code: def check(self, diff):
          r
          filename = pathlib.Path(diff.b_path).parts[-1]
          is_valid_feature_module_name = re_test(
              FEATURE_MODULE_NAME_REGEX, filename)
          is_valid_init_module_name = filename == '__init__.py'
          assert is_valid_feature_module_name or is_valid_init_module_name
docs: r"""Check that the new file introduced has a valid name
  
          The module can either be an __init__.py file or must
          match ``feature_[a-zA-Z0-9_]+\.\w+``.