code: def set_verdict(self, verdict, retcode=-1, duration=-1):
          
          verdict = verdict.lower()
          if not verdict in ['pass', 'fail', 'unknown', 'skip', 'inconclusive']:
              raise ValueError("Unknown verdict {}".format(verdict))
          if retcode == -1 and verdict == 'pass':
              retcode = 0
          self.__verdict = verdict
          self.retcode = retcode
          if duration >= 0:
              self.duration = duration
docs: Set the final verdict for this Result.
  
          :param verdict: Verdict, must be from ['pass', 'fail', 'unknown', 'skip', 'inconclusive']'
          :param retcode: integer return code
          :param duration: test duration
          :return: Nothing
          :raises: ValueError if verdict was unknown.