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Test Info:

<html>
<head>
<script type="text/javascript" src="../MochiKit/MochiKit.js"></script>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="SimpleTest/test.css">
</head>
<body>
<pre id="test">
<script type="text/javascript">
is( isUndefined(null), false, "null is not undefined" );
is( isUndefined(""), false, "empty string is not undefined" );
is( isUndefined(undefined), true, "undefined is undefined" );
is( isUndefined({}.foo), true, "missing property is undefined" );
</script>
</pre>
</body>
</html>