ShouldReturn1_ForAnyDigitBeing0()
     {
-        Assert.AreEqual(1, ((BigInteger)10).MultiplicativePersistence());
-        Assert.AreEqual(1, ((BigInteger)201).MultiplicativePersistence());
-        Assert.AreEqual(1, ((BigInteger)200).MultiplicativePersistence());
-        Assert.AreEqual(1, ((BigInteger)20007).MultiplicativePersistence());
+        Assert.Multiple(() =>
+        {
+            Assert.That(((BigInteger)10).MultiplicativePersistence(), Is.EqualTo(1));
+            Assert.That(((BigInteger)201).MultiplicativePersistence(), Is.EqualTo(1));
+            Assert.That(((BigInteger)200).MultiplicativePersistence(), Is.EqualTo(1));
+            Assert.That(((BigInteger)20007).MultiplicativePersistence(), Is.EqualTo(1));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void MultiplicativePersistence_ShouldBeCorrect_ForRecordHolders()
     {
-        Assert.AreEqual(0, ((BigInteger)0).MultiplicativePersistence());
-        Assert.AreEqual(1, ((BigInteger)10).MultiplicativePersistence());
-        Assert.AreEqual(2, ((BigInteger)25).MultiplicativePersistence());
-        Assert.AreEqual(3, ((BigInteger)39).MultiplicativePersistence());
-        Assert.AreEqual(4, ((BigInteger)77).MultiplicativePersistence());
-        Assert.AreEqual(5, ((BigInteger)679).MultiplicativePersistence());
-        Assert.AreEqual(6, ((BigInteger)6788).MultiplicativePersistence());
-        Assert.AreEqual(7, ((BigInteger)68889).MultiplicativePersistence());
-        Assert.AreEqual(8, ((BigInteger)2677889).MultiplicativePersistence());
-        Assert.AreEqual(9, ((BigInteger)26888999).MultiplicativePersistence());
-        Assert.AreEqual(10, ((BigInteger)3778888999).MultiplicativePersistence());
-        Assert.AreEqual(11, ((BigInteger)277777788888899).MultiplicativePersistence());
+        Assert.Multiple(() =>
+        {
+            Assert.That(((BigInteger)0).MultiplicativePersistence(), Is.Zero);
+            Assert.That(((BigInteger)10).MultiplicativePersistence(), Is.EqualTo(1));
+            Assert.That(((BigInteger)25).MultiplicativePersistence(), Is.EqualTo(2));
+            Assert.That(((BigInteger)39).MultiplicativePersistence(), Is.EqualTo(3));
+            Assert.That(((BigInteger)77).MultiplicativePersistence(), Is.EqualTo(4));
+            Assert.That(((BigInteger)679).MultiplicativePersistence(), Is.EqualTo(5));
+            Assert.That(((BigInteger)6788).MultiplicativePersistence(), Is.EqualTo(6));
+            Assert.That(((BigInteger)68889).MultiplicativePersistence(), Is.EqualTo(7));
+            Assert.That(((BigInteger)2677889).MultiplicativePersistence(), Is.EqualTo(8));
+            Assert.That(((BigInteger)26888999).MultiplicativePersistence(), Is.EqualTo(9));
+            Assert.That(((BigInteger)3778888999).MultiplicativePersistence(), Is.EqualTo(10));
+            Assert.That(((BigInteger)277777788888899).MultiplicativePersistence(), Is.EqualTo(11));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void NegativeFactorialShouldThrow()
     {
-        Assert.ThrowsException<ArithmeticException>(() => ((BigInteger)(-1)).Factorial());
+        Assert.Throws<ArithmeticException>(() => _ = ((BigInteger)(-1)).Factorial());
     }
 }

X10D.Tests/src/Math/ByteTests.Wrap.cs

@@ -1,14 +1,14 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Math;
 
 namespace X10D.Tests.Math;
 
 public partial class ByteTests
 {
-    [TestClass]
+    [TestFixture]
     public class WrapTests
     {
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnLow_WhenValueIsEqualToLow()
         {
             const byte value = 10;
@@ -17,10 +17,10 @@ public partial class ByteTests
 
             byte result = value.Wrap(low, high);
 
-            Assert.AreEqual(low, result);
+            Assert.That(result, Is.EqualTo(low));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnHigh_WhenValueIsEqualToHigh()
         {
             const byte value = 20;
@@ -29,10 +29,10 @@ public partial class ByteTests
 
             byte result = value.Wrap(low, high);
 
-            Assert.AreEqual(low, result);
+            Assert.That(result, Is.EqualTo(low));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsGreaterThanHigh()
         {
             const byte value = 30;
@@ -41,10 +41,10 @@ public partial class ByteTests
 
             byte result = value.Wrap(low, high);
 
-            Assert.AreEqual(low, result);
+            Assert.That(result, Is.EqualTo(low));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsLessThanLow()
         {
             const byte value = 5;
@@ -53,10 +53,10 @@ public partial class ByteTests
 
             byte result = value.Wrap(low, high);
 
-            Assert.AreEqual(11, result);
+            Assert.That(result, Is.EqualTo(11));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsInBetweenLowAndHigh()
         {
             const byte value = 15;
@@ -65,10 +65,10 @@ public partial class ByteTests
 
             byte result = value.Wrap(low, high);
 
-            Assert.AreEqual(value, result);
+            Assert.That(result, Is.EqualTo(value));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnZero_WhenValueIsEqualToLength()
         {
             const byte value = 10;
@@ -76,10 +76,10 @@ public partial class ByteTests
 
             byte result = value.Wrap(length);
 
-            Assert.AreEqual(0, result);
+            Assert.That(result, Is.Zero);
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnValue_WhenValueIsLessThanLength()
         {
             const byte value = 5;
@@ -87,10 +87,10 @@ public partial class ByteTests
 
             byte result = value.Wrap(length);
 
-            Assert.AreEqual(value, result);
+            Assert.That(result, Is.EqualTo(value));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsGreaterThanLength()
         {
             const byte value = 15;
@@ -98,7 +98,7 @@ public partial class ByteTests
 
             byte result = value.Wrap(length);
 
-            Assert.AreEqual(5, result);
+            Assert.That(result, Is.EqualTo(5));
         }
     }
 }

X10D.Tests/src/Math/ByteTests.cs

@@ -1,36 +1,36 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Math;
 
 namespace X10D.Tests.Math;
 
-[TestClass]
+[TestFixture]
 public partial class ByteTests
 {
-    [TestMethod]
+    [Test]
     public void DigitalRootShouldBeCorrect()
     {
         const byte value = 238;
-        Assert.AreEqual(4, value.DigitalRoot());
-        Assert.AreEqual(4, (-value).DigitalRoot());
+        Assert.That(value.DigitalRoot(), Is.EqualTo(4));
+        Assert.That((-value).DigitalRoot(), Is.EqualTo(4));
     }
 
