js/xpconnect/tests/browser/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, data) => {
          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);
});