code: def test_label_io(tmp_path):
      """Test IO of label files."""
      label = read_label(label_fname)
  
      # label attributes
      assert_equal(label.name, "test-lh")
      assert label.subject is None
      assert label.color is None
  
      # save and reload
      label.save(tmp_path / "foo")
      label2 = read_label(tmp_path / "foo-lh.label")
      assert_labels_equal(label, label2)
  
      # pickling
      dest = tmp_path / "foo.pickled"
      with open(dest, "wb") as fid:
          pickle.dump(label, fid, pickle.HIGHEST_PROTOCOL)
      with open(dest, "rb") as fid:
          label2 = pickle.load(fid)  # nosec B301
      assert_labels_equal(label, label2)
  
imports: import glob
  import os
  import pickle
  import shutil
  from itertools import product
  from pathlib import Path
  import numpy
  import pytest
  from numpy.testing import assert_allclose, assert_array_almost_equal, assert_array_equal, assert_array_less, assert_equal
  from scipy import sparse
  from mne import grow_labels, labels_to_stc, morph_labels, random_parcellation, read_label, read_labels_from_annot, read_source_estimate, read_source_spaces, read_surface, spatial_tris_adjacency, split_label, stc_to_label, write_labels_to_annot
  from mne.datasets import testing
  from mne.label import Label, _blend_colors, _load_vert_pos, _n_colors, _read_annot, _read_annot_cands, label_sign_flip, select_sources
  from mne.source_estimate import mesh_edges
  from mne.source_space import SourceSpaces
  from mne.surface import _mesh_borders
  from mne.utils import _record_warnings, get_subjects_dir
label_desc: Use image node_id 8 for calling a global function with example usage: test_label_io(tmp_path) without return types