public void Subscription_Create_WithCouponAfterSignup()
{
// Arrange
var product = Chargify.GetProductList().Values.FirstOrDefault();
var newCustomer = new CustomerAttributes("Scott", "Pilgrim", "*****@*****.**", "Chargify", Guid.NewGuid().ToString());
var newPaymentInfo = GetTestPaymentMethod(newCustomer);
const string couponCode = "68C8FDBA";
// Act
var createdSubscription = Chargify.CreateSubscription(product.Handle, newCustomer, newPaymentInfo);
// Assert
Assert.IsNotNull(createdSubscription);
Assert.IsInstanceOfType(createdSubscription, typeof(Subscription));
Assert.IsTrue(createdSubscription.CouponCode == string.Empty);
// Act Again
var updatedSubscription = Chargify.AddCoupon(createdSubscription.SubscriptionID, couponCode);
// Assert Again
Assert.IsNotNull(updatedSubscription);
Assert.IsInstanceOfType(updatedSubscription, typeof(ISubscription));
Assert.IsTrue(updatedSubscription.CouponCode == couponCode);
}