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diff --git a/js/xpconnect/tests/chrome/test_bug448587.xhtml b/js/xpconnect/tests/chrome/test_bug448587.xhtml
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+++ b/js/xpconnect/tests/chrome/test_bug448587.xhtml
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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=448587.xul
+-->
+<window title="Mozilla Bug 503926"
+ xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+ <script 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">
+ <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=448587"
+ target="_blank">Mozilla Bug 448587</a>
+ </body>
+
+ <!-- test code goes here -->
+ <script type="application/javascript">
+ <![CDATA[
+
+ // Bonus test - collaborate with test_bug361111.xhtml to make sure that
+ // flushPrefEnv is appropriately called.
+ ok(!SpecialPowers.Services.prefs.prefHasUserValue('testing.some_arbitrary_pref'),
+ "Pref shouldn't carry over from previous test!");
+
+
+ /** Test for Bug 448587 **/
+ var sandbox = new Cu.Sandbox("about:blank");
+ var fwrapper = Cu.evalInSandbox("function f() {} f", sandbox);
+ is(Cu.unwaiveXrays(Cu.waiveXrays(fwrapper).prototype), Cu.evalInSandbox("f.prototype", sandbox),
+ ".prototype visible through .wrappedJSObject");
+ is(fwrapper.prototype, undefined, ".prototype invisible through Xrays");
+ ]]>
+ </script>
+</window>