code: def test_read_evoked_besa(fname):
      """Test reading MESA .avr and .mul files."""
      ev = read_evoked_besa(fname)
      assert len(ev.ch_names) == len(ev.data) == 33
      assert ev.info["sfreq"] == 200
      assert ev.tmin == -0.1
      assert len(ev.times) == 200
      assert ev.ch_names == montage.ch_names
      assert ev.comment == "simulation"
  
imports: import inspect
  from pathlib import Path
  import pytest
  from mne.channels import read_custom_montage
  from mne.io import read_evoked_besa
label_desc: Use image node_id 1 for calling a global function with example usage: test_read_evoked_besa(fname) without return types