-    [TestMethod]
+    [Test]
     public void FactorialShouldBeCorrect()
     {
-        Assert.AreEqual(1L, ((byte)0).Factorial());
-        Assert.AreEqual(1L, ((byte)1).Factorial());
-        Assert.AreEqual(2L, ((byte)2).Factorial());
-        Assert.AreEqual(6L, ((byte)3).Factorial());
-        Assert.AreEqual(24L, ((byte)4).Factorial());
-        Assert.AreEqual(120L, ((byte)5).Factorial());
-        Assert.AreEqual(720L, ((byte)6).Factorial());
-        Assert.AreEqual(5040L, ((byte)7).Factorial());
-        Assert.AreEqual(40320L, ((byte)8).Factorial());
-        Assert.AreEqual(362880L, ((byte)9).Factorial());
-        Assert.AreEqual(3628800L, ((byte)10).Factorial());
+        Assert.That(((byte)0).Factorial(), Is.EqualTo(1L));
+        Assert.That(((byte)1).Factorial(), Is.EqualTo(1L));
+        Assert.That(((byte)2).Factorial(), Is.EqualTo(2L));
+        Assert.That(((byte)3).Factorial(), Is.EqualTo(6L));
+        Assert.That(((byte)4).Factorial(), Is.EqualTo(24L));
+        Assert.That(((byte)5).Factorial(), Is.EqualTo(120L));
+        Assert.That(((byte)6).Factorial(), Is.EqualTo(720L));
+        Assert.That(((byte)7).Factorial(), Is.EqualTo(5040L));
+        Assert.That(((byte)8).Factorial(), Is.EqualTo(40320L));
+        Assert.That(((byte)9).Factorial(), Is.EqualTo(362880L));
+        Assert.That(((byte)10).Factorial(), Is.EqualTo(3628800L));
     }
 
-    [TestMethod]
+    [Test]
     public void GreatestCommonFactor_ShouldBe1_ForPrimeNumbers()
     {
         const byte first = 5;
@@ -38,10 +38,10 @@ public partial class ByteTests
 
         byte multiple = first.GreatestCommonFactor(second);
 
-        Assert.AreEqual(1, multiple);
+        Assert.That(multiple, Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void GreatestCommonFactor_ShouldBe6_Given12And18()
     {
         const byte first = 12;
@@ -49,30 +49,30 @@ public partial class ByteTests
 
         byte multiple = first.GreatestCommonFactor(second);
 
-        Assert.AreEqual(6, multiple);
+        Assert.That(multiple, Is.EqualTo(6));
     }
 
-    [TestMethod]
+    [Test]
     public void IsEvenShouldBeCorrect()
     {
         const byte one = 1;
         const byte two = 2;
 
-        Assert.IsFalse(one.IsEven());
-        Assert.IsTrue(two.IsEven());
+        Assert.That(one.IsEven(), Is.False);
+        Assert.That(two.IsEven());
     }
 
-    [TestMethod]
+    [Test]
     public void IsOddShouldBeCorrect()
     {
         const byte one = 1;
         const byte two = 2;
 
-        Assert.IsTrue(one.IsOdd());
-        Assert.IsFalse(two.IsOdd());
+        Assert.That(one.IsOdd());
+        Assert.That(two.IsOdd(), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void LowestCommonMultiple_ShouldReturnCorrectValue_WhenCalledWithValidInput()
     {
         const byte value1 = 2;
@@ -81,10 +81,10 @@ public partial class ByteTests
 
         byte result = value1.LowestCommonMultiple(value2);
 
-        Assert.AreEqual(expected, result);
+        Assert.That(result, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void LowestCommonMultiple_ShouldReturnZero_WhenCalledWithZero()
     {
         const byte value1 = 0;
@@ -93,10 +93,10 @@ public partial class ByteTests
 
         byte result = value1.LowestCommonMultiple(value2);
 
-        Assert.AreEqual(expected, result);
+        Assert.That(result, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void LowestCommonMultiple_ShouldReturnGreaterValue_WhenCalledWithOne()
     {
         const byte value1 = 1;
@@ -106,11 +106,11 @@ public partial class ByteTests
         byte result1 = value1.LowestCommonMultiple(value2);
         byte result2 = value2.LowestCommonMultiple(value1);
 
-        Assert.AreEqual(expected, result1);
-        Assert.AreEqual(expected, result2);
+        Assert.That(result1, Is.EqualTo(expected));
+        Assert.That(result2, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void LowestCommonMultiple_ShouldReturnOtherValue_WhenCalledWithSameValue()
     {
         const byte value1 = 5;
@@ -119,25 +119,25 @@ public partial class ByteTests
 
         byte result = value1.LowestCommonMultiple(value2);
 
-        Assert.AreEqual(expected, result);
+        Assert.That(result, Is.EqualTo(expected));
     }
 
-    [TestMethod]
+    [Test]
     public void MultiplicativePersistence_ShouldReturn1_ForAnyDigitBeing0()
     {
-        Assert.AreEqual(1, ((byte)10).MultiplicativePersistence());
-        Assert.AreEqual(1, ((byte)201).MultiplicativePersistence());
-        Assert.AreEqual(1, ((byte)200).MultiplicativePersistence());
-        Assert.AreEqual(1, ((byte)207).MultiplicativePersistence());
+        Assert.That(((byte)10).MultiplicativePersistence(), Is.EqualTo(1));
+        Assert.That(((byte)201).MultiplicativePersistence(), Is.EqualTo(1));
+        Assert.That(((byte)200).MultiplicativePersistence(), Is.EqualTo(1));
+        Assert.That(((byte)207).MultiplicativePersistence(), Is.EqualTo(1));
     }
 
-    [TestMethod]
+    [Test]
     public void MultiplicativePersistence_ShouldBeCorrect_ForRecordHolders()
     {
-        Assert.AreEqual(0, ((byte)0).MultiplicativePersistence());
-        Assert.AreEqual(1, ((byte)10).MultiplicativePersistence());
-        Assert.AreEqual(2, ((byte)25).MultiplicativePersistence());
-        Assert.AreEqual(3, ((byte)39).MultiplicativePersistence());
-        Assert.AreEqual(4, ((byte)77).MultiplicativePersistence());
+        Assert.That(((byte)0).MultiplicativePersistence(), Is.Zero);
+        Assert.That(((byte)10).MultiplicativePersistence(), Is.EqualTo(1));
+        Assert.That(((byte)25).MultiplicativePersistence(), Is.EqualTo(2));
+        Assert.That(((byte)39).MultiplicativePersistence(), Is.EqualTo(3));
+        Assert.That(((byte)77).MultiplicativePersistence(), Is.EqualTo(4));
     }
 }

X10D.Tests/src/Math/ComparableTests.cs

@@ -1,9 +1,9 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Math;
 
 namespace X10D.Tests.Math;
 
-[TestClass]
+[TestFixture]
 public class ComparableTests
 {
     private class ComparableTestClass : IComparable<ComparableTestClass>
@@ -18,191 +18,191 @@ public class ComparableTests
     private readonly int _upper = 10;
     private readonly int _value = 5;
 
-    [TestMethod]
+    [Test]
     public void Between_5_1_10_ShouldBeTrue()
     {
-        Assert.IsTrue(_value.Between(_lower, _upper));
+        Assert.That(_value.Between(_lower, _upper));
     }
 
