public void AddedIOrderItemsAppearInItemsProperty()
{
var order = new Order();
var item = new MocKOrderItem();
order.Add(item);
Assert.Contains(item, order.Items);
}
public void RemovedIOrderItemsDoesNotAppearInItemsProperty()
{
var order = new Order();
var item = new MocKOrderItem();
order.Add(item);
order.Remove(item);
Assert.DoesNotContain(item, order.Items);
}