docs: def tearDown(self):
          """Clean up after each case.
  
          Stop harness service, close browser and close DUT.
          """
          if self.__class__ is HarnessCase:
              return
  
          logger.info('Tearing down')
          self._destroy_harness()
          self._destroy_browser()
          self._destroy_dut()
          self._destroy_rf_shield()