code: def test_morph_source_spaces():
      """Test morphing of source spaces."""
      pytest.importorskip("nibabel")
      src = read_source_spaces(fname_fs)
      src_morph = read_source_spaces(fname_morph)
      src_morph_py = morph_source_spaces(
          src, "sample", subjects_dir=subjects_dir
      )
      _compare_source_spaces(src_morph, src_morph_py, mode="approx")
  
imports: from pathlib import Path
  from shutil import copytree
  import numpy
  import pytest
  from numpy.testing import assert_allclose, assert_array_equal, assert_array_less, assert_equal
  import mne
  from mne import SourceEstimate, add_source_space_distances, compute_source_morph, get_volume_labels_from_src, make_sphere_model, morph_source_spaces, pick_types, read_bem_solution, read_bem_surfaces, read_freesurfer_lut, read_source_spaces, read_trans, setup_source_space, setup_volume_source_space, write_source_spaces
  from mne._fiff.constants import FIFF
  from mne._fiff.pick import _picks_to_idx
  from mne.datasets import testing
  from mne.fixes import _get_img_fdata
  from mne.source_estimate import _get_src_type
  from mne.source_space import compute_distance_to_sensors, get_decimated_surfaces
  from mne.source_space._source_space import _compare_source_spaces
  from mne.surface import _accumulate_normals, _triangle_neighbors
  from mne.utils import _record_warnings, requires_mne, run_subprocess
label_desc: Use image node_id 20 for calling a global function with example usage: test_morph_source_spaces() without return types