public sealed class FilePath : IEquatable<FilePath>
{
    private readonly string Path;
    // Equals(object), Equals(FilePath), GetHashCode, == and != are properly overloaded
}

    [Test]
    public async Task MinimalExampleTest()
    {
        var openedFile = new FilePath(@"D:\test_a.tmp");        
        var createdFile = new FilePath(@"D:\test_c.tmp");
        FilePath[] actual = [openedFile, createdFile];
        FilePath[] expected = [openedFile, createdFile];

        await Assert.That(actual).IsEquivalentTo(expected, CollectionOrdering.Any);
    }

Message: 
[Test Failure] Specified method is not supported.

  Stack Trace: 
RuntimeMethodInfo.ThrowNoInvokeException()
RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
PropertyInfo.GetValue(Object obj)
ReflectionHelper.GetMemberValue(Object obj, MemberInfo member)
StructuralEqualityComparer`1.CompareStructurally(Object x, Object y, HashSet`1 visited)
StructuralEqualityComparer`1.Equals(T x, T y)
CollectionEquivalencyChecker.CheckUnorderedEquivalenceLinear[TItem](List`1 actualList, List`1 expectedList, IEqualityComparer`1 comparer)
CollectionEquivalencyChecker.CheckUnorderedEquivalence[TItem](List`1 actualList, List`1 expectedList, IEqualityComparer`1 comparer)
CollectionEquivalencyChecker.AreEquivalent[TItem](IEnumerable`1 actual, IEnumerable`1 expected, CollectionOrdering ordering, IEqualityComparer`1 comparer)
IsEquivalentToAssertion`2.CheckAsync(EvaluationMetadata`1 metadata)
Assertion`1.CreateMetadataAndCheckAsync(TValue value, Exception exception)
Assertion`1.ExecuteCoreAsync()
Assertion`1.AssertAsync()