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test: 100% coverage on EnumerableExtensions
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@ -13,6 +13,11 @@ public class EnumerableTests
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(int minimum, int maximum) = source.MinMax();
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Assert.AreEqual(1, minimum);
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Assert.AreEqual(10, maximum);
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source = Enumerable.Range(1, 10).ToArray();
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(minimum, maximum) = source.MinMax();
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Assert.AreEqual(1, minimum);
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Assert.AreEqual(10, maximum);
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}
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[TestMethod]
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@ -22,6 +27,11 @@ public class EnumerableTests
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(int minimum, int maximum) = source.MinMax(p => p.Age);
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Assert.AreEqual(1, minimum);
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Assert.AreEqual(10, maximum);
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source = Enumerable.Range(1, 10).Select(i => new Person {Age = i}).ToArray();
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(minimum, maximum) = source.MinMax(p => p.Age);
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Assert.AreEqual(1, minimum);
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Assert.AreEqual(10, maximum);
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}
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[TestMethod]
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@ -31,13 +41,21 @@ public class EnumerableTests
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(int minimum, int maximum) = source.MinMax(p => p.Age, new InverseComparer<int>());
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Assert.AreEqual(10, minimum);
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Assert.AreEqual(1, maximum);
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source = Enumerable.Range(1, 10).Select(i => new Person {Age = i}).ToArray();
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(minimum, maximum) = source.MinMax(p => p.Age, new InverseComparer<int>());
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Assert.AreEqual(10, minimum);
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Assert.AreEqual(1, maximum);
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}
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[TestMethod]
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public void MinMax_ShouldReturnOppositeValues_UsingInverseComparer()
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{
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IEnumerable<int> source = Enumerable.Range(1, 10);
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(int minimum, int maximum) = source.MinMax(new InverseComparer<int>());
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(int minimum, int maximum) = Enumerable.Range(1, 10).MinMax(new InverseComparer<int>());
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Assert.AreEqual(10, minimum);
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Assert.AreEqual(1, maximum);
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(minimum, maximum) = Enumerable.Range(1, 10).ToArray().MinMax(new InverseComparer<int>());
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Assert.AreEqual(10, minimum);
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Assert.AreEqual(1, maximum);
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}
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@ -45,8 +63,8 @@ public class EnumerableTests
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[TestMethod]
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public void MinMax_ShouldThrowArgumentNullException_GivenNullSelector()
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{
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IEnumerable<int> source = Enumerable.Range(1, 10);
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Assert.ThrowsException<ArgumentNullException>(() => source.MinMax((Func<int, int>?)null!));
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Assert.ThrowsException<ArgumentNullException>(() => Enumerable.Range(1, 10).MinMax((Func<int, int>?)null!));
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Assert.ThrowsException<ArgumentNullException>(() => Enumerable.Range(1, 10).ToArray().MinMax((Func<int, int>?)null!));
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}
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[TestMethod]
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@ -59,8 +77,13 @@ public class EnumerableTests
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[TestMethod]
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public void MinMax_ShouldThrowInvalidOperationException_GivenEmptySource()
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{
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IEnumerable<int> source = ArraySegment<int>.Empty;
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Assert.ThrowsException<InvalidOperationException>(() => source.MinMax());
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Assert.ThrowsException<InvalidOperationException>(() => Enumerable.Empty<int>().MinMax());
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Assert.ThrowsException<InvalidOperationException>(() => Array.Empty<int>().MinMax());
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Assert.ThrowsException<InvalidOperationException>(() => new List<int>().MinMax());
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Assert.ThrowsException<InvalidOperationException>(() => Enumerable.Empty<int>().MinMax(i => i * 2));
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Assert.ThrowsException<InvalidOperationException>(() => Array.Empty<int>().MinMax(i => i * 2));
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Assert.ThrowsException<InvalidOperationException>(() => new List<int>().MinMax(i => i * 2));
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}
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[TestMethod]
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@ -70,6 +93,11 @@ public class EnumerableTests
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(Person minimum, Person maximum) = source.MinMaxBy(p => p.Age);
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Assert.AreEqual(1, minimum.Age);
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Assert.AreEqual(10, maximum.Age);
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source = Enumerable.Range(1, 10).Select(i => new Person {Age = i}).ToArray();
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(minimum, maximum) = source.MinMaxBy(p => p.Age);
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Assert.AreEqual(1, minimum.Age);
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Assert.AreEqual(10, maximum.Age);
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}
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[TestMethod]
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@ -79,13 +107,27 @@ public class EnumerableTests
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(Person minimum, Person maximum) = source.MinMaxBy(p => p.Age, new InverseComparer<int>());
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Assert.AreEqual(10, minimum.Age);
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Assert.AreEqual(1, maximum.Age);
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source = Enumerable.Range(1, 10).Select(i => new Person {Age = i}).ToArray();
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(minimum, maximum) = source.MinMaxBy(p => p.Age, new InverseComparer<int>());
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Assert.AreEqual(10, minimum.Age);
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Assert.AreEqual(1, maximum.Age);
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}
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[TestMethod]
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public void MinMaxBy_ShouldThrowArgumentNullException_GivenNullSelector()
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{
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Assert.ThrowsException<ArgumentNullException>(() =>
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{
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IEnumerable<Person> source = Enumerable.Range(1, 10).Select(i => new Person {Age = i});
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Assert.ThrowsException<ArgumentNullException>(() => source.MinMaxBy((Func<Person, int>?)null!));
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return source.MinMaxBy((Func<Person, int>?)null!);
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});
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Assert.ThrowsException<ArgumentNullException>(() =>
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{
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Person[] source = Enumerable.Range(1, 10).Select(i => new Person {Age = i}).ToArray();
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return source.MinMaxBy((Func<Person, int>?)null!);
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});
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}
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[TestMethod]
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@ -98,8 +140,17 @@ public class EnumerableTests
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[TestMethod]
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public void MinMaxBy_ShouldThrowInvalidOperationException_GivenEmptySource()
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{
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IEnumerable<Person> source = ArraySegment<Person>.Empty;
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Assert.ThrowsException<InvalidOperationException>(() => source.MinMaxBy(p => p.Age));
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Assert.ThrowsException<InvalidOperationException>(() =>
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{
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IEnumerable<Person> source = Enumerable.Empty<Person>();
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return source.MinMaxBy(p => p.Age);
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});
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Assert.ThrowsException<InvalidOperationException>(() =>
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{
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Person[] source = Array.Empty<Person>();
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return source.MinMaxBy(p => p.Age);
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});
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}
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private struct InverseComparer<T> : IComparer<T> where T : IComparable<T>
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