code: def test_unknown(self):
      with self.assertRaises(RuntimeError):
          specdesc("unknown", 512)
  
imports: from numpy.testing import TestCase, assert_equal, assert_almost_equal
  from numpy import random, arange, log, zeros
  from aubio import specdesc, cvec, float_type
label_desc: Use image node_id 2 for calling the aubio_specdesc_wrong obj's underlying member method code with example usage: obj.test_unknown() without return types