-    [TestMethod]
+    [Test]
     public void Between_1_1_10_ShouldBeFalse()
     {
         // default option is exclusive
-        Assert.IsFalse(_lower.Between(_lower, _upper));
+        Assert.That(_lower.Between(_lower, _upper), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void Between_1_1_10_Inclusive_ShouldBeTrue()
     {
-        Assert.IsTrue(_lower.Between(_lower, _upper, InclusiveOptions.Inclusive));
-        Assert.IsTrue(_lower.Between(_lower, _upper, InclusiveOptions.LowerInclusive));
-        Assert.IsFalse(_lower.Between(_lower, _upper, InclusiveOptions.UpperInclusive));
+        Assert.That(_lower.Between(_lower, _upper, InclusiveOptions.Inclusive));
+        Assert.That(_lower.Between(_lower, _upper, InclusiveOptions.LowerInclusive));
+        Assert.That(_lower.Between(_lower, _upper, InclusiveOptions.UpperInclusive), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void Between_10_1_10_ShouldBeFalse()
     {
         // default option is exclusive
-        Assert.IsFalse(_upper.Between(_lower, _upper));
+        Assert.That(_upper.Between(_lower, _upper), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void Between_10_1_10_Inclusive_ShouldBeTrue()
     {
-        Assert.IsTrue(_upper.Between(_lower, _upper, InclusiveOptions.Inclusive));
-        Assert.IsTrue(_upper.Between(_lower, _upper, InclusiveOptions.UpperInclusive));
-        Assert.IsFalse(_upper.Between(_lower, _upper, InclusiveOptions.LowerInclusive));
+        Assert.That(_upper.Between(_lower, _upper, InclusiveOptions.Inclusive));
+        Assert.That(_upper.Between(_lower, _upper, InclusiveOptions.UpperInclusive));
+        Assert.That(_upper.Between(_lower, _upper, InclusiveOptions.LowerInclusive), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void Between_1_10_5_ShouldThrow()
     {
-        Assert.ThrowsException<ArgumentException>(() => _lower.Between(_upper, _value));
+        Assert.Throws<ArgumentException>(() => _lower.Between(_upper, _value));
     }
 
-    [TestMethod]
+    [Test]
     public void Between_Null_ShouldThrow()
     {
         ComparableTestClass? nullPointer = null;
-        Assert.ThrowsException<ArgumentNullException>(() => ((ComparableTestClass?)null)!.Between(nullPointer!, nullPointer!));
+        Assert.Throws<ArgumentNullException>(() => ((ComparableTestClass?)null)!.Between(nullPointer!, nullPointer!));
     }
 
-    [TestMethod]
+    [Test]
     public void Clamp_3_1_5_ShouldBe3()
     {
-        Assert.AreEqual(3, 3.Clamp(1, 5));
+        Assert.That(3.Clamp(1, 5), Is.EqualTo(3));
     }
 
-    [TestMethod]
+    [Test]
     public void Clamp_10_1_5_ShouldBe5()
     {
-        Assert.AreEqual(5, 10.Clamp(1, 5));
+        Assert.That(10.Clamp(1, 5), Is.EqualTo(5));
     }
 
-    [TestMethod]
+    [Test]
     public void Clamp_n_6_5_ShouldThrow()
     {
-        Assert.ThrowsException<ArgumentException>(() => 0.Clamp(6, 5));
+        Assert.Throws<ArgumentException>(() => 0.Clamp(6, 5));
     }
 
-    [TestMethod]
+    [Test]
     public void Clamp_ShouldThrowArgumentNullException_GivenNullValue()
     {
         string comparable = null!;
-        Assert.ThrowsException<ArgumentNullException>(() => comparable.Clamp(string.Empty, string.Empty));
+        Assert.Throws<ArgumentNullException>(() => comparable.Clamp(string.Empty, string.Empty));
     }
 
-    [TestMethod]
+    [Test]
     public void GreaterThan_5_6_ShouldBeFalse()
     {
-        Assert.IsFalse(5.GreaterThan(6));
+        Assert.That(5.GreaterThan(6), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void GreaterThan_6_5_ShouldBeTrue()
     {
-        Assert.IsTrue(6.GreaterThan(5));
+        Assert.That(6.GreaterThan(5));
     }
 
-    [TestMethod]
+    [Test]
     public void GreaterThan_5_5_ShouldBeFalse()
     {
-        Assert.IsFalse(5.LessThan(5));
+        Assert.That(5.LessThan(5), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void GreaterThan_Null_ShouldThrow()
     {
         ComparableTestClass? nullPointer = null;
-        Assert.ThrowsException<ArgumentNullException>(() => nullPointer!.GreaterThan(nullPointer!));
+        Assert.Throws<ArgumentNullException>(() => nullPointer!.GreaterThan(nullPointer!));
     }
 
-    [TestMethod]
+    [Test]
     public void GreaterThanOrEqualTo_5_5_ShouldBeTrue()
     {
-        Assert.IsTrue(5.GreaterThanOrEqualTo(5));
+        Assert.That(5.GreaterThanOrEqualTo(5));
     }
 
-    [TestMethod]
+    [Test]
     public void GreaterThanOrEqualTo_6_5_ShouldBeTrue()
     {
-        Assert.IsTrue(6.GreaterThanOrEqualTo(5));
+        Assert.That(6.GreaterThanOrEqualTo(5));
     }
 
-    [TestMethod]
+    [Test]
     public void GreaterThanOrEqualTo_5_6_ShouldBeFalse()
     {
-        Assert.IsFalse(5.GreaterThanOrEqualTo(6));
+        Assert.That(5.GreaterThanOrEqualTo(6), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void GreaterThanOrEqualTo_Null_ShouldThrow()
     {
         ComparableTestClass? nullPointer = null;
-        Assert.ThrowsException<ArgumentNullException>(() => nullPointer!.GreaterThanOrEqualTo(nullPointer!));
+        Assert.Throws<ArgumentNullException>(() => nullPointer!.GreaterThanOrEqualTo(nullPointer!));
     }
 
-    [TestMethod]
+    [Test]
     public void LessThan_Null_ShouldThrow()
     {
         ComparableTestClass? nullPointer = null;
-        Assert.ThrowsException<ArgumentNullException>(() => nullPointer!.LessThan(nullPointer!));
+        Assert.Throws<ArgumentNullException>(() => nullPointer!.LessThan(nullPointer!));
     }
 
-    [TestMethod]
+    [Test]
     public void LessThan_6_5_ShouldBeFalse()
     {
-        Assert.IsFalse(6.LessThan(5));
+        Assert.That(6.LessThan(5), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void LessThan_5_6_ShouldBeTrue()
     {
-        Assert.IsTrue(5.LessThan(6));
+        Assert.That(5.LessThan(6));
     }
 
-    [TestMethod]
+    [Test]
     public void LessThan_5_5_ShouldBeFalse()
     {
-        Assert.IsFalse(5.LessThan(5));
+        Assert.That(5.LessThan(5), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void LessThanOrEqualTo_5_5_ShouldBeTrue()
     {
-        Assert.IsTrue(5.LessThanOrEqualTo(5));
+        Assert.That(5.LessThanOrEqualTo(5));
     }
 
-    [TestMethod]
+    [Test]
     public void LessThanOrEqualTo_5_6_ShouldBeTrue()
     {
-        Assert.IsTrue(5.LessThanOrEqualTo(6));
+        Assert.That(5.LessThanOrEqualTo(6));
     }
 
-    [TestMethod]
+    [Test]
     public void LessThanOrEqualTo_6_5_ShouldBeFalse()
     {
-        Assert.IsFalse(6.LessThanOrEqualTo(5));
+        Assert.That(6.LessThanOrEqualTo(5), Is.False);
     }
 
