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diff --git a/dom/tests/mochitest/chrome/test_cyclecollector.xul b/dom/tests/mochitest/chrome/test_cyclecollector.xul
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+++ b/dom/tests/mochitest/chrome/test_cyclecollector.xul
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+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=
+-->
+<window title="Mozilla Bug "
+ xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+ <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+
+ <!-- test results are displayed in the html:body -->
+ <body xmlns="http://www.w3.org/1999/xhtml">
+ <a href="https://bugzilla.mozilla.org/show_bug.cgi?id="
+ target="_blank">Mozilla Bug </a>
+ </body>
+
+ <!-- test code goes here -->
+ <script type="application/javascript">
+ <![CDATA[
+ /** Test for Bug **/
+ let Ci = Components.interfaces;
+ var obs = Components.classes["@mozilla.org/observer-service;1"]
+ .getService(Ci.nsIObserverService);
+ var didCall = false;
+ var observer = {
+ QueryInterface: function QueryInterface(aIID) {
+ if (aIID.equals(Ci.nsIObserver) ||
+ aIID.equals(Ci.nsISupports))
+ return this;
+ throw Components.results.NS_NOINTERFACE;
+ },
+ observe: function(subject, topic, data) {
+ obs.removeObserver(observer, "cycle-collector-begin");
+ observer = null;
+ didCall = true;
+ }
+ };
+
+ // Start an incremental GC, to make sure that calling ccSlice
+ // when an IGC is running finishes the GC.
+ SpecialPowers.Cu.getJSTestingFunctions().gcslice(1);
+
+ // Make sure that we call the observer even if we're in the middle
+ // of an ICC when we add the observer. See bug 981033.
+ SpecialPowers.finishCC();
+ SpecialPowers.ccSlice(1);
+
+ obs.addObserver(observer, "cycle-collector-begin", false);
+
+ SpecialPowers.DOMWindowUtils.cycleCollect();
+
+ ok(didCall, "Observer should have been called!");
+ ]]>
+ </script>
+</window>