code: def testZero(self):
      inputSize = 2**11
      signalZero = [0] * inputSize
      output = np.abs(np.mean(self.initNsgconstantq()(signalZero)[0]))
      self.assertEqual(0, output)
  
file_path: essentia/test/src/unittests/standard/test_nsgconstantq.py
imports: from essentia_test import *
  import numpy
label_desc: Use image node_id 5 for calling the TestNSGConstantQ obj's underlying member method code with example usage: obj.testZero() without return types