code: def test_dir_state_non_existing_dir(self):
      dirpath = "/non/existing/dir"
      result = dir_state(dirpath)
      self.assertIsNone(result)
  
imports: import asyncio
  import os
  import shutil
  import tempfile
  import unittest
  import time
  from unittest.mock import patch
  from fiftyone.operators.decorators import coroutine_timeout, dir_state
label_desc: Use image node_id 1 for calling the DirStateTests obj's underlying member method code with example usage: obj.test_dir_state_non_existing_dir() without return types