code: def test_init_dialogue(self):
      init_prompt_txt = generate_init_prompot()
      self.assertIsNotNone(init_prompt_txt)
      self.assertIsInstance(init_prompt_txt, str)
      self.assertGreater(len(init_prompt_txt), 5)
  
imports: from parlai.core.opt import Opt
  from parlai.utils.misc import Timer, round_sigfigs, set_namedtuple_defaults, nice_report
  import parlai.utils.strings
  from copy import deepcopy
  import random
  import time
  import unittest
  from parlai.utils.data import DatatypeHelper
  from parlai.utils.curated_response import generate_init_prompot, generate_safe_response
label_desc: Use image node_id 1 for calling the TestCuratedResponseGenerator obj's underlying member method code with example usage: obj.test_init_dialogue() without return types