def METHOD_NAME(self):
    f0 = 0
    freqs = [0, 110, 220]
    mags = [1, 0, 0]
    hfreqs, hmags = HarmonicPeaks()(freqs, mags, f0)
    self.assertEqualVector(hfreqs, [])
    self.assertEqualVector(hmags, [])
    f0 = 20
    freqs = [0, 40, 80]
    mags = [1, 0, 0]
    self.assertComputeFails(HarmonicPeaks(), freqs, mags, f0)