anchor.diff:  device_start_response_test_() ->
       { "start response"
       , ?setup_meck( test_start_response ) }.
  +
  +
  +device_stop_response_test_() ->
  +    { "stop response"
  +    , ?setup_meck( test_stop_response ) }.
   
   
   % setup functions
  
positive.code:     ].
  
  
  % Helper functions
  dummy_driver_config() ->
      [ { driver, ?DRIVER_NAME }
  
negative.code:     Tag = make_ref(),
      Device = #device{ pid = DeviceId },
      Devices = orddict:store( DeviceId, Device, orddict:new() ),
      Asyncs = orddict:store( Tag, { DeviceId, start }, orddict:new() ),
      S0 = #state{ devices = Devices, asyncs = Asyncs },
  
      { noreply, S1 } = handle_info( { ok, Tag }, S0 ),
  