code: def test_resource_to_filename(self):
      for url in [
          "http://allenai.org",
          "http://allennlp.org",
          "https://www.google.com",
          "http://pytorch.org",
          "https://allennlp.s3.amazonaws.com" + "/long" * 20 + "/url",
      ]:
          filename = _resource_to_filename(url)
          assert "http" not in filename
          with pytest.raises(FileNotFoundError):
              filename_to_url(filename, cache_dir=self.TEST_DIR)
          pathlib.Path(os.path.join(self.TEST_DIR, filename)).touch()
          with pytest.raises(FileNotFoundError):
              filename_to_url(filename, cache_dir=self.TEST_DIR)
          json.dump(
              {"url": url, "etag": None},
              open(
                  os.path.join(self.TEST_DIR, filename + ".json"), "w"
              ),
          )
          back_to_url, etag = filename_to_url(
              filename, cache_dir=self.TEST_DIR
          )
          assert back_to_url == url
          assert etag is None
  
imports: import os
  import pathlib
  import json
  import time
  import shutil
  from filelock import Timeout
  import pytest
  import responses
  import torch
  from allennlp.common.file_utils import FileLock, _resource_to_filename, filename_to_url, cached_path, open_compressed, CacheFile, _Meta, _find_entries, inspect_cache, remove_cache_entries, LocalCacheResource, TensorCache
  from allennlp.common import Params
  from allennlp.modules.token_embedders import ElmoTokenEmbedder
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.predictors import Predictor
label_desc: Use image node_id 2 for calling the TestFileUtils obj's underlying member method code with example usage: obj.test_resource_to_filename() without return types