code: def test_standard_montages_have_fids(kind):
      """Test standard montage are all in unknown coord (have fids)."""
      montage = make_standard_montage(kind)
      fids, coord_frame = _get_fid_coords(montage.dig)
      for k, v in fids.items():
          assert v is not None, k
      for d in montage.dig:
          if kind.startswith(("artinis", "standard", "mgh")):
              want = FIFF.FIFFV_COORD_MRI
          else:
              want = FIFF.FIFFV_COORD_UNKNOWN
          assert d["coord_frame"] == want
  
file_path: mne-python/mne/channels/tests/test_standard_montage.py
imports: import numpy
  import pytest
  from numpy.testing import assert_allclose, assert_array_almost_equal, assert_raises
  from mne import create_info
  from mne._fiff._digitization import _get_dig_eeg, _get_fid_coords
  from mne._fiff.constants import FIFF
  from mne.channels import compute_native_head_t, make_standard_montage
  from mne.channels.montage import HEAD_SIZE_DEFAULT, get_builtin_montages
  from mne.io import RawArray
  from mne.preprocessing.nirs import beer_lambert_law, optical_density
  from mne.transforms import _angle_between_quats, _get_trans, rot_to_quat
label_desc: Use image node_id 1 for calling a global function with example usage: test_standard_montages_have_fids(kind) without return types