code: def test_multiworld_stream(self):
      self._test_correct_processed(
          NUM_TEST + NUM_TEST * EXAMPLE_SIZE,
          task="integration_tests:variable_length,integration_tests:multiturn",
          datatype="train:stream",
      )
  
imports: from parlai.core.opt import Opt
  from parlai.tasks.integration_tests.agents import NUM_TEST, EXAMPLE_SIZE
  from parlai.utils.conversations import Conversations
  import parlai.utils.testing
  import os
  from typing import Dict, Any
  import unittest
label_desc: Use image node_id 9 for calling the TestDynamicBatching obj's underlying member method code with example usage: obj.test_multiworld_stream() without return types