code: def files(pattern):
      test_files = glob.glob(pattern)
      test_files.sort()
      return test_files
  
imports: import os
  from contextlib import nullcontext
  import warnings
  import glob
  import numpy
  import scipy.io
  import scipy.signal
  from typing import Any, ContextManager
  import pytest
  import librosa
label_desc: Use image node_id 1 for calling a global function with example usage: files(pattern) and returns: test_files