Testing is the most important activity in the development process. If you don’t test, how do you know that your code actually works correctly? And if you don’t have tests, how do you know you don’t break something? JRuby makes it possible to test Ruby code – but also to apply Ruby testing frameworks to Java code. This session will take a look at the current state of the start in JRuby testing, looking at how well the different frameworks work, and what you need to do to take your Java testing to the next century.