postmessage-from-waiting-serviceworker.https.html

<!DOCTYPE html>
<title>Service Worker: postMessage from waiting serviceworker</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/get-host-info.sub.js"></script>
<script src="resources/test-helpers.sub.js"></script>
<script>

function echo(worker, data) {
  return new Promise(resolve => {
    navigator.serviceWorker.addEventListener('message', function onMsg(evt) {
      navigator.serviceWorker.removeEventListener('message', onMsg);
      resolve(evt);
    });
    worker.postMessage(data);
  });
}

promise_test(t => {
  let script = 'resources/echo-message-to-source-worker.js';
  let scope = 'resources/client-postmessage-from-wait-serviceworker';
  let registration;
  let frame;
  return service_worker_unregister_and_register(t, script, scope)
    .then(swr => {
      t.add_cleanup(() => service_worker_unregister(t, scope));

      registration = swr;
      return wait_for_state(t, registration.installing, 'activated');
    }).then(_ => {
      return with_iframe(scope);
    }).then(f => {
      frame = f;
      return navigator.serviceWorker.register(script + '?update', { scope: scope })
    }).then(swr => {
      assert_equals(swr, registration, 'should be same registration');
      return wait_for_state(t, registration.installing, 'installed');
    }).then(_ => {
      return echo(registration.waiting, 'waiting');
    }).then(evt => {
      assert_equals(evt.source, registration.waiting,
                    'message event source should be correct');
      return echo(registration.active, 'active');
    }).then(evt => {
      assert_equals(evt.source, registration.active,
                    'message event source should be correct');
      frame.remove();
    });
}, 'Client.postMessage() from waiting serviceworker.');
</script>
chromium/third_party/blink/web_tests/external/wpt/service-workers/service-worker/postmessage-from-waiting-serviceworker.https.html
