public void RejectChanges_On_Collection_Should_Move_DeletedItems_Back_To_Unchanged()
{
var orders = Helper.GetOrdersIList();
var trackable = orders.AsTrackable();
var first = orders.First();
trackable.Remove(first);
var intf = trackable.CastToIChangeTrackableCollection();
intf.RejectChanges();
trackable.Count.Should().Be(10);
intf.UnchangedItems.Count().Should().Be(10);
}