code: def testMaybeDownload(self):
      tmp_dir = self.get_temp_dir()
      (_, tmp_file_path) = tempfile.mkstemp(dir=tmp_dir)
      tmp_file_name = os.path.basename(tmp_file_path)
  
      # Download Google index to the temporary file.http.
      res_path = generator_utils.maybe_download(
          tmp_dir, tmp_file_name + ".http", "http://google.com"
      )
      self.assertEqual(res_path, tmp_file_path + ".http")
  
      # Clean up.
      os.remove(tmp_file_path + ".http")
      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 2 for calling the GeneratorUtilsTest obj's underlying member method code with example usage: obj.testMaybeDownload() without return types