-    [TestMethod]
+    [Test]
     public void LessThanOrEqualTo_Null_ShouldThrow()
     {
         ComparableTestClass? nullPointer = null;
-        Assert.ThrowsException<ArgumentNullException>(() => nullPointer!.LessThanOrEqualTo(nullPointer!));
+        Assert.Throws<ArgumentNullException>(() => nullPointer!.LessThanOrEqualTo(nullPointer!));
     }
 
-    [TestMethod]
+    [Test]
     public void Max_Null_ShouldThrow()
     {
         ComparableTestClass? nullPointer = null;
-        Assert.ThrowsException<ArgumentNullException>(() => nullPointer!.Max(nullPointer!));
+        Assert.Throws<ArgumentNullException>(() => nullPointer!.Max(nullPointer!));
     }
 
-    [TestMethod]
+    [Test]
     public void Min_Null_ShouldThrow()
     {
         ComparableTestClass? nullPointer = null;
-        Assert.ThrowsException<ArgumentNullException>(() => nullPointer!.Min(nullPointer!));
+        Assert.Throws<ArgumentNullException>(() => nullPointer!.Min(nullPointer!));
     }
 }

X10D.Tests/src/Math/DecimalTests.Wrap.cs

@@ -1,14 +1,14 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Math;
 
 namespace X10D.Tests.Math;
 
 public partial class DecimalTests
 {
-    [TestClass]
+    [TestFixture]
     public class WrapTests
     {
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnLow_WhenValueIsEqualToLow()
         {
             const decimal value = 10;
@@ -17,10 +17,10 @@ public partial class DecimalTests
 
             decimal result = value.Wrap(low, high);
 
-            Assert.AreEqual(low, result);
+            Assert.That(result, Is.EqualTo(low));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnHigh_WhenValueIsEqualToHigh()
         {
             const decimal value = 20;
@@ -29,10 +29,10 @@ public partial class DecimalTests
 
             decimal result = value.Wrap(low, high);
 
-            Assert.AreEqual(low, result);
+            Assert.That(result, Is.EqualTo(low));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsGreaterThanHigh()
         {
             const decimal value = 30;
@@ -41,10 +41,10 @@ public partial class DecimalTests
 
             decimal result = value.Wrap(low, high);
 
-            Assert.AreEqual(low, result);
+            Assert.That(result, Is.EqualTo(low));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsLessThanLow()
         {
             const decimal value = 5;
@@ -53,10 +53,10 @@ public partial class DecimalTests
 
             decimal result = value.Wrap(low, high);
 
-            Assert.AreEqual(15.0m, result);
+            Assert.That(result, Is.EqualTo(15.0m));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsInBetweenLowAndHigh()
         {
             const decimal value = 15;
@@ -65,10 +65,10 @@ public partial class DecimalTests
 
             decimal result = value.Wrap(low, high);
 
-            Assert.AreEqual(value, result);
+            Assert.That(result, Is.EqualTo(value));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnZero_WhenValueIsEqualToLength()
         {
             const decimal value = 10;
@@ -76,10 +76,10 @@ public partial class DecimalTests
 
             decimal result = value.Wrap(length);
 
-            Assert.AreEqual(0.0m, result);
+            Assert.That(result, Is.EqualTo(0.0m));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnValue_WhenValueIsLessThanLength()
         {
             const decimal value = 5;
@@ -87,10 +87,10 @@ public partial class DecimalTests
 
             decimal result = value.Wrap(length);
 
-            Assert.AreEqual(value, result);
+            Assert.That(result, Is.EqualTo(value));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsGreaterThanLength()
         {
             const decimal value = 15;
@@ -98,7 +98,7 @@ public partial class DecimalTests
 
             decimal result = value.Wrap(length);
 
-            Assert.AreEqual(5.0m, result);
+            Assert.That(result, Is.EqualTo(5.0m));
         }
     }
 }

X10D.Tests/src/Math/DecimalTests.cs

@@ -1,140 +1,173 @@
 using System.Numerics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Math;
 
 namespace X10D.Tests.Math;
 
-[TestClass]
+[TestFixture]
 public partial class DecimalTests
 {
-    [TestMethod]
+    [Test]
     public void ComplexSqrt_ShouldBeCorrect_GivenReal()
     {
-        Assert.AreEqual(0.0, 0.0m.ComplexSqrt());
-        Assert.AreEqual(1.4142135623730951, 2.0m.ComplexSqrt());
-        Assert.AreEqual(3.0, 9.0m.ComplexSqrt());
-        Assert.AreEqual(4.0, 16.0m.ComplexSqrt());
-        Assert.AreEqual(100.0, 10000.0m.ComplexSqrt());
+        Assert.Multiple(() =>
+        {
+            Assert.That(0.0m.ComplexSqrt(), Is.EqualTo((Complex)0.0));
+            Assert.That(2.0m.ComplexSqrt(), Is.EqualTo((Complex)1.4142135623730951));
+            Assert.That(9.0m.ComplexSqrt(), Is.EqualTo((Complex)3.0));
+            Assert.That(16.0m.ComplexSqrt(), Is.EqualTo((Complex)4.0));
+            Assert.That(10000.0m.ComplexSqrt(), Is.EqualTo((Complex)100.0));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ComplexSqrt_ShouldBeImaginary_GivenNegativeValue()
     {
-        Assert.AreEqual(new Complex(0, 1), (-1.0m).ComplexSqrt());
-        Assert.AreEqual(new Complex(0, 1.4142135623730951), (-2.0m).ComplexSqrt());
-        Assert.AreEqual(new Complex(0, 3.0), (-9.0m).ComplexSqrt());
-        Assert.AreEqual(new Complex(0, 4.0), (-16.0m).ComplexSqrt());
+        Assert.Multiple(() =>
+        {
+            Assert.That((-1.0m).ComplexSqrt(), Is.EqualTo(new Complex(0, 1)));
+            Assert.That((-2.0m).ComplexSqrt(), Is.EqualTo(new Complex(0, 1.4142135623730951)));
+            Assert.That((-9.0m).ComplexSqrt(), Is.EqualTo(new Complex(0, 3.0)));
+            Assert.That((-16.0m).ComplexSqrt(), Is.EqualTo(new Complex(0, 4.0)));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IsEven_ShouldBeFalse_GivenOddNumber()
     {
-        Assert.IsFalse((-3.0m).IsEven());
-        Assert.IsFalse((-1.0m).IsEven());
-        Assert.IsFalse(1.0m.IsEven());
-        Assert.IsFalse(3.0m.IsEven());
+        Assert.Multiple(() =>
+        {
+            Assert.That((-3.0m).IsEven(), Is.False);
+            Assert.That((-1.0m).IsEven(), Is.False);
+            Assert.That(1.0m.IsEven(), Is.False);
+            Assert.That(3.0m.IsEven(), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IsEven_ShouldBeTrue_GivenOddNumber()
     {
-        Assert.IsTrue((-4.0m).IsEven());
-        Assert.IsTrue((-2.0m).IsEven());
-        Assert.IsTrue(0.0m.IsEven());
-        Assert.IsTrue(2.0m.IsEven());
-        Assert.IsTrue(4.0m.IsEven());
+        Assert.Multiple(() =>
+        {
+            Assert.That((-4.0m).IsEven());
+            Assert.That((-2.0m).IsEven());
+            Assert.That(0.0m.IsEven());
+            Assert.That(2.0m.IsEven());
+            Assert.That(4.0m.IsEven());
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IsOdd_ShouldBeFalse_GivenEvenNumber()
     {
-        Assert.IsFalse((-4.0m).IsOdd());
-        Assert.IsFalse((-2.0m).IsOdd());
-        Assert.IsFalse(0.0m.IsOdd());
-        Assert.IsFalse(2.0m.IsOdd());
-        Assert.IsFalse(4.0m.IsOdd());
+        Assert.Multiple(() =>
+        {
+            Assert.That((-4.0m).IsOdd(), Is.False);
+            Assert.That((-2.0m).IsOdd(), Is.False);
+            Assert.That(0.0m.IsOdd(), Is.False);
+            Assert.That(2.0m.IsOdd(), Is.False);
+            Assert.That(4.0m.IsOdd(), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IsOdd_ShouldBeTrue_GivenOddNumber()
     {
-        Assert.IsTrue((-3.0m).IsOdd());
-        Assert.IsTrue((-1.0m).IsOdd());
-        Assert.IsTrue(1.0m.IsOdd());
-        Assert.IsTrue(3.0m.IsOdd());
+        Assert.Multiple(() =>
+        {
+            Assert.That((-3.0m).IsOdd());
+            Assert.That((-1.0m).IsOdd());
+            Assert.That(1.0m.IsOdd());
+            Assert.That(3.0m.IsOdd());
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Round_ShouldRoundToNearestInteger()
     {
-        Assert.AreEqual(4.0m, 3.5m.Round());
-        Assert.AreEqual(7.0m, 6.8m.Round());
-        Assert.AreEqual(7.0m, 7.2m.Round());
+        Assert.Multiple(() =>
+        {
+            Assert.That(3.5m.Round(), Is.EqualTo(4.0m));
+            Assert.That(6.8m.Round(), Is.EqualTo(7.0m));
+            Assert.That(7.2m.Round(), Is.EqualTo(7.0m));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Round_ShouldRoundToNearestMultiple()
     {
-        Assert.AreEqual(5.0m, 3.5m.Round(5));
-        Assert.AreEqual(5.0m, 7.0m.Round(5));
-        Assert.AreEqual(10.0m, 7.5m.Round(5));
+        Assert.Multiple(() =>
+        {
+            Assert.That(3.5m.Round(5), Is.EqualTo(5.0m));
+            Assert.That(7.0m.Round(5), Is.EqualTo(5.0m));
+            Assert.That(7.5m.Round(5), Is.EqualTo(10.0m));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Saturate_ShouldClampValueTo1_GivenGreaterThan1()
     {
-        Assert.AreEqual(1.0m, 1.5m.Saturate(), 1e-6m);
+        Assert.That(1.5m.Saturate(), Is.EqualTo(1.0m));
     }
 
