public void Order_PhysicalProduct_GeneratePackingSlip()
        {
            // Arrange
            var order = new PhysicalProductOrder("Physical Product");

            // Act

            var result = order.GenerateOrder();

            // Assert
            Assert.AreEqual("GenerateOrder: Packing slip for Physical Product is generated.", result);
        }
        static void Main(string[] args)
        {
            // Menu based selection
            Console.WriteLine("Select any number from 1-6 for the Payment type");
            Console.WriteLine("-----------------------------------------------");

            Console.WriteLine("1. Physical Product");
            Console.WriteLine("2. Book");
            Console.WriteLine("3. Add Membership");
            Console.WriteLine("4. Upgrade Membership");
            Console.WriteLine("5. Membership or Upgrade");
            Console.WriteLine("6. Learning to Ski");
            Console.WriteLine("7. Physical product Or Book");
            Console.WriteLine("-----------------------------------------------");

            var keyPressed = Console.ReadLine();

            // Create order object
            Order  order  = null;
            string result = string.Empty;

            switch (keyPressed)
            {
            case "1":
                order  = new PhysicalProductOrder("Physical Product");
                result = order.GenerateOrder();

                break;

            case "2":
                order = new BookOrder("Book");
                order.GenerateOrder();
                break;

            case "3":
                order = new AddMembershipOrder("Add Membership");
                order.GenerateOrder();
                break;

            case "4":
                order = new AddMembershipOrder("Upgrade Membership");
                order.GenerateOrder();
                break;

            case "5":
                order = new MembershipOrUpgradeOrder("Membership or Upgrade");
                order.GenerateOrder();
                break;

            case "6":
                order = new VideoAddingOrder("Learning to Ski");
                order.GenerateOrder();
                break;

            case "7":
                order = new PhysicalProductOrBookOrder("Physical product Or Book");
                order.GenerateOrder();
                break;

            default:
                Console.WriteLine("Wrong selection, select within range.");
                break;
            }
            Console.WriteLine(result);
            Console.WriteLine();


            Console.WriteLine("Press any key to close the console window.");
            Console.ReadLine();
        }