def METHOD_NAME(self, model):
    # Fix state
    # Note that flow of D cannot be specified due to equlibrium
    model.props[1].flow_mol_comp["A"].fix(1)
    model.props[1].flow_mol_comp["B"].fix(1)
    model.props[1].flow_mol_comp["C"].fix(1)
    model.props[1].temperature.fix(368)
    model.props[1].pressure.fix(101325)
    assert degrees_of_freedom(model) == 0