code: def testGenerateFiles(self):
      tmp_dir = self.get_temp_dir()
      (_, tmp_file_path) = tempfile.mkstemp(dir=tmp_dir)
      tmp_file_name = os.path.basename(tmp_file_path)
  
      # Generate a trivial file and assert the file exists.
      def test_generator():
          yield {"inputs": [1], "target": [1]}
  
      filenames = generator_utils.train_data_filenames(
          tmp_file_name, tmp_dir, 1
      )
      generator_utils.generate_files(test_generator(), filenames)
      self.assertTrue(
          tf.gfile.Exists(tmp_file_path + "-train-00000-of-00001")
      )
  
      # Clean up.
      os.remove(tmp_file_path + "-train-00000-of-00001")
      os.remove(tmp_file_path)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import gzip
  import io
  import os
  import tempfile
  from builtins import bytes
  from tensor2tensor.data_generators import generator_utils
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling the GeneratorUtilsTest obj's underlying member method code with example usage: obj.testGenerateFiles() without return types