chromium/third_party/blink/web_tests/http/tests/payments/payment-request-app-store-billing-mandatory-total.html

<!doctype html>
<title>PaymentRequest: Tests for app-store billing when total is mandatory</title>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script src="../serviceworker/resources/test-helpers.js"></script>
<script>
test(() => {
  assert_false(internals.runtimeFlags.digitalGoodsEnabled);
}, "This test suite assumes that the runtime-enabled-flag DigitalGoods is disabled.");

const onlySupportAppStoreBillingMethod = [{supportedMethods: "https://play.google.com/billing"}];
const supportBothAppStoreBillingMethodAndNormalMethod = [{supportedMethods: "https://play.google.com/billing"},
      {supportedMethods: "https://maxpay.test/payment-request"}];

[null, {}, "omitted", undefined].forEach(total => {
  test(() => {
    let details = {id: "foo"};
    if (total !== "omitted") Object.assign(details, { total });
    try {
      new PaymentRequest(onlySupportAppStoreBillingMethod, details);
    } catch (err) {
      let expectedMessage;
      if (total === null) {
        expectedMessage = "Failed to construct 'PaymentRequest': Missing required member(s): amount, label.";
      } else if (["omitted", undefined].includes(total)) {
        expectedMessage = "Failed to construct 'PaymentRequest': required member total is undefined.";
      } else {
        expectedMessage = "Failed to construct 'PaymentRequest': required member amount is undefined.";
      }
      assert_equals(err.message, expectedMessage, `Error messages mismatch.`);
      return;
    }
    assert_unreached(`Expect an exception.`);
  }, `The total field is mandatory (not allowed to be ${JSON.stringify(total)}) when DigitalGoods is disabled.`)
});

[null, {}, "omitted", undefined].forEach(details => {
  test(() => {
    let details = {id: "foo"};
    try {
      if (details === "omitted") {
        new PaymentRequest(onlySupportAppStoreBillingMethod);
      } else {
        new PaymentRequest(onlySupportAppStoreBillingMethod, details);
      }
    } catch (err) {
      let expectedMessage = "Failed to construct 'PaymentRequest': required member total is undefined.";
      assert_equals(err.message, expectedMessage, `Error messages mismatch.`);
      return;
    }
    assert_unreached(`Expect an exception.`);
  }, `The details field is mandatory (not allowed to be ${JSON.stringify(details)}) when DigitalGoods is disabled.`)
});
</script>