code: def wait_for_applications_running(self, application_names: List[str]):
      client = _get_global_client()
      for name in application_names:
          client._wait_for_application_running(name, timeout_s=60)
  
imports: import asyncio
  import logging
  import os
  import random
  import string
  import time
  from typing import List
  import requests
  import ray
  from ray import serve
  from ray.serve.context import _get_global_client
  from ray.cluster_utils import Cluster
  from ray._private.test_utils import safe_write_to_results_json
label_desc: Use image node_id 2 for calling the RandomTest obj's underlying member method code with example usage: obj.wait_for_applications_running(application_names) without return types