We have decided not to go to Austria and Slovenia but instead will stay in Germany from where we are flying back to Switzerland in about a couple of weeks.
We might go from there to Sweden as well as to Northern Portugal, all depending on the situation to make sure we are not entering any high risk area during our time here.

With this in mind, we are not going to a test at this time and rather just go and stay in places which allow us to do so without major disruptions or worries like you mentioned above which somehow doesn't make sense but it's obviously the countries rules and regulations which we have to abide by.

I do wonder what they would do with someone who is already in the country, did not come from a high risk area but test positive. Where would they want the person to go and stay? Some countries have specific hotels where people can go to for quarantine and I can understand that it would be a big concern for any hotel accepting a positive case to wait out their 10 day quarantine there.