gecko-dev/js/xpconnect/tests/chrome/test_weakref.xul

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<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
<?xml-stylesheet href="chrome://mochikit/content/tests/SimpleTest/test.css"
type="text/css"?>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=484459
-->
<window title="Weakrefs"
xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
<script type="application/javascript"
src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
<!-- test results are displayed in the html:body -->
<body xmlns="http://www.w3.org/1999/xhtml">
<iframe type="content" id="ifr">
</iframe>
</body>
<!-- test code goes here -->
<script type="application/javascript"><![CDATA[
SimpleTest.waitForExplicitFinish();
var util = window.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
.getInterface(Components.interfaces.nsIDOMWindowUtils);
var weakUtil = Components.utils.getWeakReference(util);
util = null;
function callback() {
ok(weakUtil.get(), "Should still be alive here");
SimpleTest.finish();
}
SpecialPowers.exactGC(window, callback);
]]></script>
</window>