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diff --git a/js/xpconnect/tests/mochitest/test_getWebIDLCaller.html b/js/xpconnect/tests/mochitest/test_getWebIDLCaller.html
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+++ b/js/xpconnect/tests/mochitest/test_getWebIDLCaller.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=968335
+-->
+<head>
+ <meta charset="utf-8">
+ <title>Test for Bug 968335</title>
+ <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+ <script type="application/javascript">
+
+ /** Test for Cu.getCallerPrincipal (within JS-implemented WebIDL). **/
+
+ SimpleTest.waitForExplicitFinish();
+ SpecialPowers.pushPrefEnv({set: [['dom.expose_test_interfaces', true]]}, go);
+
+
+ function go() {
+ var t = new TestInterfaceJS();
+ is(t.getCallerPrincipal(), location.origin,
+ "Cu.getCallerPrincipal works right within JS-implemented WebIDL");
+
+ try {
+ SpecialPowers.Cu.getWebIDLCallerPrincipal();
+ ok(false, "Should have thrown");
+ } catch (e) {
+ ok(/NOT_AVAILABLE/.test(SpecialPowers.wrap(e)),
+ "API should throw when invoked outside of JS-implemented WebIDL");
+ }
+
+ SimpleTest.finish();
+ }
+
+
+
+
+ </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=968335">Mozilla Bug 968335</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>