code: def test_get_render_fn_from_environment():
      """We have a method to get the render_fn from the environment."""
      # When
      result = _get_render_fn_from_environment("render_fn_2", __file__)
      # Then
      assert result.__name__ == render_fn_2.__name__
      assert inspect.getmodule(result).__file__ == __file__
  
file_path: pytorch-lightning/tests/tests_app/frontend/panel/test_panel_serve_render_fn.py
imports: import inspect
  import os
  from unittest import mock
  import pytest
  from lightning.app.frontend.panel.app_state_watcher import AppStateWatcher
  from lightning.app.frontend.panel.panel_serve_render_fn import _get_render_fn, _get_render_fn_from_environment
  from lightning_utilities.core.imports import RequirementCache
label_desc: Use image node_id 7 for calling a global function with example usage: test_get_render_fn_from_environment() without return types