title: Mark a PHPUnit test class as to be ignored
body: <p>I have written an abstract test case class that is to be extended by concrete test case classes.</p>
  
  <p>It extends from the <strong>PHPUnit_TestCase</strong>.</p>
  
  <p>Is there a method or annotation that signals Phpunit to not execute this abstract test (but does not mark it as skipped or incomplete)?</p>
  
  <p>Right now Phpunit runs the abstract test class as well and then reports an error that it can not instantiate it - which is by language: An abstract class can not be instantiated.</p>