code: def test_valid_stereo_or_mono():
      """valid_audio: mono=False, y.ndim==1"""
      y = np.zeros(1000)
      librosa.util.valid_audio(y, mono=False)
  
imports: import os
  import numpy
  import librosa
  import pytest
label_desc: Use image node_id 4 for calling a global function with example usage: test_valid_stereo_or_mono() without return types