code: def test_vanilla(self):
      SelfChat.main(model="fixed_response", fixed_response="hi")
  
file_path: ParlAI/tests/test_self_chat.py
imports: from tempfile import NamedTemporaryFile
  import unittest
  from parlai.scripts.self_chat import SelfChat
  import parlai.utils.testing
label_desc: Use image node_id 1 for calling the TestSelfChat obj's underlying member method code with example usage: obj.test_vanilla() without return types