def METHOD_NAME(levels, severity, has_smearer):
    """Test Cochlea class"""
    audiogram_cfs = np.array([250, 500, 2000])
    audiogram = Audiogram(levels=levels, frequencies=audiogram_cfs)
    assert audiogram.severity == severity
    cochlea = Cochlea(audiogram=audiogram)
    assert (cochlea.smearer is not None) == has_smearer