code: def test_filename_fom_url_etag(self, etag: str, expected: str):
      url = "https://example.com/testdata/model.chkpt"
      filename = file_cache.filename_fom_url(url, etag)
      self.assertEqual(filename, expected)
  
file_path: lit/lit_nlp/lib/file_cache_test.py
imports: from absl.testing import absltest
  from absl.testing import parameterized
  from lit_nlp.lib import file_cache
label_desc: Use image node_id 1 for calling the FileCacheTest obj's underlying member method code with example usage: obj.test_filename_fom_url_etag(etag, expected) without return types