-    [TestMethod]
+    [Test]
     public void Saturate_ShouldClampValueTo0_GivenLessThan0()
     {
-        Assert.AreEqual(0.0m, (-0.5m).Saturate(), 1e-6m);
+        Assert.That((-0.5m).Saturate(), Is.EqualTo(0.0m));
     }
 
-    [TestMethod]
+    [Test]
     public void Saturate_ShouldReturnValue_GivenValueBetween0And1()
     {
-        Assert.AreEqual(0.5m, 0.5m.Saturate(), 1e-6m);
+        Assert.That(0.5m.Saturate(), Is.EqualTo(0.5m));
     }
 
-    [TestMethod]
+    [Test]
     public void Sign_ShouldBeMinus1_GivenNegative()
     {
-        Assert.AreEqual(-1, -1.0m.Sign());
-        Assert.AreEqual(-1, -2.0m.Sign());
-        Assert.AreEqual(-1, -3.0m.Sign());
+        Assert.Multiple(() =>
+        {
+            Assert.That(-1.0m.Sign(), Is.EqualTo(-1));
+            Assert.That(-2.0m.Sign(), Is.EqualTo(-1));
+            Assert.That(-3.0m.Sign(), Is.EqualTo(-1));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Sign_ShouldBe0_Given0()
     {
-        Assert.AreEqual(0, 0.0m.Sign());
+        Assert.That(0.0m.Sign(), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Sign_ShouldBe1_GivenPositive()
     {
-        Assert.AreEqual(1, 1.0m.Sign());
-        Assert.AreEqual(1, 2.0m.Sign());
-        Assert.AreEqual(1, 3.0m.Sign());
+        Assert.Multiple(() =>
+        {
+            Assert.That(1.0m.Sign(), Is.EqualTo(1));
+            Assert.That(2.0m.Sign(), Is.EqualTo(1));
+            Assert.That(3.0m.Sign(), Is.EqualTo(1));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Sqrt_ShouldBeCorrect_GivenValue()
     {
-        Assert.AreEqual(0.0m, 0.0m.Sqrt());
-        Assert.AreEqual(1.4142135623730950488016887242m, 2.0m.Sqrt());
-        Assert.AreEqual(3.0m, 9.0m.Sqrt());
-        Assert.AreEqual(4.0m, 16.0m.Sqrt());
-        Assert.AreEqual(100.0m, 10000.0m.Sqrt());
+        Assert.Multiple(() =>
+        {
+            Assert.That(0.0m.Sqrt(), Is.EqualTo(0.0m));
+            Assert.That(2.0m.Sqrt(), Is.EqualTo(1.4142135623730950488016887242m));
+            Assert.That(9.0m.Sqrt(), Is.EqualTo(3.0m));
+            Assert.That(16.0m.Sqrt(), Is.EqualTo(4.0m));
+            Assert.That(10000.0m.Sqrt(), Is.EqualTo(100.0m));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Sqrt_ShouldThrow_GivenNegativeValue()
     {
-        Assert.ThrowsException<ArgumentException>(() => (-1.0m).Sqrt());
-        Assert.ThrowsException<ArgumentException>(() => (-2.0m).Sqrt());
-        Assert.ThrowsException<ArgumentException>(() => (-3.0m).Sqrt());
+        Assert.Throws<ArgumentException>(() => _ = (-1.0m).Sqrt());
+        Assert.Throws<ArgumentException>(() => _ = (-2.0m).Sqrt());
+        Assert.Throws<ArgumentException>(() => _ = (-3.0m).Sqrt());
     }
 }

X10D.Tests/src/Math/DoubleTests.Wrap.cs

@@ -1,14 +1,14 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Math;
 
 namespace X10D.Tests.Math;
 
 public partial class DoubleTests
 {
-    [TestClass]
+    [TestFixture]
     public class WrapTests
     {
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnLow_WhenValueIsEqualToLow()
         {
             const double value = 10;
@@ -17,10 +17,10 @@ public partial class DoubleTests
 
             double result = value.Wrap(low, high);
 
-            Assert.AreEqual(low, result);
+            Assert.That(result, Is.EqualTo(low));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnHigh_WhenValueIsEqualToHigh()
         {
             const double value = 20;
@@ -29,10 +29,10 @@ public partial class DoubleTests
 
             double result = value.Wrap(low, high);
 
