code: def validate(runtime_env_dict: dict) -> str:
      return None
  
imports: import asyncio
  import logging
  import os
  from pathlib import Path
  import time
  from unittest import mock
  import tempfile
  import json
  from typing import List
  import pytest
  import ray
  from ray._private.runtime_env.context import RuntimeEnvContext
  from ray._private.runtime_env.plugin import RuntimeEnvPlugin
  from ray._private.test_utils import enable_external_redis, wait_for_condition
  from ray.exceptions import RuntimeEnvSetupError
  from ray.runtime_env.runtime_env import RuntimeEnv
label_desc: Use image node_id 1 for calling the PriorityTestPlugin2 obj's underlying member method code with example usage: obj.validate(runtime_env_dict) and returns: None