public void Confirm_Order() { ValuesController controller = new ValuesController(_shoppingService); var productToAdd = new Product() { ProductCode = "ABC123", Quantity = 2, UnitPrice = 1.99M }; IHttpActionResult result = controller.AddToCart("Tony Stark", productToAdd); productToAdd = new Product() { ProductCode = "QQ22", Quantity = 1, UnitPrice = 15.99M }; result = controller.AddToCart("Tony Stark", productToAdd); IHttpActionResult orderResult = controller.ConfirmOrder("Tony Stark"); Assert.IsInstanceOfType(orderResult, typeof(OkResult)); }