code: def test_pitch_shift_multi(y_multi):
      y, sr = y_multi
  
      # compare each channel
      C0 = librosa.effects.pitch_shift(y[0], sr=sr, n_steps=1)
      C1 = librosa.effects.pitch_shift(y[1], sr=sr, n_steps=1)
      Call = librosa.effects.pitch_shift(y, sr=sr, n_steps=1)
  
      # Check each channel
      assert np.allclose(C0, Call[0])
      assert np.allclose(C1, Call[1])
  
      # Verify that they're not all the same
      assert not np.allclose(Call[0], Call[1])
  
imports: import warnings
  import os
  from contextlib import nullcontext
  import numpy
  import pytest
  import librosa
label_desc: Use image node_id 6 for calling a global function with example usage: test_pitch_shift_multi(y_multi) without return types