code: def test_create_group(self) -> None:
      runtime_group = RuntimeManager().create_group()
      for runtime_name in RUNTIME_NAMES:
          assert runtime_name in runtime_group._runtimes
          assert isinstance(
              runtime_group._runtimes[runtime_name], Runtime
          )
  
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 1 for calling the TestRuntimeManager obj's underlying member method code with example usage: obj.test_create_group() without return types