title: QUnit: How to test ajax call without modifying the ajax call
body: <p>How can I write a QUnit test for this:</p>
  
  <pre><code>function doSomethingWithAjax() {
      $.ajax({
          url: '/GetHelloWorld',
          success: function(data) { $("#responseFromServer").text(data); },
      });
  }
  </code></pre>
  
  <p>Mockjax+qunit requires a start() call in the ajax complete() method.</p>