public void PostUrl()
{
CheckoutShoppingCartRequest Req;
// Sandbox.
Req = new CheckoutShoppingCartRequest
("123", "456", EnvironmentType.Sandbox, "USD", 0);
Assert.AreEqual("https://sandbox.google.com/checkout/api/checkout/v2/merchantCheckout/Merchant/123", Req.GetPostUrl());
Req = new CheckoutShoppingCartRequest
("123", "456", EnvironmentType.Production, "USD", 0);
Assert.AreEqual("https://checkout.google.com/api/checkout/v2/merchantCheckout/Merchant/123", Req.GetPostUrl());
Req = new CheckoutShoppingCartRequest
("123", "456", EnvironmentType.Sandbox, "USD", 0, true);
Assert.AreEqual("https://sandbox.google.com/checkout/api/checkout/v2/merchantCheckout/Donations/123", Req.GetPostUrl());
Req = new CheckoutShoppingCartRequest
("123", "456", EnvironmentType.Production, "USD", 0, true);
Assert.AreEqual("https://checkout.google.com/api/checkout/v2/merchantCheckout/Donations/123", Req.GetPostUrl());
}