-            Assert.AreEqual(low, result);
+            Assert.That(result, Is.EqualTo(low));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsGreaterThanHigh()
         {
             const double value = 30;
@@ -41,10 +41,10 @@ public partial class DoubleTests
 
             double result = value.Wrap(low, high);
 
-            Assert.AreEqual(low, result);
+            Assert.That(result, Is.EqualTo(low));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsLessThanLow()
         {
             const double value = 5;
@@ -53,10 +53,10 @@ public partial class DoubleTests
 
             double result = value.Wrap(low, high);
 
-            Assert.AreEqual(15.0, result);
+            Assert.That(result, Is.EqualTo(15.0));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsInBetweenLowAndHigh()
         {
             const double value = 15;
@@ -65,10 +65,10 @@ public partial class DoubleTests
 
             double result = value.Wrap(low, high);
 
-            Assert.AreEqual(value, result);
+            Assert.That(result, Is.EqualTo(value));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnZero_WhenValueIsEqualToLength()
         {
             const double value = 10;
@@ -76,10 +76,10 @@ public partial class DoubleTests
 
             double result = value.Wrap(length);
 
-            Assert.AreEqual(0.0, result);
+            Assert.That(result, Is.EqualTo(0.0));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnValue_WhenValueIsLessThanLength()
         {
             const double value = 5;
@@ -87,10 +87,10 @@ public partial class DoubleTests
 
             double result = value.Wrap(length);
 
-            Assert.AreEqual(value, result);
+            Assert.That(result, Is.EqualTo(value));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsGreaterThanLength()
         {
             const double value = 15;
@@ -98,7 +98,7 @@ public partial class DoubleTests
 
             double result = value.Wrap(length);
 
-            Assert.AreEqual(5.0, result);
+            Assert.That(result, Is.EqualTo(5.0));
         }
     }
 }

X10D.Tests/src/Math/DoubleTests.cs

@@ -1,260 +1,300 @@
 using System.Numerics;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Math;
 
 namespace X10D.Tests.Math;
 
-[TestClass]
+[TestFixture]
 public partial class DoubleTests
 {
-    [TestMethod]
+    [Test]
     public void DegreesToRadians_ShouldBeCorrect()
     {
-        Assert.AreEqual(System.Math.PI, 180.0.DegreesToRadians(), 1e-6);
-        Assert.AreEqual(System.Math.PI * 1.5, 270.0.DegreesToRadians(), 1e-6);
-        Assert.AreEqual(0.0, 0.0.DegreesToRadians(), 1e-6);
-        Assert.AreEqual(0.017453292519943295, 1.0.DegreesToRadians(), 1e-6);
-        Assert.AreEqual(0.10471975511965978, 6.0.DegreesToRadians(), 1e-6);
-        Assert.AreEqual(0.20943951023931956, 12.0.DegreesToRadians(), 1e-6);
+        Assert.Multiple(() =>
+        {
+            Assert.That(180.0.DegreesToRadians(), Is.EqualTo(System.Math.PI).Within(1e-6));
+            Assert.That(270.0.DegreesToRadians(), Is.EqualTo(System.Math.PI * 1.5).Within(1e-6));
+            Assert.That(0.0.DegreesToRadians(), Is.EqualTo(0.0).Within(1e-6));
+            Assert.That(1.0.DegreesToRadians(), Is.EqualTo(0.017453292519943295).Within(1e-6));
+            Assert.That(6.0.DegreesToRadians(), Is.EqualTo(0.10471975511965978).Within(1e-6));
+            Assert.That(12.0.DegreesToRadians(), Is.EqualTo(0.20943951023931956).Within(1e-6));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void RadiansToDegrees_ShouldBeCorrect()
     {
-        Assert.AreEqual(180.0, System.Math.PI.RadiansToDegrees(), 1e-6);
-        Assert.AreEqual(360.0, (2.0 * System.Math.PI).RadiansToDegrees(), 1e-6);
-        Assert.AreEqual(0.0, 0.0.RadiansToDegrees(), 1e-6);
-        Assert.AreEqual(1.0, 0.017453292519943295.RadiansToDegrees(), 1e-6);
-        Assert.AreEqual(6.000000000000001, 0.10471975511965978.RadiansToDegrees(), 1e-6); // rounding errors are fun
-        Assert.AreEqual(12.0, 0.20943951023931953.RadiansToDegrees(), 1e-6);
+        Assert.Multiple(() =>
+        {
+            Assert.That(System.Math.PI.RadiansToDegrees(), Is.EqualTo(180.0).Within(1e-6));
+            Assert.That((2.0 * System.Math.PI).RadiansToDegrees(), Is.EqualTo(360.0).Within(1e-6));
+            Assert.That(0.0.RadiansToDegrees(), Is.EqualTo(0.0).Within(1e-6));
+            Assert.That(0.017453292519943295.RadiansToDegrees(), Is.EqualTo(1.0).Within(1e-6));
+            // rounding errors are fun
+            Assert.That(0.10471975511965978.RadiansToDegrees(), Is.EqualTo(6.000000000000001).Within(1e-6));
+            Assert.That(0.20943951023931953.RadiansToDegrees(), Is.EqualTo(12.0).Within(1e-6));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ComplexSqrt_ShouldBeCorrect_GivenReal()
     {
-        Assert.AreEqual(0.0, 0.0.ComplexSqrt());
-        Assert.AreEqual(1.4142135623730951, 2.0.ComplexSqrt());
-        Assert.AreEqual(3.0, 9.0.ComplexSqrt());
-        Assert.AreEqual(4.0, 16.0.ComplexSqrt());
-        Assert.AreEqual(100.0, 10000.0.ComplexSqrt());
+        Assert.Multiple(() =>
+        {
+            Assert.That(0.0.ComplexSqrt(), Is.EqualTo((Complex)0.0));
+            Assert.That(2.0.ComplexSqrt(), Is.EqualTo((Complex)1.4142135623730951));
+            Assert.That(9.0.ComplexSqrt(), Is.EqualTo((Complex)3.0));
+            Assert.That(16.0.ComplexSqrt(), Is.EqualTo((Complex)4.0));
+            Assert.That(10000.0.ComplexSqrt(), Is.EqualTo((Complex)100.0));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ComplexSqrt_ShouldBeImaginary_GivenNegativeValue()
     {
-        Assert.AreEqual(new Complex(0, 1), (-1.0).ComplexSqrt());
-        Assert.AreEqual(new Complex(0, 1.4142135623730951), (-2.0).ComplexSqrt());
-        Assert.AreEqual(new Complex(0, 3.0), (-9.0).ComplexSqrt());
-        Assert.AreEqual(new Complex(0, 4.0), (-16.0).ComplexSqrt());
+        Assert.Multiple(() =>
+        {
+            Assert.That((-1.0).ComplexSqrt(), Is.EqualTo(new Complex(0, 1)));
+            Assert.That((-2.0).ComplexSqrt(), Is.EqualTo(new Complex(0, 1.4142135623730951)));
+            Assert.That((-9.0).ComplexSqrt(), Is.EqualTo(new Complex(0, 3.0)));
+            Assert.That((-16.0).ComplexSqrt(), Is.EqualTo(new Complex(0, 4.0)));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ComplexSqrt_ShouldBeComplexInfinity_GivenInfinity()
     {
-        Assert.AreEqual(Complex.Infinity, double.NegativeInfinity.ComplexSqrt());
-        Assert.AreEqual(Complex.Infinity, double.PositiveInfinity.ComplexSqrt());
+        Assert.Multiple(() =>
+        {
+            Assert.That(double.NegativeInfinity.ComplexSqrt(), Is.EqualTo(Complex.Infinity));
+            Assert.That(double.PositiveInfinity.ComplexSqrt(), Is.EqualTo(Complex.Infinity));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void ComplexSqrt_ShouldBeNaN_GivenNaN()
     {
-        Assert.AreEqual(Complex.NaN, double.NaN.ComplexSqrt());
+        Assert.That(double.NaN.ComplexSqrt(), Is.EqualTo(Complex.NaN));
     }
 
