code: def test_read_annotation_txt_empty(tmp_path):
      """Test empty TXT input/output."""
      content = "# MNE-Annotations\n" "# onset, duration, description\n"
      fname = tmp_path / "empty-annotations.txt"
      with open(fname, "w") as f:
          f.write(content)
      annot = read_annotations(fname)
      _assert_annotations_equal(annot, Annotations([], [], []))
  
imports: import sys
  from collections import OrderedDict
  from datetime import datetime, timedelta, timezone
  from itertools import repeat
  from pathlib import Path
  import numpy
  import pytest
  from numpy.testing import assert_allclose, assert_array_almost_equal, assert_array_equal, assert_equal
  from pytest import approx
  import mne
  from mne import Annotations, Epochs, annotations_from_events, count_annotations, create_info, events_from_annotations, read_annotations
  from mne.annotations import _handle_meas_date, _read_annotations_txt_parse_header, _sync_onset
  from mne.datasets import testing
  from mne.io import RawArray, concatenate_raws, read_raw_fif
  from mne.utils import _dt_to_stamp, _raw_annot, _record_warnings, _stamp_to_dt, assert_and_remove_boundary_annot, catch_logging, check_version
label_desc: Use image node_id 31 for calling a global function with example usage: test_read_annotation_txt_empty(tmp_path) without return types