code: def test_empty_working_dir(start_cluster):
      """Tests the case where we pass an empty directory as the working_dir."""
      cluster, address = start_cluster
      with tempfile.TemporaryDirectory() as working_dir:
          ray.init(address, runtime_env={"working_dir": working_dir})
  
          @ray.remote
          def listdir():
              return os.listdir()
  
          assert len(ray.get(listdir.remote())) == 0
  
          @ray.remote
          class A:
              def listdir(self):
                  return os.listdir()
                  pass
  
          a = A.remote()
          assert len(ray.get(a.listdir.remote())) == 0
  
          # Test that we can reconnect with no errors
          ray.shutdown()
          ray.init(address, runtime_env={"working_dir": working_dir})
  
imports: import os
  import shutil
  import sys
  import tempfile
  import time
  from importlib import import_module
  from pathlib import Path
  from unittest import mock
  import pytest
  import ray
  from ray._private import gcs_utils
  from ray._private.runtime_env.context import RuntimeEnvContext
  from ray._private.runtime_env.packaging import get_uri_for_directory, upload_package_if_needed
  from ray._private.runtime_env.working_dir import WorkingDirPlugin, set_pythonpath_in_context
  from ray._private.utils import get_directory_size_bytes
label_desc: Use image node_id 5 for calling a global function with example usage: test_empty_working_dir(start_cluster) and returns: os, os