code: def test_verify_data(self):
      from parlai.scripts.verify_data import VerifyData
  
      report = VerifyData.main(task="integration_tests")
      assert report["did_not_return_message"] == 0
      assert report["empty_string_label_candidates"] == 0
      assert report["exs"] == 500
      assert report["label_candidates_with_missing_label"] == 0
      assert report["missing_label_candidates"] == 0
      assert report["missing_labels"] == 0
      assert report["missing_text"] == 0
  
imports: import os
  import unittest
  from parlai.core.message import Message
  from parlai.core.mutators import MessageMutator, register_mutator
  import parlai.utils.testing
label_desc: Use image node_id 1 for calling the TestVerifyData obj's underlying member method code with example usage: obj.test_verify_data() without return types