code: def test_get_filesystem_remote_workers(shutdown_only, tmp_path):
      path = os.path.join(str(tmp_path), "foo/bar")
      ray.init(storage=path, num_gpus=1)
  
      @ray.remote
      def check():
          fs, prefix = storage.get_filesystem()
          assert fs is not None
          return "ok"
  
      assert ray.get(check.remote()) == "ok"
      os.unlink(os.path.join(path, "_valid"))
  
      @ray.remote(num_gpus=1)  # Force a new worker.
      def check():
          storage.get_filesystem()  # Crash since the valid file is deleted.
  
      with pytest.raises(RuntimeError):
          ray.get(check.remote())
  
imports: import os
  import sys
  import subprocess
  import urllib
  from pathlib import Path
  from packaging.version import parse
  import pyarrow.fs
  import pytest
  import ray
  import ray._private.storage
  from ray._private.test_utils import simulate_storage
  from ray._private.utils import _add_creatable_buckets_param_if_s3_uri, _get_pyarrow_version
  from ray.tests.conftest import *
label_desc: Use image node_id 9 for calling a global function with example usage: test_get_filesystem_remote_workers(shutdown_only, tmp_path) and returns: str