-    [TestMethod]
+    [Test]
     public void IsEven_ShouldBeFalse_GivenOddNumber()
     {
-        Assert.IsFalse((-3.0).IsEven());
-        Assert.IsFalse((-1.0).IsEven());
-        Assert.IsFalse(1.0.IsEven());
-        Assert.IsFalse(3.0.IsEven());
+        Assert.Multiple(() =>
+        {
+            Assert.That((-3.0).IsEven(), Is.False);
+            Assert.That((-1.0).IsEven(), Is.False);
+            Assert.That(1.0.IsEven(), Is.False);
+            Assert.That(3.0.IsEven(), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IsEven_ShouldBeTrue_GivenOddNumber()
     {
-        Assert.IsTrue((-4.0).IsEven());
-        Assert.IsTrue((-2.0).IsEven());
-        Assert.IsTrue(0.0.IsEven());
-        Assert.IsTrue(2.0.IsEven());
-        Assert.IsTrue(4.0.IsEven());
+        Assert.Multiple(() =>
+        {
+            Assert.That((-4.0).IsEven());
+            Assert.That((-2.0).IsEven());
+            Assert.That(0.0.IsEven());
+            Assert.That(2.0.IsEven());
+            Assert.That(4.0.IsEven());
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IsOdd_ShouldBeFalse_GivenEvenNumber()
     {
-        Assert.IsFalse((-4.0).IsOdd());
-        Assert.IsFalse((-2.0).IsOdd());
-        Assert.IsFalse(0.0.IsOdd());
-        Assert.IsFalse(2.0.IsOdd());
-        Assert.IsFalse(4.0.IsOdd());
+        Assert.Multiple(() =>
+        {
+            Assert.That((-4.0).IsOdd(), Is.False);
+            Assert.That((-2.0).IsOdd(), Is.False);
+            Assert.That(0.0.IsOdd(), Is.False);
+            Assert.That(2.0.IsOdd(), Is.False);
+            Assert.That(4.0.IsOdd(), Is.False);
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void IsOdd_ShouldBeTrue_GivenOddNumber()
     {
-        Assert.IsTrue((-3.0).IsOdd());
-        Assert.IsTrue((-1.0).IsOdd());
-        Assert.IsTrue(1.0.IsOdd());
-        Assert.IsTrue(3.0.IsOdd());
+        Assert.Multiple(() =>
+        {
+            Assert.That((-3.0).IsOdd());
+            Assert.That((-1.0).IsOdd());
+            Assert.That(1.0.IsOdd());
+            Assert.That(3.0.IsOdd());
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Round_ShouldRoundToNearestInteger()
     {
-        Assert.AreEqual(4.0, 3.5.Round(), 1e-6);
-        Assert.AreEqual(7.0, 6.8.Round(), 1e-6);
-        Assert.AreEqual(7.0, 7.2.Round(), 1e-6);
+        Assert.That(3.5.Round(), Is.EqualTo(4.0).Within(1e-6));
+        Assert.That(6.8.Round(), Is.EqualTo(7.0).Within(1e-6));
+        Assert.That(7.2.Round(), Is.EqualTo(7.0).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void Round_ShouldRoundToNearestMultiple()
     {
-        Assert.AreEqual(5.0, 3.5.Round(5), 1e-6);
-        Assert.AreEqual(5.0, 7.0.Round(5), 1e-6);
-        Assert.AreEqual(10.0, 7.5.Round(5), 1e-6);
+        Assert.That(3.5.Round(5), Is.EqualTo(5.0).Within(1e-6));
+        Assert.That(7.0.Round(5), Is.EqualTo(5.0).Within(1e-6));
+        Assert.That(7.5.Round(5), Is.EqualTo(10.0).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void Saturate_ShouldClampValueTo1_GivenGreaterThan1()
     {
-        Assert.AreEqual(1.0, 1.5.Saturate(), 1e-6);
+        Assert.That(1.5.Saturate(), Is.EqualTo(1.0).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void Saturate_ShouldClampValueTo0_GivenLessThan0()
     {
-        Assert.AreEqual(0.0, (-0.5).Saturate(), 1e-6);
+        Assert.That((-0.5).Saturate(), Is.EqualTo(0.0).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void Saturate_ShouldReturnValue_GivenValueBetween0And1()
     {
-        Assert.AreEqual(0.5, 0.5.Saturate(), 1e-6);
+        Assert.That(0.5.Saturate(), Is.EqualTo(0.5).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void Sign_ShouldBeMinus1_GivenNegative()
     {
-        Assert.AreEqual(-1, -1.0.Sign());
-        Assert.AreEqual(-1, -2.0.Sign());
-        Assert.AreEqual(-1, -3.0.Sign());
+        Assert.Multiple(() =>
+        {
+            Assert.That(-1.0.Sign(), Is.EqualTo(-1));
+            Assert.That(-2.0.Sign(), Is.EqualTo(-1));
+            Assert.That(-3.0.Sign(), Is.EqualTo(-1));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Sign_ShouldBe0_Given0()
     {
-        Assert.AreEqual(0, 0.0.Sign());
+        Assert.That(0.0.Sign(), Is.Zero);
     }
 
-    [TestMethod]
+    [Test]
     public void Sign_ShouldBe1_GivenPositive()
     {
-        Assert.AreEqual(1, 1.0.Sign());
-        Assert.AreEqual(1, 2.0.Sign());
-        Assert.AreEqual(1, 3.0.Sign());
+        Assert.Multiple(() =>
+        {
+            Assert.That(1.0.Sign(), Is.EqualTo(1));
+            Assert.That(2.0.Sign(), Is.EqualTo(1));
+            Assert.That(3.0.Sign(), Is.EqualTo(1));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Sqrt_ShouldBeCorrect_GivenValue()
     {
-        Assert.AreEqual(0.0, 0.0.Sqrt(), 1e-6);
-        Assert.AreEqual(1.414213562373095, 2.0.Sqrt(), 1e-6);
-        Assert.AreEqual(3.0, 9.0.Sqrt(), 1e-6);
-        Assert.AreEqual(4.0, 16.0.Sqrt(), 1e-6);
-        Assert.AreEqual(100.0, 10000.0.Sqrt(), 1e-6);
+        Assert.Multiple(() =>
+        {
+            Assert.That(0.0.Sqrt(), Is.EqualTo(0.0).Within(1e-6));
+            Assert.That(2.0.Sqrt(), Is.EqualTo(1.414213562373095).Within(1e-6));
+            Assert.That(9.0.Sqrt(), Is.EqualTo(3.0).Within(1e-6));
+            Assert.That(16.0.Sqrt(), Is.EqualTo(4.0).Within(1e-6));
+            Assert.That(10000.0.Sqrt(), Is.EqualTo(100.0).Within(1e-6));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Sqrt_ShouldBeNaN_GivenNaN()
     {
-        Assert.AreEqual(double.NaN, double.NaN.Sqrt());
+        Assert.That(double.NaN.Sqrt(), Is.EqualTo(double.NaN));
     }
 
