code: def test_safe_pickle_app():
      test_dir = Path(__file__).parent / "testdata"
      proc = subprocess.Popen(
          [
              "lightning",
              "run",
              "app",
              "safe_pickle_app.py",
              "--open-ui",
              "false",
          ],
          stdout=subprocess.PIPE,
          cwd=test_dir,
      )
      stdout, _ = proc.communicate()
      assert "Exiting the pickling app successfully" in stdout.decode(
          "UTF-8"
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_safe_pickle_app() without return types