io/tests/smoketest.html

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Test Page</title>
</head>
<body class="yui3-skin-sam">

<div id="log"></div>

<script src="/build/yui/yui.js"></script>
<script>
YUI({
    filter: (window.location.search.match(/[?&]filter=([^&]+)/) || [])[1] || 'min'
}).use('test-console', 'test', 'io-base', function (Y) {

    (new Y.Test.Console()).render('log'),
        smoketest = new Y.Test.Case({
            name: "IO Smoke Test",
            "Y.IO should not be null": function () {
                var io = new Y.IO();
                Y.Assert.areNotSame(io, null);
            }
        }),
        suite = new Y.Test.Suite("IO Smoke Test Suite");

    suite.add(smoketest);

    Y.Test.Runner.add(suite);
    Y.Test.Runner.run();
});
</script>

</body>
</html>