mozilla-release/testing/web-platform/tests/payment-request/payment-request-canmakepayment-method-protection.https.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>Tests for PaymentRequest.canMakePayment() method</title>
<link rel="help" href="https://w3c.github.io/browser-payment-api/#show-method">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src='/resources/testdriver-vendor.js'></script>
<script src="/resources/testdriver.js"></script>
<script>
const basicCard = Object.freeze({ supportedMethods: "basic-card" });
const applePay = Object.freeze({
  supportedMethods: "https://apple.com/apple-pay",
  data: {
    version: 3,
    merchantIdentifier: "merchant.com.example",
    countryCode: "US",
    merchantCapabilities: ["supports3DS"],
    supportedNetworks: ["visa"],
  }
});
const defaultMethods = Object.freeze([basicCard, applePay]);
const defaultDetails = Object.freeze({
  total: {
    label: "Total",
    amount: {
      currency: "USD",
      value: "1.00",
    },
  },
});

promise_test(async t => {
  // This test might never actually hit its assertion, but that's allowed.
  const request = new PaymentRequest(defaultMethods, defaultDetails);
  for (let i = 0; i < 1000; i++) {
    try {
      await request.canMakePayment();
    } catch (err) {
      assert_equals(
        err.name,
        "NotAllowedError",
        "if it throws, then it must be a NotAllowedError."
      );
      break;
    }
  }
  for (let i = 0; i < 1000; i++) {
    try {
      await new PaymentRequest(defaultMethods, defaultDetails).canMakePayment();
    } catch (err) {
      assert_equals(
        err.name,
        "NotAllowedError",
        "if it throws, then it must be a NotAllowedError."
      );
      break;
    }
  }
}, `Optionally, at the user agent's discretion, return a promise rejected with a "NotAllowedError" DOMException.`);
</script>

<small>
  If you find a buggy test, please <a href="https://github.com/web-platform-tests/wpt/issues">file a bug</a>
  and tag one of the <a href="https://github.com/web-platform-tests/wpt/blob/master/payment-request/META.yml">suggested reviewers</a>.
</small>