code: def test_plot_head_positions():
      """Test plotting of head positions."""
      info = read_info(evoked_fname)
      pos = np.random.RandomState(0).randn(4, 10)
      pos[:, 0] = np.arange(len(pos))
      destination = (0.0, 0.0, 0.04)
      with _record_warnings():  # old MPL will cause a warning
          plot_head_positions(pos)
          plot_head_positions(
              pos, mode="field", info=info, destination=destination
          )
          plot_head_positions([pos, pos])  # list support
          pytest.raises(ValueError, plot_head_positions, ["pos"])
          pytest.raises(ValueError, plot_head_positions, pos[:, :9])
      pytest.raises(ValueError, plot_head_positions, pos, "foo")
      with pytest.raises(ValueError, match="shape"):
          plot_head_positions(pos, axes=1.0)
  
imports: from pathlib import Path
  import matplotlib.pyplot
  import numpy
  import pytest
  from matplotlib.colors import Colormap
  from matplotlib.figure import Figure
  from numpy.testing import assert_allclose, assert_array_equal
  from mne import MixedSourceEstimate, SourceEstimate, convert_forward_solution, make_field_map, make_sphere_model, pick_info, pick_types, read_dipole, read_evokeds, read_forward_solution, read_trans, setup_volume_source_space, use_coil_def
  from mne._fiff._digitization import write_dig
  from mne._fiff.constants import FIFF
  from mne.bem import read_bem_solution, read_bem_surfaces
  from mne.datasets import testing
  from mne.defaults import DEFAULTS
  from mne.io import read_info, read_raw_bti, read_raw_ctf, read_raw_kit, read_raw_nirx
  from mne.minimum_norm import apply_inverse
  from mne.source_estimate import _BaseVolSourceEstimate
  from mne.source_space import read_source_spaces
  from mne.transforms import Transform
  from mne.utils import _record_warnings, catch_logging
  from mne.viz import Brain, EvokedField, Figure3D, link_brains, mne_analyze_colormap, plot_alignment, plot_brain_colorbar, plot_head_positions, plot_source_estimates, plot_sparse_source_estimates, snapshot_brain_montage
  from mne.viz._3d import _get_map_ticks, _linearize_map, _process_clim
  from mne.viz.utils import _fake_click, _fake_keypress, _fake_scroll, _get_cmap
label_desc: Use image node_id 1 for calling a global function with example usage: test_plot_head_positions() without return types