Manual Tests for PaymentResponse.retry() - Please run in order!

Click on each button in sequence from top to bottom without refreshing the page. Each button will bring up the Payment Request UI window.

When presented with the payment sheet, use any credit card select to "Pay" multiple times.

1. A completed payment request cannot be retried.
2. Calling retry() more than once yield a rejected promise, but the retryPromise resolves independently.
3. Calling complete() while a retry() is in progress results in an InvalidStateError.
4. Trying to abort() via PaymentRequest is not possible.
5. It's possible to retry() multiple times and eventually complete(). After complete(), however, retry() rejects with an InvalidStateError.

6. When shown the payment sheet, hit pay once, then abort retrying the payment.

   The user aborting retrying a payment causes the retryPromise to reject with AbortError. Aborting a payment is causes it complete.

7. When shown the payment sheet, hit pay once. Check payment sheet for error fields. Then hit escape or otherwise abort the payment.

   When retrying, the user is shown error fields to fix.

8. When shown the payment sheet, hit pay once. Then, change the shipping option. Select to pay again.

   When "abort the update" occurs because of an update error, the `retryPromise` is rejected and response.[[complete]] becomes true.

9. When shown the payment sheet, hit pay once. Then retry once.

   Calling retry() multiple times is always a new object.
10. Done!