new_contents: """Test the respond handler."""
  
  import pytest
  
  from cactusbot.api import CactusAPI
  from cactusbot.handlers import ResponseHandler
  from cactusbot.packets import MessagePacket
  
  response_handler = ResponseHandler("TestUser")
  
  
  @pytest.mark.asyncio
  async def test_on_message():
      """Test the message event."""
  
      assert (await response_handler.on_message(
          MessagePacket("!testing", user="TestUser")
      )) == StopIteration
  
subject: Add response handler tests