code: def testListdir(self):
      temp_dir = self._CreateDeepS3Structure()
      self._CreateDeepS3Structure(temp_dir)
      expected_files = [
          # Empty directory not returned
          # 'foo',
          "bar",
          "quuz",
          "a.tfevents.1",
          "model.ckpt",
          "waldo",
      ]
      gotten_files = gfile.listdir(temp_dir)
      self.assertCountEqual(expected_files, gotten_files)
  
imports: import boto3
  import os
  import unittest
  from moto import mock_s3
  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