Maybe create some kind of (semi-) automated test system

Since I'm not familiar with JUnit or similar and it does not work that well with Minecraft anyway, this is a some kind of ingame test which is executed via command.

As expected it is quite hard to create something like this for MC.
But besides JUnit and Mockito I've found a JUnit suite which might be helpful here.
https://github.com/MyEssentials/MyEssentials-TestSuite

Still have to figure out what exactly I can test and if it is worth the trouble