I hold a scientific visa for France (I am not European). Do I need some kind of health insurance to enter the country?

According to the *convention d'accueil*, the hosting institution is willing to take care of my health insurance. However, I am still in doubt because the contract starts two days after I plan to enter to France. The visa is issued valid from three days before the contract starts, so it will be valid when I intend to enter the country.

Edit: the only official thing I found regarding verification upon arrival is [this](https://www.diplomatie.gouv.fr/en/coming-to-france/getting-a-visa/article/verification-upon-arrival-in). They do not ask explicitly for a health insurance, anyway, my visa would be exempted as it is labeled with a visa endorsement. Now I wonder if the health insurance is regulated in another place.