code: def test_eyetrack_not_data_ch():
      """Eyetrack channels are not data channels."""
      msg = (
          "eyetrack channels are not data channels. Refer to MNE definition"
          " of data channels in the glossary section of the documentation."
      )
      assert "eyegaze" not in _DATA_CH_TYPES_SPLIT, msg
      assert "pupil" not in _DATA_CH_TYPES_SPLIT, msg
  
file_path: mne-python/mne/io/eyelink/tests/test_eyelink.py
imports: from pathlib import Path
  import numpy
  import pytest
  from numpy.testing import assert_allclose
  from mne._fiff.constants import FIFF
  from mne._fiff.pick import _DATA_CH_TYPES_SPLIT
  from mne.datasets.testing import data_path, requires_testing_data
  from mne.io import read_raw_eyelink
  from mne.io.eyelink._utils import _adjust_times, _find_overlaps
  from mne.io.tests.test_raw import _test_raw_reader
label_desc: Use image node_id 1 for calling a global function with example usage: test_eyetrack_not_data_ch() without return types