This week's book giveaway is in the NodeJS forum. We're giving away four copies of Serverless Applications with Node.js and have Slobodan Stojanovic & Aleksandar Simovic on-line! See this thread for details.
Take a look at CruiseControl. It has a relatively high code coverage and has had a lot of different authors contributing to the codebase, possibly giving a more "broad" perspective on how people write JUnit tests.