title: Exclude tests from xctool
body: <p>Is it possible to exclude a specific unit test or test suite from <a href="https://github.com/facebook/xctool" rel="nofollow"><code>xctool</code></a>?</p>
  
  <p>I noticed that <code>xctool</code> allows me to specify specific tests to run with the <code>-only</code> flag. I would like to do the opposite.</p>
  
  <p>The reason is that some tests require components that are not available in the console test environment.</p>
  
  <p>If there is no flag to do this (I couldn't find any in the documentation), what would be the best alternative?</p>