St George Illawarra and Tongan hooker Siliva Havili isn't treating Saturday afternoon's Pacific Tests as its billed 'invitational' status suggests.

Havili believes the Tongan's hit out against the Fiji Bati will prove a good litmus test ahead of the Rugby League World Cup at year's end.

Fiji – who have made the semi-finals in the previous two World Cups – present a huge challenge for the Tongans considering they're ranked 14th currently.