code: def test_mel_gap():
      # This configuration should trigger some empty filters
      sr = 44100
      n_fft = 1024
      fmin = 0
      fmax = 2000
      n_mels = 128
      htk = True
  
      with pytest.warns(UserWarning, match="Empty filters"):
          librosa.filters.mel(
              sr=sr,
              n_fft=n_fft,
              n_mels=n_mels,
              fmin=fmin,
              fmax=fmax,
              htk=htk,
          )
  
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 10 for calling a global function with example usage: test_mel_gap() without return types