code: def testZero(self):
      beatPeriod = 21168  # N.B The beat period is 21168 samples for 125 bpm @ 44.1k samp. rate
      zeroAudio = zeros(beatPeriod)
      estimate = PercivalBpmEstimator()(zeroAudio)
      self.assertEqual(estimate, 0.0)
  
file_path: essentia/test/src/unittests/rhythm/test_percivalbpmestimator.py
imports: from essentia_test import *
  from essentia.standard import MonoLoader, PercivalBpmEstimator
label_desc: Use image node_id 6 for calling the TestPercivalBpmEstimator obj's underlying member method code with example usage: obj.testZero() without return types