code: def test_setup_custom_tunnel():
      io = Interface(lambda x: x, "number", "number")
      io.launch(
          show_error=True,
          prevent_thread_lock=True,
          share_server_address="my-gpt-wrapper.com:7000",
      )
      share_url = networking.setup_tunnel(
          io.server_name,
          io.server_port,
          io.share_token,
          io.share_server_address,
      )
      assert isinstance(share_url, str)
  
label_desc: Use image node_id 2 for calling a global function with example usage: test_setup_custom_tunnel() without return types