public void Test_payment_gateway() { var Order = new Order { Product = new Product { ProductId = "102", Price = 10m, ProductName = "Product_2", Quantity = 20 }, Quantity = 2, OrderId = 10, OrderNumber = "100P1" }; var placeOrder = _paymentGateway.ChargePayment("", 0); Assert.AreEqual(placeOrder, true); }