public void FindCartItemFalseTest()
        {
            var product = new ProductBuilder().Constructer(ProductName, Desc, Quantity, Price);
            var cart    = new CartBuilder().Constructer(CartName);

            cart = cart.AddToCart(product.Id, 1);

            Assert.False(cart.FindCartItem(new Guid()));
        }
        public void AddToCartTest()
        {
            var product = new ProductBuilder().Constructer(ProductName, Desc, Quantity, Price);
            var cart    = new CartBuilder().Constructer(CartName);

            cart = cart.AddToCart(product.Id, 1);
            Assert.Single(cart.Build().CartItems);
            Assert.IsType <CartItem>(cart.Build().CartItems.FirstOrDefault());
        }
        public void RemoveCartItemFalseTest()
        {
            var product = new ProductBuilder().Constructer(ProductName, Desc, Quantity, Price);
            var cart    = new CartBuilder().Constructer(CartName);

            cart = cart.AddToCart(product.Id, 1);
            CartItem item = cart.Build().CartItems.FirstOrDefault();

            Assert.Single(cart.Build().CartItems);
            Assert.True(cart.RemoveCartItem(new Guid()));
            Assert.Single(cart.Build().CartItems);
        }
        public void AccumulateCartItemQuantityTest()
        {
            var product = new ProductBuilder().Constructer(ProductName, Desc, Quantity, Price);
            var cart    = new CartBuilder().Constructer(CartName);

            cart = cart.AddToCart(product.Id, 1);
            CartItem item = cart.Build().CartItems.FirstOrDefault();

            cart = cart.AccumulateCartItemQuantity(item.Id, 2);

            Assert.Single(cart.Build().CartItems);
            Assert.Equal(3, cart.Build().CartItems.FirstOrDefault().Quantity);
        }