ShouldBeEquivalentTo with Includes does not correctly compare Enums

[brentatkins]

When using Including to explicitly define which member to compare, equality operations on enums don't work as expected. It only seems to compare enum lengths, but not the items within the collection.

public class CustomType
{
    public string Name { get; set; }
}

public class ClassA
{
    public List<CustomType> ListOfCustomTypes { get; set; }
}

[Test]
public void FluentAssertionsEnumIncludes()
{
    var list1 = new List<CustomType>
    {
        new CustomType {Name = "A"}, new CustomType {Name = "B"}
    };
    var list2 = new List<CustomType>
    {
        new CustomType {Name = "C"}, new CustomType {Name = "D"}
    };

    var objectA = new ClassA { ListOfCustomTypes = list1 };
    var objectB = new ClassA { ListOfCustomTypes = list2 };

    //incorrectly passes when using Includes
    objectA.ShouldBeEquivalentTo(objectB, options => options.Including(x => x.ListOfCustomTypes));

    //fails without includes
    objectA.ShouldBeEquivalentTo(objectB);
}

[dennisdoomen]

I managed to reproduce it. Thanks for reporting it.

[dennisdoomen]

Found the cause. Somehow FA is trying to apply the .Including(x => x.ListOfCustomTypes) predicate on the CustomType as well. This obviously fails.

[brentatkins]

Great! I had a go at fixing it myself, but I struggled to find my way around the codebase. Thanks for looking into it.