public void Adding_Product_To_Cart_Goes_To_Cart_Screen()
        {
            // Arrange
            Mock<IProductsRepository> mock = new Mock<IProductsRepository>();
            mock.Setup(m => m.Products).Returns(new Product[]
                {
                    new Product { ProductID = 1, Name = "P1", Category = "Apples"}
                }.AsQueryable());
            Cart cart = new Cart();
            CartController target = new CartController(mock.Object,null);

            // Act
            RedirectToRouteResult result = target.AddToCart(cart, 2, "myUrl");

            // Assert
            Assert.AreEqual(result.RouteValues["action"], "Index");
            Assert.AreEqual(result.RouteValues["returnUrl"], "myUrl");
        }
        public void Can_Add_To_Cart()
        {
            // Arrange
            Mock<IProductsRepository> mock = new Mock<IProductsRepository>();
            mock.Setup(m => m.Products).Returns(new Product[]
                {
                    new Product { ProductID = 1, Name = "P1", Category = "Apples"}
                }.AsQueryable());
            Cart cart = new Cart();
            CartController target = new CartController(mock.Object,null);

            // Act
            target.AddToCart(cart, 1, null);

            // Assert
            Assert.AreEqual(cart.Lines.Count(), 1);
            Assert.AreEqual(cart.Lines.ToArray()[0].Product.ProductID, 1);
        }