code: def testZero(self):
      # Inputting zeros should return null band energies
      nbands = [0, 100, 200, 300]
      fband = FrequencyBands(frequencyBands=nbands)
  
      self.assertEqualVector(fband(zeros(1024)), zeros(len(nbands) - 1))
      self.assertEqualVector(fband(zeros(10)), zeros(len(nbands) - 1))
  
imports: from essentia_test import *
label_desc: Use image node_id 2 for calling the TestFrequencyBands obj's underlying member method code with example usage: obj.testZero() without return types