code: def test_yaml_writer_avoids_dumping_not_existing_user_messages():
      events = [
          UserUttered("greet", {"name": "greet"}),
          ActionExecuted("utter_greet"),
      ]
      tracker = DialogueStateTracker.from_events("default", events)
      dump = YAMLStoryWriter().dumps(tracker.as_story().story_steps)
  
      assert (
          dump.strip()
          == textwrap.dedent(
              f"""
          version: "{LATEST_TRAINING_DATA_FORMAT_VERSION}"
          stories:
          - story: default
            steps:
            - intent: greet
            - action: utter_greet
  
      """
          ).strip()
      )
  
imports: from pathlib import Path
  import textwrap
  from typing import Text
  from collections import OrderedDict
  import pytest
  from rasa.shared.constants import LATEST_TRAINING_DATA_FORMAT_VERSION
  from rasa.shared.core.constants import ACTION_SESSION_START_NAME, ACTION_LISTEN_NAME, ACTION_UNLIKELY_INTENT_NAME
  from rasa.shared.core.domain import Domain
  from rasa.shared.core.events import ActionExecuted, UserUttered, DefinePrevUserUtteredFeaturization
  from rasa.shared.core.trackers import DialogueStateTracker
  from rasa.shared.core.training_data.story_reader.yaml_story_reader import YAMLStoryReader
  from rasa.shared.core.training_data.story_writer.yaml_story_writer import YAMLStoryWriter
  from rasa.shared.core.training_data.structures import STORY_START
label_desc: Use image node_id 3 for calling a global function with example usage: test_yaml_writer_avoids_dumping_not_existing_user_messages() without return types