code: def fixture_dummy_dc():
      return testing.DummyDatasetCollection()
  
file_path: datasets/tensorflow_datasets/core/dataset_collection_builder_test.py
imports: from unittest import mock
  from etils import epath
  import pytest
  from tensorflow_datasets import testing
  from tensorflow_datasets.core import dataset_collection_builder
  from tensorflow_datasets.core.utils import version
label_desc: Use image node_id 5 for calling a global function with example usage: fixture_dummy_dc() and returns: testing