What is the openHAB test framework?

Development Misc
1

I’m trying to make a small contribution following openHAB’s contribution guide, but I can’t find details about the “great test framework built in” mentioned there. Can someone guide me please?

2

Each package whose name ends with “.test” here is a set of tests using the JUnit test framework.

3

Thanks for your reply. For some reason, I had expected something else, but that totally makes sense.