def METHOD_NAME(self, model):
    assert isinstance(model.fs.unit.outlet.flow_mass_comp, Var)
    for (t, j) in model.fs.unit.outlet.flow_mass_comp.keys():
        assert t == 0
        assert j in model.db.get_solute_set() or j == "H2O"
    assert isinstance(model.fs.unit.flow_vol, Var)
    assert len(model.fs.unit.flow_vol) == 1
    assert isinstance(model.fs.unit.conc_mass_comp, Var)
    for (t, j) in model.fs.unit.conc_mass_comp.keys():
        assert t == 0
        assert j in model.db.get_solute_set()