I recently had to get a negative COVID result to travel to Hawaii to see family. Hawaii only accepted tests from a very limited number of providers which complicated things, but after some effort I made an appointment and got a test. The rest of the process was very painless. We all had to keep masks on for the entire flight of course since there was no requirement that we all have a negative result before getting on the flight but it was comforting to know that nearly everyone else on the flight would have had a negative result so as to avoid the mandatory 14 day quarantine upon arrival.
If you enter Mauritius you have to get four tests in total over several weeks. Islands are taking advantage of their isolation to get this pandemic under control.
Madeira has been very successful during all of 2020 with not letting it escalate.