code: def test_make_forward_solution_kit(tmp_path, fname_src_small):
      """Test making fwd using KIT (compensated) files."""
      sqd_path = kit_dir / "test.sqd"
      mrk_path = kit_dir / "test_mrk.sqd"
      elp_path = kit_dir / "test_elp.txt"
      hsp_path = kit_dir / "test_hsp.txt"
      fname_kit_raw = kit_dir / "test_bin_raw.fif"
  
      # first use mne-C: convert file, make forward solution
      fwd = _do_forward_solution(
          "sample",
          fname_kit_raw,
          src=fname_src_small,
          bem=fname_bem_meg,
          mri=trans_path,
          eeg=False,
          meg=True,
          subjects_dir=subjects_dir,
      )
      assert isinstance(fwd, Forward)
  
      # now let's use python with the same raw file
      src = read_source_spaces(fname_src_small)
      fwd_py = make_forward_solution(
          fname_kit_raw,
          trans_path,
          src,
          fname_bem_meg,
          eeg=False,
          meg=True,
      )
      _compare_forwards(fwd, fwd_py, 157, n_src_small)
      assert isinstance(fwd_py, Forward)
  
      # now let's use mne-python all the way
      raw_py = read_raw_kit(sqd_path, mrk_path, elp_path, hsp_path)
      # without ignore_ref=True, this should throw an error:
      with pytest.raises(
          NotImplementedError, match="Cannot.*KIT reference"
      ):
          make_forward_solution(
              raw_py.info,
              src=src,
              eeg=False,
              meg=True,
              bem=fname_bem_meg,
              trans=trans_path,
          )
  
      # check that asking for eeg channels (even if they don't exist) is handled
      meg_only_info = pick_info(
          raw_py.info, pick_types(raw_py.info, meg=True, eeg=False)
      )
      fwd_py = make_forward_solution(
          meg_only_info,
          src=src,
          meg=True,
          eeg=True,
          bem=fname_bem_meg,
          trans=trans_path,
          ignore_ref=True,
      )
      _compare_forwards(
          fwd, fwd_py, 157, n_src_small, meg_rtol=1e-3, meg_atol=1e-7
      )
  
imports: from itertools import product
  from pathlib import Path
  import numpy
  import pytest
  from numpy.testing import assert_allclose, assert_array_equal, assert_array_less
  from mne import convert_forward_solution, create_info, get_volume_labels_from_aseg, make_forward_solution, make_sphere_model, pick_info, pick_types, pick_types_forward, read_cov, read_dipole, read_evokeds, read_forward_solution, read_source_spaces, setup_volume_source_space, write_forward_solution
  from mne._fiff.constants import FIFF
  from mne.bem import make_bem_solution, read_bem_surfaces
  from mne.channels import make_standard_montage
  from mne.datasets import testing
  from mne.dipole import Dipole, fit_dipole
  from mne.forward import Forward, _do_forward_solution, use_coil_def
  from mne.forward._compute_forward import _magnetic_dipole_field_vec
  from mne.forward._make_forward import _create_meg_coils, make_forward_dipole
  from mne.forward.tests.test_forward import assert_forward_allclose
  from mne.io import read_info, read_raw_bti, read_raw_fif, read_raw_kit
  from mne.simulation import simulate_evoked
  from mne.source_estimate import VolSourceEstimate
  from mne.source_space._source_space import _compare_source_spaces, setup_source_space, write_source_spaces
  from mne.surface import _get_ico_surface
  from mne.transforms import Transform
  from mne.utils import catch_logging, requires_mne, requires_mne_mark, requires_openmeeg_mark, run_subprocess
label_desc: Use image node_id 5 for calling a global function with example usage: test_make_forward_solution_kit(tmp_path, fname_src_small) without return types