code: def test_deemphasis_multi(y_multi):
      y, sr = y_multi
  
      # compare each channel
      C0, zf0 = librosa.effects.deemphasis(y[0], return_zf=True)
      C1, zf1 = librosa.effects.deemphasis(y[1], return_zf=True)
      Call, zf = librosa.effects.deemphasis(y, return_zf=True)
  
      # Check each channel
      assert np.allclose(C0, Call[0])
      assert np.allclose(C1, Call[1])
      assert np.allclose(zf0, zf[0])
      assert np.allclose(zf1, zf[1])
  
      # Verify that they're not all the same
      assert not np.allclose(Call[0], Call[1])
      assert not np.allclose(zf[0], zf[1])
  
imports: import warnings
  import os
  from contextlib import nullcontext
  import numpy
  import pytest
  import librosa
label_desc: Use image node_id 23 for calling a global function with example usage: test_deemphasis_multi(y_multi) without return types