code: def _check_list_files_header(lines):
      assert (
          lines[0].rstrip("\r") == "filename | source_id | area_of_use"
      )
      assert (
          lines[1].rstrip("\r") == "----------------------------------"
      )
  
imports: import argparse
  import os
  import subprocess
  import sys
  from glob import glob
  from pathlib import Path
  from unittest.mock import patch
  import pytest
  from pyproj.__main__ import main
  from pyproj.datadir import append_data_dir, get_data_dir, get_user_data_dir
  from pyproj.sync import _load_grid_geojson
  from test.conftest import grids_available, proj_env, tmp_chdir
label_desc: Use image node_id 4 for calling a global function with example usage: _check_list_files_header(lines) without return types