Test your tests by having a tool break your code!

A fun way of testing your code is having a tool called Jester break it and then run your tests to check if there are failures. If no failures occur then there is a big chance that your tests are not completely covering your code. Another way to check your test coverage is Clover, but that’s far less fun.


IBM has an article about Jester: Test your tests with Jester 
And here you find Jester its homepage: Jester, the JUnit tester