code: def test_safe_response(self):
      safe_txt = generate_safe_response()
      self.assertIsNotNone(safe_txt)
      self.assertIsInstance(safe_txt, str)
      self.assertGreater(len(safe_txt), 10)
      self.assertGreater(len(safe_txt.split(" ")), 3)
  
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 2 for calling the TestCuratedResponseGenerator obj's underlying member method code with example usage: obj.test_safe_response() without return types