code: def test_imported_builder_cls(self):
      builder = registered.imported_builder_cls("dummy_ds_1")
      self.assertEqual(builder.name, "dummy_ds_1")
  
imports: import abc
  import re
  from unittest import mock
  import pytest
  from tensorflow_datasets import testing
  from tensorflow_datasets.core import constants
  from tensorflow_datasets.core import load
  from tensorflow_datasets.core import registered
  from tensorflow_datasets.core import splits
  from tensorflow_datasets.core import utils
  from tensorflow_datasets.core.utils import py_utils
  import tensorflow_datasets.public_api
  from tensorflow_datasets.testing.dummy_config_based_datasets.dummy_ds_1 import dummy_ds_1_dataset_builder
label_desc: Use image node_id 2 for calling the ConfigBasedBuildersTest obj's underlying member method code with example usage: obj.test_imported_builder_cls() without return types