FileSystemObserver.js

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'use strict';

// This script depends on the following scripts:

//    /fs/resources/messaging-helpers.js

//    /service-worker/resources/test-helpers.sub.js

promise_test(async t => {

  function dummyCallback(records, observer) {};

  let success = true;

  try {

    const observer = new FileSystemObserver(dummyCallback);

  } catch (error) {

    success = false;

  assert_true(success);

}, 'Creating a FileSystemObserver from a window succeeds');

promise_test(async t => {

  const dedicated_worker =

      create_dedicated_worker(t, kDedicatedWorkerMessageTarget);

  dedicated_worker.postMessage({type: 'create-file-system-observer'});

  const event_watcher = new EventWatcher(t, dedicated_worker, 'message');

  const message_event = await event_watcher.wait_for('message');

  const response = message_event.data;

  assert_true(response.createObserverSuccess);

}, 'Creating a FileSystemObserver from a dedicated worker succeeds');

if (self.SharedWorker !== undefined) {

  promise_test(async t => {

    const shared_worker = new SharedWorker(kSharedWorkerMessageTarget);

    shared_worker.port.start();

    shared_worker.port.postMessage({type: 'create-file-system-observer'});

    const event_watcher = new EventWatcher(t, shared_worker.port, 'message');

    const message_event = await event_watcher.wait_for('message');

    const response = message_event.data;

    assert_true(response.createObserverSuccess);

  }, 'Creating a FileSystemObserver from a shared worker succeeds');

promise_test(async t => {

  const scope = `${kServiceWorkerMessageTarget}?create-observer`;

  const registration =

      await create_service_worker(t, kServiceWorkerMessageTarget, scope);

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

  registration.active.postMessage({type: 'create-file-system-observer'});

  const event_watcher = new EventWatcher(t, navigator.serviceWorker, 'message');

  const message_event = await event_watcher.wait_for('message');

  const response = message_event.data;

  assert_false(response.createObserverSuccess);

}, 'Creating a FileSystemObserver from a service worker fails');