Adam Bien's Weblog
Useful NetBeans Shortcuts--Go to JUnit Test
Use Shift+Cmd+T (or Alt+Cmd+T for current daily builds) to switch between the production class and the related unit test.
If it doesn't work, you probably forgot to write a test (it happens sometimes :-))
NEW workshop: Java EE 7 Testing, Deployment, Automation and Code Quality: January 28th, 2015, Airport Munich