-    [TestMethod]
+    [Test]
     public void Sqrt_ShouldBeNaN_GivenNegativeValue()
     {
-        Assert.AreEqual(double.NaN, (-1.0).Sqrt());
-        Assert.AreEqual(double.NaN, (-2.0).Sqrt());
-        Assert.AreEqual(double.NaN, (-3.0).Sqrt());
-        Assert.AreEqual(double.NaN, double.NegativeInfinity.Sqrt());
+        Assert.Multiple(() =>
+        {
+            Assert.That((-1.0).Sqrt(), Is.EqualTo(double.NaN));
+            Assert.That((-2.0).Sqrt(), Is.EqualTo(double.NaN));
+            Assert.That((-3.0).Sqrt(), Is.EqualTo(double.NaN));
+            Assert.That(double.NegativeInfinity.Sqrt(), Is.EqualTo(double.NaN));
+        });
     }
 
-    [TestMethod]
+    [Test]
     public void Sqrt_ShouldBePositiveInfinity_GivenPositiveInfinity()
     {
-        Assert.AreEqual(double.PositiveInfinity, double.PositiveInfinity.Sqrt());
+        Assert.That(double.PositiveInfinity.Sqrt(), Is.EqualTo(double.PositiveInfinity));
     }
 
-    [TestMethod]
+    [Test]
     public void Acos_ShouldBeCorrect()
     {
-        Assert.AreEqual(1.0471975511965979, 0.5.Acos(), 1e-6);
+        Assert.That(0.5.Acos(), Is.EqualTo(1.0471975511965979).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void Acosh_ShouldBeCorrect()
     {
-        Assert.AreEqual(0.9624236501192069, 1.5.Acosh(), 1e-6);
+        Assert.That(1.5.Acosh(), Is.EqualTo(0.9624236501192069).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void Asin_ShouldBeCorrect()
     {
-        Assert.AreEqual(0.5235987755982989, 0.5.Asin(), 1e-6);
+        Assert.That(0.5.Asin(), Is.EqualTo(0.5235987755982989).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void Asinh_ShouldBeCorrect()
     {
-        Assert.AreEqual(1.1947632172871094, 1.5.Asinh(), 1e-6);
+        Assert.That(1.5.Asinh(), Is.EqualTo(1.1947632172871094).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void Atan_ShouldBeCorrect()
     {
-        Assert.AreEqual(0.4636476090008061, 0.5.Atan(), 1e-6);
+        Assert.That(0.5.Atan(), Is.EqualTo(0.4636476090008061).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void Atanh_ShouldBeCorrect()
     {
-        Assert.AreEqual(0.5493061443340549, 0.5.Atanh(), 1e-6);
+        Assert.That(0.5.Atanh(), Is.EqualTo(0.5493061443340549).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void Cos_ShouldBeCorrect()
     {
-        Assert.AreEqual(0.8775825618903728, 0.5.Cos(), 1e-6);
+        Assert.That(0.5.Cos(), Is.EqualTo(0.8775825618903728).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void Cosh_ShouldBeCorrect()
     {
-        Assert.AreEqual(2.352409615243247, 1.5.Cosh(), 1e-6);
+        Assert.That(1.5.Cosh(), Is.EqualTo(2.352409615243247).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void Sin_ShouldBeCorrect()
     {
-        Assert.AreEqual(0.479425538604203, 0.5.Sin(), 1e-6);
+        Assert.That(0.5.Sin(), Is.EqualTo(0.479425538604203).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void Sinh_ShouldBeCorrect()
     {
-        Assert.AreEqual(2.1292794550948173, 1.5.Sinh(), 1e-6);
+        Assert.That(1.5.Sinh(), Is.EqualTo(2.1292794550948173).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void Tan_ShouldBeCorrect()
     {
-        Assert.AreEqual(0.5463024898437905, 0.5.Tan(), 1e-6);
+        Assert.That(0.5.Tan(), Is.EqualTo(0.5463024898437905).Within(1e-6));
     }
 
-    [TestMethod]
+    [Test]
     public void Tanh_ShouldBeCorrect()
     {
-        Assert.AreEqual(0.46211715726000974, 0.5.Tanh(), 1e-6);
+        Assert.That(0.5.Tanh(), Is.EqualTo(0.46211715726000974).Within(1e-6));
     }
 }

X10D.Tests/src/Math/Int16Tests.Wrap.cs

@@ -1,14 +1,14 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NUnit.Framework;
 using X10D.Math;
 
 namespace X10D.Tests.Math;
 
 public partial class Int16Tests
 {
-    [TestClass]
+    [TestFixture]
     public class WrapTests
     {
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnLow_WhenValueIsEqualToLow()
         {
             const short value = 10;
@@ -17,10 +17,10 @@ public partial class Int16Tests
 
             short result = value.Wrap(low, high);
 
-            Assert.AreEqual(low, result);
+            Assert.That(result, Is.EqualTo(low));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnHigh_WhenValueIsEqualToHigh()
         {
             const short value = 20;
@@ -29,10 +29,10 @@ public partial class Int16Tests
 
             short result = value.Wrap(low, high);
 
-            Assert.AreEqual(low, result);
+            Assert.That(result, Is.EqualTo(low));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsGreaterThanHigh()
         {
             const short value = 30;
@@ -41,10 +41,10 @@ public partial class Int16Tests
 
             short result = value.Wrap(low, high);
 
-            Assert.AreEqual(low, result);
+            Assert.That(result, Is.EqualTo(low));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsLessThanLow()
         {
             const short value = 5;
@@ -53,10 +53,10 @@ public partial class Int16Tests
 
             short result = value.Wrap(low, high);
 
-            Assert.AreEqual(15, result);
+            Assert.That(result, Is.EqualTo(15));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsInBetweenLowAndHigh()
         {
             const short value = 15;
@@ -65,10 +65,10 @@ public partial class Int16Tests
 
             short result = value.Wrap(low, high);
 
-            Assert.AreEqual(value, result);
+            Assert.That(result, Is.EqualTo(value));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnZero_WhenValueIsEqualToLength()
         {
             const short value = 10;
@@ -76,10 +76,10 @@ public partial class Int16Tests
 
             short result = value.Wrap(length);
 
-            Assert.AreEqual(0, result);
+            Assert.That(result, Is.Zero);
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnValue_WhenValueIsLessThanLength()
         {
             const short value = 5;
@@ -87,10 +87,10 @@ public partial class Int16Tests
 
             short result = value.Wrap(length);
 
-            Assert.AreEqual(value, result);
+            Assert.That(result, Is.EqualTo(value));
         }
 
-        [TestMethod]
+        [Test]
         public void Wrap_ShouldReturnCorrectResult_WhenValueIsGreaterThanLength()
         {
             const short value = 15;
@@ -98,7 +98,7 @@ public partial class Int16Tests
 
             short result = value.Wrap(length);
 
-            Assert.AreEqual(5, result);
+            Assert.That(result, Is.EqualTo(5));
         }
     }
 }