What does this have to do with Junit?

Junit was one of the first libraries to popularise modern patterns of unit testing.

Some people were writing their own ad-hoc scaffolds before that but it wasn't a widespread practice. Testing meant manual testers clicking on things in the UI, and sophisticated testing was if you had checklists of things to test manually.

My apologies for that. I always forget I am old ;). What Macha said.