code: def test_hop_size_negative(self):
      win_s = 512
      hop_s = -2
      with self.assertRaises(ValueError):
          pvoc(win_s, hop_s)
  
imports: from numpy.testing import TestCase, assert_equal, assert_array_less
  from _tools import parametrize, skipTest
  from aubio import fvec, cvec, pvoc, float_type
  import numpy
label_desc: Use image node_id 3 for calling the aubio_pvoc_wrong_params obj's underlying member method code with example usage: obj.test_hop_size_negative() without return types