Assert to compare two lists of objects C#

Question

I am currently trying to learn how to use unit testing, and I have created the actual list of 3 animal objects and the expected list of 3 animal objects. The question is how

Answer 1

I am of the opinion that implementing the IEqualityComparer (Equals() and GetHashCode()) for only testing purpose is a code smell. I would rather use the following assertion method, where you can freely define that on which properties you want to do the assertions:

public static void AssertListEquals(Action asserter, IEnumerable expected, IEnumerable actual)
{
    IList actualList = actual.ToList();
    IList expectedList = expected.ToList();

    Assert.True(
        actualList.Count == expectedList.Count,
        $"Lists have different sizes. Expected list: {expectedList.Count}, actual list: {actualList.Count}");

    for (var i = 0; i < expectedList.Count; i++)
    {
        try
        {
            asserter.Invoke(expectedList[i], actualList[i]);
        }
        catch (Exception e)
        {
            Assert.True(false, $"Assertion failed because: {e.Message}");
        }
    }
}

In action it would look like as follows:

    public void TestMethod()
    {
        //Arrange
        //...

        //Act
        //...

        //Assert
        AssertAnimals(expectedAnimals, actualAnimals);
    }

    private void AssertAnimals(IEnumerable expectedAnimals, IEnumerable actualAnimals)
    {
        ListAsserter.AssertListEquals(
            (e,a) => AssertAnimal(e,a),
            expectedAnimals,
            actualAnimals);
    }

    private void AssertAnimal(Animal expected, Animal actual)
    {
        Assert.Equal(expected.Name, actual.Name);
        Assert.Equal(expected.Weight, actual.Weight);
        //Additional properties to assert...
    }

I am using XUnit for the simple Assert.True(...) and Assert.Equals(), but you can use any other unit test library for that. Hope it helps someone! ;)