title: How to use TextTestRunner class from Python unittest module in failfast mode?
body: <p>All I found in documentation of <code>unittest</code> module is <a href="http://docs.python.org/library/unittest.html#unittest.TextTestRunner">description</a> of <code>TextTestRunner</code>'s constructor and the following sample code using its <code>run()</code> method:
  <code>unittest.TextTestRunner(verbosity=2).run(suite)</code></p>
  
  <p>I would like to know how I can use <code>TextTestRunner</code> in failfast mode.</p>