Craig Walls once more gives Pax Tools a great review:http://java.dzone.com/articles/dozen-osgi-myths-and
There's also a huge set of OSGi tools available from the OPS4J Pax project. I've already reviewed these tools on this blog, so I won't go into it again here. Suffice it to say that many of the Pax tools have become indispensable in my OSGi development toolbox. I'm particularly fond of Pax Construct, Pax Runner, Pax Exam, and Pax URL. You can count on me blogging more about the Pax tools soon.
Of the three testing frameworks listed, I tend to favor Pax Exam because it's currently the only one that is based on JUnit 4. Pax Drone is effectively deprecated in favor of Pax Exam, so unless you encounter a project that's already using it, you should disregard it. As for Spring-DM's testing support, it is nice in that it uses Spring autowiring to autowire OSGi services into a test class. But until it's based on JUnit 4, I still prefer Pax Exam.
