def METHOD_NAME(self):
    per = burnman.minerals.SLB_2011.periclase()
    stv = burnman.minerals.SLB_2011.stishovite()
    dE = -15000.0
    made_bdg = CombinedMineral(
        [
            burnman.minerals.SLB_2011.periclase(),
            burnman.minerals.SLB_2011.stishovite(),
        ],
        [1.0, 1.0],
        [dE, 0.0, 0.0],
    )
    per.set_state(1.0e5, 1000.0)
    stv.set_state(1.0e5, 1000.0)
    made_bdg.set_state(1.0e5, 1000.0)
    self.assertFloatEqual(made_bdg.V, per.V + stv.V)