It’s worth pointing out that if they bring in 2G+ the fact that you’ll need tests shouldn’t be a disincentive to coming. There are test centres all over the place - I can think of 3 within 5-10 minutes walk of my flat - so getting hold of a test would be easy if you need to do one. They’re free for German residents, I’m not sure the rules for non-residents. But if you had to pay for one I reckon worst case would be about €10.