browser_shutdown_pref.js

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/* 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";

const PREF_ACCESSIBILITY_FORCE_DISABLED = "accessibility.force_disabled";

add_task(async function testForceDisable() {

ok(

    !Services.appinfo.accessibilityEnabled,

    "Accessibility is disabled by default"

);

  info("Reset force disabled preference");

  Services.prefs.clearUserPref(PREF_ACCESSIBILITY_FORCE_DISABLED);

  info("Enable accessibility service via XPCOM");

  let [a11yInitObserver, a11yInit] = initAccService();

  await a11yInitObserver;

  let accService = Cc["@mozilla.org/accessibilityService;1"].getService(

    Ci.nsIAccessibilityService

);

  await a11yInit;

  ok(Services.appinfo.accessibilityEnabled, "Accessibility is enabled");

  info("Force disable a11y service via preference");

  let [a11yShutdownObserver, a11yShutdown] = shutdownAccService();

  await a11yShutdownObserver;

  Services.prefs.setIntPref(PREF_ACCESSIBILITY_FORCE_DISABLED, 1);

  await a11yShutdown;

  ok(!Services.appinfo.accessibilityEnabled, "Accessibility is disabled");

  info("Attempt to get an instance of a11y service and call its method.");

  accService = Cc["@mozilla.org/accessibilityService;1"].getService(

    Ci.nsIAccessibilityService

);

  try {

    accService.getAccesssibleFor(document);

    ok(false, "getAccesssibleFor should've triggered an exception.");

  } catch (e) {

ok(

      true,

      "getAccesssibleFor triggers an exception as a11y service is shutdown."

);

  ok(!Services.appinfo.accessibilityEnabled, "Accessibility is disabled");

  info("Reset force disabled preference");

  Services.prefs.clearUserPref(PREF_ACCESSIBILITY_FORCE_DISABLED);

  info("Create a11y service again");

  [a11yInitObserver, a11yInit] = initAccService();

  await a11yInitObserver;

  accService = Cc["@mozilla.org/accessibilityService;1"].getService(

    Ci.nsIAccessibilityService

);

  await a11yInit;

  ok(Services.appinfo.accessibilityEnabled, "Accessibility is enabled");

  info("Remove all references to a11y service");

  [a11yShutdownObserver, a11yShutdown] = shutdownAccService();

  await a11yShutdownObserver;

  accService = null;

  forceGC();

  await a11yShutdown;

  ok(!Services.appinfo.accessibilityEnabled, "Accessibility is disabled");

});