public void AddOrderItemsInItemsProperty()
        {
            var order   = new Order();
            var curItem = new OrderTests();

            order.Add(curItem);
            Assert.Contains(curItem, order.Items);
        }
        public void RemoverOrderItemIsActuallyRemoved()
        {
            var order   = new Order();
            var curItem = new OrderTests();

            order.Add(curItem);
            order.Remove(curItem);
            Assert.DoesNotContain(curItem, order.Items);
        }