code: def run(self):
      pass
  
file_path: pytorch-lightning/tests/tests_app/frontend/test_stream_lit.py
imports: import os
  import runpy
  import sys
  from unittest import mock
  from unittest.mock import ANY, Mock
  import pytest
  from lightning.app import LightningFlow
  from lightning.app.frontend.stream_lit import StreamlitFrontend
  from lightning.app.utilities.state import AppState
  from lightning_utilities.core.imports import RequirementCache
label_desc: Use image node_id 2 for calling the MockFlow obj's underlying member method code with example usage: obj.run() without return types