code: def testZero(self):
      pitch, confidence = PitchYin()(zeros(2048))
      self.assertEqual(pitch, 0)
      self.assertEqual(confidence, 0)
  
file_path: essentia/test/src/unittests/tonal/test_pitchyin.py
imports: from essentia_test import *
  from numpy import sin, pi, mean, random
label_desc: Use image node_id 2 for calling the TestPitchYin obj's underlying member method code with example usage: obj.testZero() without return types