public void Order_Should_Update_Product_InTestorder_ToQuantity100() {
            Product p = _catalogService.GetProduct(1);
           
            Order order = new Order("testuser");

            order.AddItem(p, 1);
            order.AdjustQuantity(p, 100);
            _orderService.SaveItems(order);

            Assert.IsNotNull(order);
        }
        public void Order_Should_UpdateQuantity_Of_Product1_If_Added_Twice() {
            Product p = _catalogService.GetProduct(1);
           
            Order order = new Order("testuser");
            order.AddItem(p, 1);
            order.AddItem(p, 1);

            _orderService.SaveItems(order);

            Assert.AreEqual(1, order.Items.Count);
            Assert.AreEqual(2, order.Items[0].Quantity);
        }