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);
}