browser_dead_object.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/.

*/

// For bug 773980, test that Components.utils.isDeadWrapper works as expected.

add_task(async function test() {

  const url =

    "http://mochi.test:8888/browser/js/xpconnect/tests/browser/browser_deadObjectOnUnload.html";

  let newTab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);

  let browser = gBrowser.selectedBrowser;

  let innerWindowId = browser.innerWindowID;

  let contentDocDead = await ContentTask.spawn(

    browser,

    { innerWindowId },

    async function (args) {

      let doc = content.document;

      let { TestUtils } = ChromeUtils.importESModule(

        "resource://testing-common/TestUtils.sys.mjs"

);

      let promise = TestUtils.topicObserved("inner-window-nuked", subject => {

        let id = subject.QueryInterface(Ci.nsISupportsPRUint64).data;

        return id == args.innerWindowId;

});

      content.location = "http://mochi.test:8888/";

      await promise;

      return Cu.isDeadWrapper(doc);

);

  is(contentDocDead, true, "wrapper is dead");

  BrowserTestUtils.removeTab(newTab);

});