Slippery slope here, we'll be getting political in no time.

Perhaps the French government believes that widespread testing is a good thing, and wants to get as many people tested as possible. It's not just St Martin, it's the same over on St Barth, which suggests that it is nation wide. rt-PCR testing is free, Antigen testing costs. If you're French, bring your national health insurance card, your Carte Vitale. If you're not French, bring your passport.