code: def test_channel_order(fname, want_order):
      """Test that logical channel order is preserved."""
      raw = read_raw_nirx(fname)
      ch_names = raw.ch_names
      prefixes = [ch_name.split()[0] for ch_name in ch_names]
      assert prefixes[::2] == prefixes[1::2]
      prefixes = prefixes[::2]
      assert prefixes == want_order
  
imports: import datetime
  import os
  import shutil
  import numpy
  import pytest
  from numpy.testing import assert_allclose, assert_array_equal
  from mne import pick_types
  from mne._fiff.constants import FIFF
  from mne.datasets.testing import data_path, requires_testing_data
  from mne.io import read_raw_nirx
  from mne.io.tests.test_raw import _test_raw_reader
  from mne.preprocessing import annotate_nan
  from mne.preprocessing.nirs import _reorder_nirx, short_channels, source_detector_distances
  from mne.transforms import _get_trans, apply_trans
label_desc: Use image node_id 17 for calling a global function with example usage: test_channel_order(fname, want_order) without return types