code: def testZero(self):
      inputSize = 2**15
      signalZero = [0] * inputSize
      output = numpy.mean(numpy.abs(SpectrumCQ()(signalZero)))
      self.assertEqual(0, output)
  
file_path: essentia/test/src/unittests/standard/test_spectrumcq.py
imports: from essentia_test import *
label_desc: Use image node_id 3 for calling the TestSpectrumCQ obj's underlying member method code with example usage: obj.testZero() without return types