code: def test_fetch_atlas_source():
      # specify non-existing atlas source
      with pytest.raises(ValueError, match="Atlas source"):
          atlas._get_atlas_data_and_labels("new_source", "not_inside")
  
imports: import itertools
  import os
  import re
  from pathlib import Path
  import nibabel
  import numpy
  import pandas
  import pytest
  from numpy.testing import assert_array_equal
  from nilearn._utils import data_gen
  from nilearn._utils.testing import serialize_niimg
  from nilearn.conftest import _rng
  from nilearn.datasets import atlas
  from nilearn.datasets._utils import fetch_files
  from nilearn.datasets.tests._testing import dict_to_archive
  from nilearn.image import get_data
label_desc: Use image node_id 2 for calling a global function with example usage: test_fetch_atlas_source() without return types