public void When_Deleting_From_Collection_Should_Be_Added_To_DeletedItems()
{
var orders = Helper.GetOrdersIList();
var trackable = orders.AsTrackable();
var first = trackable.First();
trackable.Remove(first);
trackable.CastToIChangeTrackableCollection().DeletedItems.Should().HaveCount(1)
.And.OnlyContain(o => o.Id == first.Id && o.CustomerNumber == first.CustomerNumber);
}