title: Skip unittest if some-condition in SetUpClass fails
body: <p>I was playing with <code>pyUnit</code> framework for unittest testing of my application. Is there any any way to skip all the tests in class if certain condition in setUpClass fails? </p>
  
  <p>Currently, I am setting up environment (creating resources, configuring global settings) in setUpClass. But, if any of these resource creation fails..I am raising exception. Instead of that I want to skip the whole test suite.</p>