def METHOD_NAME(opt):
    with DimensionalAnalysis():
        # Arrange
        si = constants_defaults.si
        T = 300 * si.kelvins
        formulae = Formulae(latent_heat=opt)
        sut = formulae.latent_heat.lv
        # Act
        lv = sut(T)
        # Assert
        assert lv.check("[energy]/[mass]")