public void Cannot_Delete_Invalid_Products()
        {
            // Arrange - create the mock repository
            Mock<IProductRepository> mock = new Mock<IProductRepository>();
            mock.Setup(m => m.Products).Returns(new Product[] {
                new Product {ProductID = 1, Name = "P1"},
                new Product {ProductID = 2, Name = "P2"},
                new Product {ProductID = 3, Name = "P3"},
                }.AsQueryable());

            // Arrange - create the controller
            AdminController target = new AdminController(mock.Object);

            // Act - delete using an ID that doesn't exist
            target.Delete(100);

            // Assert - ensure that the repository delete method was
            // called with the correct Product
            mock.Verify(m => m.DeleteProduct(It.IsAny<Product>()), Times.Never());
        }
        public void Can_Delete_Valid_Products()
        {
            // Arrange - create a Product
            Product prod = new Product { ProductID = 2, Name = "Test" };

            // Arrange - create the mock repository
            Mock<IProductRepository> mock = new Mock<IProductRepository>();
            mock.Setup(m => m.Products).Returns(new Product[] {
                new Product {ProductID = 1, Name = "P1"},
                prod,
                new Product {ProductID = 3, Name = "P3"},
                }.AsQueryable());

            // Arrange - create the controller
            AdminController target = new AdminController(mock.Object);

            // Act - delete the product
            target.Delete(prod.ProductID);

            // Assert - ensure that the repository delete method was
            // called with the correct Product
            mock.Verify(m => m.DeleteProduct(prod));
        }