class_docstr: Test that mutators work with teachers.
class_docstr_tok: ["Test","that","mutators","work","with","teachers","."]
code: def test_episode(self):
      examples = self._run_through(
          "integration_tests:multiturn", "episode_reverse"
      )
      examples = examples[:4]  # hardcoded for this teacher
      total = []
      for example in examples:
          total.append(example["text"])
      assert example["labels"][0] == " ".join(reversed(total))
  
imports: import unittest
  from parlai.core.params import ParlaiParser
  from parlai.core.opt import Opt
  from parlai.core.teachers import create_task_agent_from_taskname
  from parlai.core.message import Message
label_desc: Use image node_id 3 for calling the TestIntegrations obj's underlying member method code with example usage: obj.test_episode() without return types