code: def testZero(self):
      signal = zeros(256)
      pitch, confidence = PitchMelodia()(signal)
      self.assertAlmostEqualVector(pitch, [0.0, 0.0, 0.0])
      self.assertAlmostEqualVector(confidence, [0.0, 0.0, 0.0])
  
label_desc: Use image node_id 1 for calling the TestPitchMelodia obj's underlying member method code with example usage: obj.testZero() without return types