def _RunMakeCTLogListTests(input_api, output_api):
  """Runs make_ct_known_logs_list unittests if related files were modified."""
  files = (input_api.os_path.normpath(x) for x in
           ('components/certificate_transparency/tools/make_ct_known_logs_list.py',
            'components/certificate_transparency/tools/make_ct_known_logs_list_unittest.py',
            'components/certificate_transparency/data/log_list.json'))
  if not any(f in (af.LocalPath() for af in input_api.change.AffectedFiles())
             for f in files):
    return []
  test_path = input_api.os_path.join(input_api.PresubmitLocalPath(),
                                     'make_ct_known_logs_list_unittest.py')
  cmd_name = 'make_ct_known_logs_list_unittest'
  cmd = [input_api.python_executable, test_path]
  test_cmd = input_api.Command(
    name=cmd_name,
    cmd=cmd,
    kwargs={},
    message=output_api.PresubmitPromptWarning)
  return input_api.RunTests([test_cmd])