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diff --git a/js/xpconnect/tests/chrome/test_bug858101.xul b/js/xpconnect/tests/chrome/test_bug858101.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=858101
+-->
+<window title="Mozilla Bug 858101"
+ 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=858101"
+ target="_blank">Mozilla Bug 858101</a>
+ </body>
+
+ <!-- test code goes here -->
+ <script type="application/javascript">
+ <![CDATA[
+
+ /** Test for [[DefaultValue]] on XrayWrappers. **/
+ SimpleTest.waitForExplicitFinish();
+
+ function muckWithToString() {
+ function tricky() { return "hah"; };
+
+ window.toString = document.toString = document.body.toString = tricky;
+ window.valueOf = document.valueOf = document.body.valueOf = tricky;
+
+ Window.prototype.toString = Window.prototype.valueOf = tricky;
+ Document.prototype.toString = Document.prototype.valueOf = tricky;
+ HTMLBodyElement.toString = HTMLBodyElement.valueOf = tricky;
+ }
+
+ function go() {
+ var iwin = $('ifr').contentWindow;
+ iwin.wrappedJSObject.eval('(' + muckWithToString.toSource() + ')()');
+
+ // Check behavior with vanilla CCWs.
+ ok(!!/hah/.exec(iwin.wrappedJSObject + ""), "Waivers should get content-defined window stringification");
+ ok(!!/hah/.exec(iwin.document.wrappedJSObject + ""), "Waivers should get content-defined document stringification");
+ ok(!!/hah/.exec(iwin.document.body.wrappedJSObject + ""), "Waivers should get content-defined body stringification");
+
+ // Check Xray behavior.
+ ok(!/hah/.exec(iwin + ""), "Xrays should not get content-defined window stringification");
+ ok(!/hah/.exec(iwin.document + ""), "Xrays should not get content-defined document stringification");
+ ok(!/hah/.exec(iwin.document.body + ""), "Xrays should not get content-defined body stringification");
+
+ SimpleTest.finish();
+ }
+
+ ]]>
+ </script>
+ <iframe id="ifr" onload="go();" type="content" src="http://example.org/tests/js/xpconnect/tests/mochitest/file_empty.html" />
+</window>