code: def testEmpty(self):
      freqs = []
      f0 = 110
      mags = []
  
      hfreqs, hmags = HarmonicPeaks()(freqs, mags, f0)
      self.assertEqualVector(hfreqs, [])
      self.assertEqualVector(hmags, [])
  
file_path: essentia/test/src/unittests/tonal/test_harmonicpeaks.py
imports: from essentia_test import *
label_desc: Use image node_id 6 for calling the TestHarmonicPeaks obj's underlying member method code with example usage: obj.testEmpty() without return types