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Test Info:

<!DOCTYPE html>
<title>Access to the Push API is deferred</title>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/common/utils.js"></script>
<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
<script src="../resources/utils.js"></script>
<script src="resources/utils.js"></script>
setup(() => assertSpeculationRulesIsSupported());
promise_test(async t => {
const uid = token();
const bc = new PrerenderChannel('test-channel', uid);
t.add_cleanup(_ => bc.close());
const gotMessage = new Promise(resolve => {
bc.addEventListener('message', e => {
}, {
once: true
// We grant the permission here to make a more discerning test because
// pushManager.subscribe() waits until the permission is granted, which
// is deferred during prerendering so the test would trivially pass without
// the permission.
await test_driver.set_permission({ name: 'push', userVisibleOnly: true },
// Install the service worker first to test pushManager.subscribe in the
// prerendering page.
const scope = `resources/`;
const script = `resources/do-nothing-worker.js`;
const registration =
await service_worker_unregister_and_register(t, script, scope);
t.add_cleanup(() => registration.unregister());
await wait_for_state(t, registration.installing, 'activated');
const url = `resources/push.https.html?uid=${uid}`;, '_blank', 'noopener');
const result = await gotMessage;
const expected = [
{event: 'started waiting pushManager.subscribe', prerendering: true},
{event: 'prerendering change', prerendering: false},
{event: 'finished waiting pushManager.subscribe', prerendering: false},
assert_equals(result.length, expected.length);
for (let i = 0; i < result.length; i++) {
assert_equals(result[i].event, expected[i].event, `event[${i}]`);
assert_equals(result[i].prerendering, expected[i].prerendering,
// Send a close signal to PrerenderEventCollector on the prerendered page.
new PrerenderChannel('close', uid).postMessage('');
}, `The access to the Push API should be deferred until the prerendered page is