public void Calculate_Cart_Total()
        {
            // Arrange
            Product p1 = new Product { ProductID = 1, Name = "P1", Price = 100M };
            Product p2 = new Product { ProductID = 2, Name = "P2", Price = 50M };
            Cart target = new Cart();

            // Act
            target.AddItem(p1, 1);
            target.AddItem(p2, 1);
            target.AddItem(p1, 3);
            decimal result = target.ComputeTotalValue();

            // Assert
            Assert.AreEqual(result, 450M);
        }
        //private Cart GetCart()
        //{
        //    Cart cart = (Cart)Session["Cart"];
        //    if (cart == null)
        //    {
        //        cart = new Cart();
        //        Session["Cart"] = cart;
        //    }
        //    return cart;
        //}
        public RedirectToRouteResult AddToCart(Cart cart, int productId, string returnUrl)
        {
            Product product = repository.Products.FirstOrDefault(p => p.ProductID == productId);

            if (product != null)
            {
                cart.AddItem(product, 1);
            }

            return RedirectToAction("Index", new { returnUrl });
        }
        public void Cannot_Checkout_Invalid_ShippingDetails()
        {
            // Arrange
            Mock<IOrderProcessor> mock = new Mock<IOrderProcessor>();
            Cart cart = new Cart();
            cart.AddItem(new Product(), 1);
            CartController target = new CartController(null, mock.Object);
            target.ModelState.AddModelError("error", "error");

            // Act
            ViewResult result = target.Checkout(cart, new ShippingDetails());

            // Assert
            mock.Verify(m => m.ProcessOrder(It.IsAny<Cart>(), It.IsAny<ShippingDetails>()), Times.Never());
            Assert.AreEqual("", result.ViewName);
            Assert.AreEqual(false, result.ViewData.ModelState.IsValid);
        }
        public void Can_Remove_Line()
        {
            // Arrange
            Product p1 = new Product { ProductID = 1, Name = "P1" };
            Product p2 = new Product { ProductID = 2, Name = "P2" };
            Product p3 = new Product { ProductID = 3, Name = "P3" };
            Cart target = new Cart();
            target.AddItem(p1, 1);
            target.AddItem(p2, 3);
            target.AddItem(p3, 5);
            target.AddItem(p2, 1);

            // Act
            target.RemoveLine(p2);

            // Assert
            Assert.AreEqual(target.Lines.Where(c => c.Product == p2).Count(), 0);
            Assert.AreEqual(target.Lines.Count(), 2);
        }
        public void Can_Clear_Contents()
        {
            // Arrange
            Product p1 = new Product { ProductID = 1, Name = "P1", Price = 100M };
            Product p2 = new Product { ProductID = 2, Name = "P2", Price = 50M };
            Cart target = new Cart();
            target.AddItem(p1, 1);
            target.AddItem(p2, 1);

            // Act
            target.Clear();

            // Assert
            Assert.AreEqual(target.Lines.Count(), 0);
        }
        public void Can_Checkout_And_Submit_Order()
        {
            // Arrange
            Mock<IOrderProcessor> mock = new Mock<IOrderProcessor>();
            Cart cart = new Cart();
            cart.AddItem(new Product(), 1);
            CartController target = new CartController(null, mock.Object);

            // Act
            ViewResult result = target.Checkout(cart, new ShippingDetails());
            mock.Verify(m => m.ProcessOrder(It.IsAny<Cart>(), It.IsAny<ShippingDetails>()), Times.Once());
            Assert.AreEqual("Completed", result.ViewName);
            Assert.AreEqual(true, result.ViewData.ModelState.IsValid);
        }
        public void Can_Add_Quantity_For_Existing_Lines()
        {
            // Arrange
            Product p1 = new Product { ProductID = 1, Name = "P1" };
            Product p2 = new Product { ProductID = 2, Name = "P2" };
            Cart target = new Cart();

            // Act
            target.AddItem(p1, 1);
            target.AddItem(p2, 1);
            target.AddItem(p1, 10);
            CartLine[] results = target.Lines.OrderBy(c => c.Product.ProductID).ToArray();

            // Assert
            Assert.AreEqual(results.Length, 2);
            Assert.AreEqual(results[0].Quantity, 11);
            Assert.AreEqual(results[1].Quantity, 1);
        }
        public void Can_Add_New_Lines()
        {
            Product p1 = new Product { ProductID = 1, Name = "P1" };
            Product p2 = new Product { ProductID = 2, Name = "P2" };

            // Arrange
            Cart target = new Cart();

            // Act
            target.AddItem(p1, 1);
            target.AddItem(p2, 1);
            CartLine[] results = target.Lines.ToArray();

            // Assert
            Assert.AreEqual(results.Length, 2);
            Assert.AreEqual(results[0].Product, p1);
            Assert.AreEqual(results[1].Product, p2);
        }