test_windowProxyDeadWrapper.html

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<!DOCTYPE HTML>

<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=1223372

-->

<head>

  <meta charset="utf-8">

  <title>Test for Bug 1223372</title>

  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css" href="chrome://global/skin"/>

  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>

  <script type="application/javascript">

/** Test for Bug 1223372 **/

const {TestUtils} = ChromeUtils.importESModule(

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

);

async function go() {

    SimpleTest.waitForExplicitFinish();

    await SpecialPowers.pushPrefEnv({"set": [["security.allow_eval_with_system_principal",

                                             true]]});

    var frame = $('subframe');

    frame.onload = null;

    var w = frame.contentWindow;

    w.eval("checkDead = function() { return Components.utils.isDeadWrapper(this); };");

    var checkDead = w.checkDead;

    w.eval("getObject = function() { return {}; }");

    var getObject = w.getObject;

    ok(!checkDead(), "WindowProxy shouldn't be dead yet");

    // Load a content page in the chrome frame.

    w.location = "https://example.org/tests/js/xpconnect/tests/mochitest/file_empty.html";

    tryWindow();

    function tryWindow() {

        if (w.document.title != 'empty test page') {

            info("Document not loaded yet - retrying");

            SimpleTest.executeSoon(tryWindow);

            return;

        let winID = w.docShell.outerWindowID;

        // Remove the frame. This will nuke the WindowProxy wrapper from our chrome

        // document's global, so evaluating 'this' in it will return a dead wrapper

        // once the window is destroyed.

        frame.remove();

        TestUtils.topicObserved("outer-window-nuked", (subject) => {

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

            return id == winID;

        }).then(() => {

            ok(checkDead(), "Expected a dead object wrapper");

            // Wrapping the Window should return a dead wrapper now.

            var global = Cu.getGlobalForObject(getObject());

            ok(Cu.isDeadWrapper(global),

               "Expected a dead wrapper when requesting the window's global");

            SimpleTest.finish();

});

  </script>

</head>

<body>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1223372">Mozilla Bug 1223372</a>

<iframe id="subframe" src="./file_empty.html" onload="go()"></iframe>

</body>

</html>