class_docstr: Tests for chat service agent functionality.
code: def _get_args(self):
      parser = ParlaiParser(False, False)
      parser.add_parlai_data_path()
      parser.add_messenger_args()
      return parser.parse_args([])
  
file_path: ParlAI/tests/test_chat_service.py
imports: import unittest
  from parlai.chat_service.utils.config import WorldConfig
  from parlai.chat_service.services.messenger.agents import MessengerAgent
  from parlai.chat_service.services.messenger.messenger_manager import MessengerManager
  from parlai.core.params import ParlaiParser
label_desc: Use image node_id 1 for calling the TestChatServiceAgent obj's underlying member method code with example usage: obj._get_args() and returns: parser