Add tests for NextUnitVector2/3 and NextRotation(Uniform)

X10D.Tests/src/Numerics/RandomTests.cs

@@ -0,0 +1,68 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using X10D.Numerics;
+
+namespace X10D.Tests.Numerics;
+
+[TestClass]
+public class RandomTests
+{
+    [TestMethod]
+    public void NextUnitVector2_ShouldReturnVector_WithMagnitude1()
+    {
+        var random = new Random();
+        var vector = random.NextUnitVector2();
+        Assert.AreEqual(1, vector.Length(), 1e-6);
+    }
+
+    [TestMethod]
+    public void NextUnitVector2_ShouldThrow_GivenNullRandom()
+    {
+        Random? random = null;
+        Assert.ThrowsException<ArgumentNullException>(() => random!.NextUnitVector2());
+    }
+
+    [TestMethod]
+    public void NextUnitVector3_ShouldReturnVector_WithMagnitude1()
+    {
+        var random = new Random();
+        var vector = random.NextUnitVector3();
+        Assert.AreEqual(1, vector.Length(), 1e-6);
+    }
+
+    [TestMethod]
+    public void NextUnitVector3_ShouldThrow_GivenNullRandom()
+    {
+        Random? random = null;
+        Assert.ThrowsException<ArgumentNullException>(() => random!.NextUnitVector3());
+    }
+
+    [TestMethod]
+    public void NextRotation_ShouldReturnQuaternion_WithMagnitude1()
+    {
+        var random = new Random();
+        var rotation = random.NextRotation();
+        Assert.AreEqual(1, rotation.Length(), 1e-6);
+    }
+
+    [TestMethod]
+    public void NextRotation_ShouldThrow_GivenNullRandom()
+    {
+        Random? random = null;
+        Assert.ThrowsException<ArgumentNullException>(() => random!.NextRotation());
+    }
+
+    [TestMethod]
+    public void NextRotationUniform_ShouldReturnQuaternion_WithMagnitude1()
+    {
+        var random = new Random();
+        var rotation = random.NextRotationUniform();
+        Assert.AreEqual(1, rotation.Length(), 1e-6);
+    }
+
+    [TestMethod]
+    public void NextRotationUniform_ShouldThrow_GivenNullRandom()
+    {
+        Random? random = null;
+        Assert.ThrowsException<ArgumentNullException>(() => random!.NextRotationUniform());
+    }
+}