code: def testListdir(self):
      temp_dir = self.get_temp_dir()
      self._CreateDeepDirectoryStructure(temp_dir)
      expected_files = (
          "foo",
          "bar",
          "quuz",
          "a.tfevents.1",
          "model.ckpt",
          "waldo",
      )
      self.assertCountEqual(expected_files, gfile.listdir(temp_dir))
  
imports: import io
  import os
  from tensorboard import test
  from tensorboard.compat.tensorflow_stub import errors
  from tensorboard.compat.tensorflow_stub.io import gfile
label_desc: Use image node_id 4 for calling the GFileTest obj's underlying member method code with example usage: obj.testListdir() without return types