title: How can you test the contents of a UIAlertAction handler with OCMock
body: <p>I've got an app where I push a <code>UIAlertController</code> with several custom <code>UIAlertAction</code>s.  Each <code>UIAlertAction</code> performs unique tasks in the handler block of <code>actionWithTitle:style:handler:</code>.</p>
  
  <p>I have several methods that I need to verify are executed within these blocks.</p>
  
  <p>How can I execute the <code>handler</code> block so that I can verify that these methods are executed?</p>