The states of France and the Czech Republic have changed their entry requirements. The neighboring countries of Austria and Germany are largely sealed off again and only want to allow access in exceptional cases. However, you only want to check on a random basis.
France forbids entering the national territory if you want to come from a non-EU country. There are also some exceptions here, because, for example, people residing in France and transfer passengers who formally do not enter the country, but only change aircraft, are not affected. Coming from EU areas, a negative corona test must be presented.