code: def run(self):
      if self.finish:
          self.stop()
      if self.w.status.stage == WorkStageStatus.STOPPED:
          with pytest.raises(
              Exception,
              match="A work can be started only once for now.",
          ):
              self.w.start()
          self.finish = True
      if self.w.status.stage == WorkStageStatus.NOT_STARTED:
          self.w.start()
      if self.w.status.stage == WorkStageStatus.STARTED:
          self.w.run()
      if self.w.counter == 1:
          self.w.stop()
  
imports: import contextlib
  from queue import Empty
  from re import escape
  from unittest.mock import MagicMock, Mock
  import pytest
  from lightning.app import LightningApp
  from lightning.app.core.flow import LightningFlow
  from lightning.app.core.work import LightningWork
  from lightning.app.runners import MultiProcessRuntime
  from lightning.app.storage.path import Path
  from lightning.app.testing.helpers import EmptyFlow, EmptyWork, _MockQueue
  from lightning.app.testing.testing import LightningTestApp
  from lightning.app.utilities.enum import WorkStageStatus, make_status
  from lightning.app.utilities.exceptions import LightningWorkException
  from lightning.app.utilities.imports import _IS_WINDOWS
  from lightning.app.utilities.packaging.build_config import BuildConfig
  from lightning.app.utilities.proxies import ProxyWorkRun, WorkRunner
label_desc: Use image node_id 2 for calling the FlowStart obj's underlying member method code with example usage: obj.run() without return types