code: def testZero(self):
      speaks = SpectralPeaks()
      (freqs, mags) = speaks(numpy.zeros(1024, dtype="f4"))
      self.assert_(len(freqs) == 0)
      self.assert_(len(mags) == 0)
  
file_path: essentia/test/src/unittests/spectral/test_spectrumtocent.py
imports: from essentia_test import *
label_desc: Use image node_id 2 for calling the TestSpectrumToCent obj's underlying member method code with example usage: obj.testZero() without return types