code: def is_running(self):
      self._MOCKS[self.name].is_running()
      return True
  
imports: import os
  import signal
  import time
  from functools import partial
  from multiprocessing import Process
  from pathlib import Path
  from unittest import mock
  from unittest.mock import ANY, MagicMock, Mock
  from click.testing import CliRunner
  from lightning.app.cli.lightning_cli_launch import run_flow, run_flow_and_servers, run_frontend, run_server
  from lightning.app.core.queues import QueuingSystem
  from lightning.app.frontend.web import StaticWebFrontend
  from lightning.app.launcher import launcher
  from lightning.app.runners.runtime import load_app_from_file
  from lightning.app.testing.helpers import EmptyWork, _RunIf
  from lightning.app.utilities.app_commands import run_app_commands
  from lightning.app.utilities.network import find_free_network_port
  from tests_app import _PROJECT_ROOT
label_desc: Use image node_id 4 for calling the MockRedisQueue obj's underlying member method code with example usage: obj.is_running() and returns: True