code: def test_wrong_buf_size(self):
      with self.assertRaises(ValueError):
          mfcc(buf_size=-1)
  
imports: from _tools import parametrize, assert_raises
  from numpy import random, count_nonzero
  from numpy.testing import TestCase
  from aubio import mfcc, cvec, float_type
label_desc: Use image node_id 1 for calling the aubio_mfcc_wrong_params obj's underlying member method code with example usage: obj.test_wrong_buf_size() without return types