private function _validateExceptionThrown()
 {
     if (!$this->exception) {
         AssertAdapter::fail('Exception was not thrown.');
     }
 }
 public static function verify($mock)
 {
     if (!empty($mock->_called_methods)) {
         AssertAdapter::fail("Expected zero interactions but got " . MethodCall::arrayToString($mock->_called_methods));
     }
 }