palemoon-dev/platform/accessible/tests/browser/browser_shutdown_start_restart.js

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

'use strict';

add_task(function* () {
  info('Creating a service');
  // Create a11y service.
  let a11yInit = initPromise();
  let accService = Cc['@mozilla.org/accessibilityService;1'].getService(
    Ci.nsIAccessibilityService);
  yield a11yInit;
  ok(accService, 'Service initialized');

  info('Removing a service');
  // Remove the only reference to an a11y service.
  let a11yShutdown = shutdownPromise();
  accService = null;
  ok(!accService, 'Service is removed');
  // Force garbage collection that should trigger shutdown.
  forceGC();
  yield a11yShutdown;

  info('Recreating a service');
  // Re-create a11y service.
  a11yInit = initPromise();
  accService = Cc['@mozilla.org/accessibilityService;1'].getService(
    Ci.nsIAccessibilityService);
  yield a11yInit;
  ok(accService, 'Service initialized again');

  info('Removing a service again');
  // Remove the only reference to an a11y service again.
  a11yShutdown = shutdownPromise();
  accService = null;
  ok(!accService, 'Service is removed again');
  // Force garbage collection that should trigger shutdown.
  forceGC();
  yield a11yShutdown;
});