I'm new to TDD and xUnit so I want to test my method that looks something like:
List<T> DeleteElements<T>(this List<T> a, List<T> b);
Is there any Assert method that I can use ? I think something like this would be nice
List<int> values = new List<int>() { 1, 2, 3 };
List<int> expected = new List<int>() { 1 };
List<int> actual = values.DeleteElements(new List<int>() { 2, 3 });
Assert.Exact(expected, actual);
Is there something like this ?
I recommend using FluentAssertions. It has a vast IntelliSense-friendly assertion library for many use cases including collections
collection.Should().Equal(1, 2, 5, 8);
collection.Should().NotEqual(8, 2, 3, 5);
collection.Should().BeEquivalentTo(8, 2, 1, 5);
xUnit.Net recognizes collections so you just need to do
Assert.Equal(expected, actual); // Order is important
You can see other available collection assertions in CollectionAsserts.cs
For NUnit library collection comparison methods are
CollectionAssert.AreEqual(IEnumerable, IEnumerable) // For sequences, order matters
and
CollectionAssert.AreEquivalent(IEnumerable, IEnumerable) // For sets, order doesn't matter
More details here: CollectionAssert
MbUnit also has collection assertions similar to NUnit: Assert.Collections.cs
In the current version of XUnit (1.5) you can just use
Assert.Equal(expected, actual);
The above method will do an element by element comparison of the two lists. I'm not sure if this works for any prior version.
Recently, I was using xUnit 2.4.0 and Moq 4.10.1 packages in my asp.net core 2.2 app.
In my case I managed to get it work with two steps process:
Defining an implementation of IEqualityComparer<T>
Pass the comparer instance as a third parameter into Assert.True method:
Assert.True(expected, actual, new MyEqualityComparer());
But there is another nicer way to get the same result using FluentAssertions package. It allows you to do the following:
// Assert
expected.Should().BeEquivalentTo(actual));
Interestingly that Assert.Equal() always fails even when I ordered the elements of two lists to get them in the same order.