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https://bugzilla.mozilla.org/show_bug.cgi?id=693615
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  <title>Test for Bug 693615</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=693615">Mozilla Bug 693615</a>
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<pre id="test">
<script type="application/javascript">

/** Test for Bug 693615 **/
/*
The following code tests if calling the DOM method Node::lookupNamespaceURI
directly (with quickstubs) and through XPCOM leads to the same result.
*/

var content = document.getElementById("content");

// called directly (quickstubs)
var defaultNS = content.lookupNamespaceURI(null);
is(defaultNS, null, "direct access working");

// called via XPCOM
// deleting the method from the prototype forces the engine to go through XPCOM
var proto = Object.getPrototypeOf(content);
delete(proto.lookupNamespaceURI);
var wrapperNS = content.lookupNamespaceURI(null);
is(wrapperNS, null, "access through XPCOM working");

</script>
</pre>
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