code: def test_valid_stereo():
      """valid_audio: mono=False, y.ndim==2"""
      y = np.zeros((1000, 2)).T
      librosa.util.valid_audio(y, mono=False)
  
imports: import os
  import numpy
  import librosa
  import pytest
label_desc: Use image node_id 6 for calling a global function with example usage: test_valid_stereo() without return types