browser_shutdown_proxy_acc_reference.js

Enable keyboard shortcuts

/* 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(async function () {

  const [a11yInitObserver, a11yInit] = initAccService();

  await a11yInitObserver;

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

    Ci.nsIAccessibilityService

);

  ok(accService, "Service initialized");

  await a11yInit;

  await BrowserTestUtils.withNewTab(

      gBrowser,

      url: `data:text/html,

      <html>

        <head>

          <meta charset="utf-8"/>

          <title>Accessibility Test</title>

        </head>

        <body><div id="div" style="visibility: hidden;"></div></body>

      </html>`,

},

    async function (browser) {

      let onShow = waitForEvent(Ci.nsIAccessibleEvent.EVENT_SHOW, "div");

      await invokeSetStyle(browser, "div", "visibility", "visible");

      let showEvent = await onShow;

      let divAcc = showEvent.accessible;

      ok(divAcc, "Accessible proxy is created");

      // Remove unnecessary dangling references

      onShow = null;

      showEvent = null;

      forceGC();

      let canShutdown = false;

      const [a11yShutdownObserver, a11yShutdownPromise] = shutdownAccService();

      await a11yShutdownObserver;

      const a11yShutdown = new Promise((resolve, reject) =>

        a11yShutdownPromise.then(() =>

          canShutdown

            ? resolve()

            : reject("Accessible service was shut down incorrectly")

);

      accService = null;

      ok(!accService, "Service is removed");

      // Force garbage collection that should not trigger shutdown because there

      // is a reference to an accessible proxy.

      forceGC();

      // Have some breathing room when removing a11y service references.

      await TestUtils.waitForTick();

      // Now allow a11y service to shutdown.

      canShutdown = true;

      // Remove a last reference to an accessible proxy.

      divAcc = null;

      ok(!divAcc, "Accessible proxy is removed");

      // Force garbage collection that should now trigger shutdown.

      forceGC();

      await a11yShutdown;

);

});