code: def test_abstract(self):
      name = "unregistered_builder"
      self.assertEqual(name, UnregisteredBuilder.name)
      self.assertNotIn(name, load.list_builders())
  
      with self.assertRaisesWithPredicateMatch(
          TypeError, "Can't instantiate abstract class"
      ):
          load.builder(name)
  
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 3 for calling the RegisteredTest obj's underlying member method code with example usage: obj.test_abstract() without return types