code: def test_echo(self) -> None:
      runtime_name = RUNTIME_NAMES[len(RUNTIME_NAMES) - 1]
      rt = Runtime(runtime_name)
      msg = f"Hello Runtime {runtime_name}"
      assert rt.echo(msg).rstrip("\n") == msg
  
imports: import os
  import re
  import sys
  import time
  from subprocess import PIPE, run
  from types import ModuleType
  from typing import Union
  import docker
  import requests
  import storm.__main__
  from lazycluster import Runtime, RuntimeGroup, RuntimeManager, RuntimeTask
  from .config import RUNTIME_DOCKER_IMAGE, RUNTIME_NAMES, WORKSPACE_PORT
label_desc: Use image node_id 2 for calling the TestRuntime obj's underlying member method code with example usage: obj.test_echo() without return types