class_docstr: OSS Filesystem Tests
code: def test_walk_failure(self):
      dir_path = file_io.join(self._base_dir, "test_dir")
      # Try walking a directory that wasn't created.
      all_dirs = []
      all_subdirs = []
      all_files = []
      for w_dir, w_subdirs, w_files in file_io.walk(
          dir_path, in_order=False
      ):
          all_dirs.append(w_dir)
          all_subdirs.append(w_subdirs)
          all_files.append(w_files)
      self.assertItemsEqual(all_dirs, [])
      self.assertItemsEqual(all_subdirs, [])
      self.assertItemsEqual(all_files, [])
  
imports: import os
  import unittest
  from tensorflow.python.framework import errors
  from tensorflow.python.lib.io import file_io
  from tensorflow.python.platform import test
  from tensorflow.python.platform import gfile
  import tensorflow
  import tensorflow_io
label_desc: Use image node_id 30 for calling the OSSFSTest obj's underlying member method code with example usage: obj.test_walk_failure() without return types