restriction-service-worker-postmessage.https.html

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This WPT test may be referenced by the following Test IDs:
- /speculation-rules/prerender/restriction-service-worker-postmessage.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>postMessage() between service worker and prerendered page</title>

<meta name="timeout" content="long">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.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>

<body>

<script>

setup(() => assertSpeculationRulesIsSupported());

const uid = token();

const PAGE_URL = `resources/postmessage-to-service-worker.html?uid=${uid}`;

const WORKER_URL = 'resources/postmessage-to-client-worker.js';

// Message sequence: prerendered page => service worker => prerendered page =>

// main page

promise_test(async t => {

  const registration =

    await service_worker_unregister_and_register(t, WORKER_URL, PAGE_URL);

  t.add_cleanup(() => registration.unregister());

  await wait_for_state(t, registration.installing, 'activated');

  const bc = new PrerenderChannel('test-channel', uid);

  t.add_cleanup(_ => bc.close());

  const gotMessage = new Promise(resolve => {

    bc.addEventListener('message', e => {

      resolve(e.data);

    }, {

      once: true

});

});

  window.open(PAGE_URL, '_blank', 'noopener');

  const result = await gotMessage;

  const expected = [

    {event: 'started waiting ServiceWorker.postMessage',  prerendering: true},

    {event: 'prerendering change',                        prerendering: false},

    {event: 'postmessage to client',                      prerendering: false},

    {event: 'finished waiting ServiceWorker.postMessage', 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,

      `prerendering[${i}]`);

  // Send a close signal to PrerenderEventCollector on the prerendered page.

  new PrerenderChannel('close', uid).postMessage('');

}, 'ServiceWorker#postMessage() from a prerendered page should be deferred ' +

   'until page activation.');

</script>