public void should_return_duplicates_of_order_descending()
{
var duplicates = CreateEntitiesList().Duplicates(x => x.Email, x => x.Age, Order.Descending).ToList();
duplicates.Count.ShouldEqual(2);
var result = duplicates.FirstOrDefault(x => x.Email == "[email protected]");
result.ShouldNotBeNull();
result.Age.ShouldEqual(33);
result = duplicates.FirstOrDefault(x => x.Email == "[email protected]");
result.Age.ShouldEqual(55);
}