public function checkForSingleMailData($message)
 {
     if (StateKeeper::get('expected_body')) {
         $this->assertMessageContains($message, StateKeeper::get('expected_body'));
     }
     if (StateKeeper::get('expected_to')) {
         $this->assertMessageSentTo($message, StateKeeper::get('expected_to'));
     }
     if (StateKeeper::get('expected_subject')) {
         $this->assertMessagSubjectEquals($message, StateKeeper::get('expected_subject'));
     }
 }