/**
  * Overrides SimpleTestCase::assert to enable calling of skipIf() from within tests
  *
  * @param Expectation $expectation
  * @param mixed $compare
  * @param string $message
  * @return boolean|null
  * @access public
  */
 function assert(&$expectation, $compare, $message = '%s')
 {
     if ($this->_should_skip) {
         return;
     }
     return parent::assert($expectation, $compare, $message);
 }