title: Run selected test classes with xcodebuild or Xcode
body: <p>I have several test classes in a test target configured in Xcode. I would like to run some selected tests only. </p>
  
  <p>Say I have the following tests under my test target.</p>
  
  <ul>
  <li>ClassATests</li>
  <li>ClassBTests</li>
  <li>ClassCTests</li>
  <li>ClassDTests</li>
  </ul>
  
  <p>Say that I want to run tests for ClassA and ClassB but not for ClassC and ClassD.</p>
  
  <p>AFAIK this can't be done in Xcode. I can either run all of the tests or one test class only.</p>
  
  <p>In xcodebuild, in the command line, I can't run those tests either. I have the the <code>-skip-testing</code> or <code>-only-testing</code> params but I can't make them work with more than one test-identifier.</p>
  
  <p>Is there a way to run those tests in isolation?</p>