title: Is it possible to debug PhpUnit tests with --process-isolation option?
body: <p>For unittest</p>
  
  <pre><code>class SampleTest extends PHPUnit_Framework_TestCase
  {
      public function testBreakpoint()
      {
          $a = 18;
      }
  }
  </code></pre>
  
  <p>with breakpoint on line 5 "$a = 18;",</p>
  
  <ul>
  <li>Xdebug v2.1.0, </li>
  <li>PHPUnit 3.6.10,  </li>
  <li>PHP 5.3.6, </li>
  <li>ubuntu 10.11</li>
  </ul>
  
  <p>Running unittest with NO --process-isolation option stops script execution on the line 5, as expected.
  Running the same configuration WITH --process-isolation option does not stop execution on line 5.</p>
  
  <p>The option --process-isolation runs every test in new process using 'proc_open' in runJob function in <a href="https://github.com/sebastianbergmann/phpunit/blob/3.6/PHPUnit/Util/PHP.php" rel="noreferrer">https://github.com/sebastianbergmann/phpunit/blob/3.6/PHPUnit/Util/PHP.php</a></p>
  
  <p>Tested with PhpStorm 3 and vim 7 with debugger plugin. It allows to debug PHPUnit itself, but not testcases.</p>
  
  <p>Is there any way to debug the child process created by PhpUnit using Xdebug?  may be Zend Debugger?</p>