code: def test_mode_to_key_no_change(mode, ref_mode):
      simplified_mode = librosa.core.notation.__mode_to_key(mode)
      for n, rn in zip(mode, ref_mode):
          assert n == rn
  
imports: import os
  import sys
  import warnings
  import numpy
  import pytest
  import librosa
label_desc: Use image node_id 12 for calling a global function with example usage: test_mode_to_key_no_change(mode, ref_mode) without return types