QUnit async mockjax

HTML

<script src="http://code.jquery.com/qunit/qunit-1.9.0.js"></script>
<link rel="stylesheet" href="http://code.jquery.com/qunit/qunit-1.9.0.css">
<script src="https://raw.github.com/appendto/jquery-mockjax/master/jquery.mockjax.js"></script>
<body>
    <h1 id="qunit-header">
        QUnit example</h1>
    <h2 id="qunit-banner">
    </h2>
    <div id="qunit-testrunner-toolbar">
    </div>
    <h2 id="qunit-userAgent">
    </h2>
    <ol id="qunit-tests">
    </ol>
    <div id="qunit-fixture">
        test markup, will be hidden</div>
</body>

JavaScript

$(document).ready(function() {

    function functionToTest() {
        return $.getJSON('/echo/json/', {
            json: JSON.stringify({
                "won't": "run"
            })
        });
    }

    var mockHandlerID = $.mockjax({
        url: '/echo/json/',
        whatToSay: 'HEYO',
        response: function(req) {
            this.responseText = JSON.stringify({
                hello: $.mockjax.handler(mockHandlerID).whatToSay
            });
            // or more complex stuff
        }
    });
    // holds a backup of the mockjax handler
    var _oldhandler;

    module("reverse", {
        setup: function() {
            //keep a copy of the old handler settings
            _oldhandler = $.extend({}, $.mockjax.handler(mockHandlerID));

            // Make a copy of the mock settigns for use in this module
            // Also add default settings for module to it.
            $.mockjax.handler(mockHandlerID).response = function(req) {
                this.responseText = JSON.stringify({
                    hello: 'OYEH'
                });
            };
        },
        teardown: function() {
            $.mockjaxClear(mockHandlerID);
            mockHandlerID = $.mockjax(_oldhandler);
        }
    });

    asyncTest("tset tsrif", function() {
        functionToTest().done(function(json) {
            equal(json && json.hello, 'OYEH');

            $.mockjax.handler(mockHandlerID).response = (function() {
                this.responseText = JSON.stringify({
                    hello: 'OtherText'
                });
            });

            functionToTest().done(function(json) {
                equal(json && json.hello, 'OtherText');
                start();
            });
        });
    });

    asyncTest("tset dnoces", function() {
        functionToTest().done(function(json) {
            equal(json && json.hello, 'OYEH');
            start();
        });
    });

    module("normal"); //back to default settings
    
    test("second...