def METHOD_NAME(frame):
    RPP5.enth_mol_ig_comp.build_parameters(frame.params)
    assert isinstance(frame.params.enth_mol_form_vap_comp_ref, Var)
    assert value(frame.params.enth_mol_form_vap_comp_ref) == -241.81e3
    expr = RPP5.enth_mol_ig_comp.return_expression(
        frame.props[1], frame.params, frame.props[1].temperature
    )
    assert value(expr) == pytest.approx(-240973.683, abs=1e-3)
    frame.props[1].temperature.value = 400
    assert value(expr) == pytest.approx(-237521.691, abs=1e-3)
    assert_units_equivalent(expr, pyunits.J / pyunits.mol)