code: def test_base_transformer():
      D = muda.BaseTransformer()
  
      six.next(D.transform(jam_fixture))
  
imports: from copy import deepcopy
  import re
  import six
  import numpy
  import soundfile
  import jams
  import librosa
  import muda
  import pytest
  import scipy
  from contextlib import contextmanager
label_desc: Use image node_id 45 for calling a global function with example usage: test_base_transformer() without return types