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diff --git a/dom/base/test/chrome/test_bug120684.xul b/dom/base/test/chrome/test_bug120684.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=120684
+-->
+<window title="Mozilla Bug 120684"
+ 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=120684"
+ target="_blank">Mozilla Bug 120684</a>
+ </body>
+
+ <!-- test code goes here -->
+ <script type="application/javascript">
+ <![CDATA[
+ /** Test for Bug 120684 **/
+
+ var list = new ChromeNodeList();
+ is(list.length, 0, "Length should be initially 0.");
+
+ ok(list instanceof NodeList, "ChromeNodeList object should be an instance of NodeList.");
+
+ try {
+ list.append(document);
+ ok(false, "should have throw!");
+ } catch(ex) {
+ ok(true, "ChromeNodeList supports only nsIContent objects for now.");
+ }
+
+ try {
+ list.remove(document);
+ ok(false, "should have throw!");
+ } catch(ex) {
+ ok(true, "ChromeNodeList supports only nsIContent objects for now.");
+ }
+ is(list.length, 0, "Length should be 0.");
+
+ list.append(document.documentElement);
+ is(list.length, 1, "Length should be 1.");
+ is(list[0], document.documentElement);
+ is(list[1], undefined);
+
+ // Removing element which isn't in the list shouldn't do anything.
+ list.remove(document.createElement("foo"));
+ is(list.length, 1, "Length should be 1.");
+ is(list[0], document.documentElement);
+
+ list.remove(document.documentElement);
+ is(list.length, 0, "Length should be 0.");
+ is(list[0], undefined);
+
+ var e1 = document.createElement("foo");
+ var e2 = document.createElement("foo");
+ var e3 = document.createElement("foo");
+
+ list.append(e1);
+ list.append(e2);
+ list.append(e3);
+
+ is(list[0], e1);
+ is(list[1], e2);
+ is(list[2], e3);
+ is(list.length, 3);
+
+ list.remove(e2);
+ is(list[0], e1);
+ is(list[1], e3);
+ is(list[2], undefined);
+ is(list.length, 2);
+
+ // A leak test.
+ list.expando = list;
+
+ ]]>
+ </script>
+</window>