JUnit is the unit testing framework that really started it all and has a great number of mature features and add-on projects. One such project is Robotium which enabled wonderful black box testing of your Android application:
You can even control it with the very friendly Selenium Remote-Control:
While I was searching Twitter for real-time updates to these subjects that I could include in this blog, I found a reference to RoboGuice which is an Android DI / IOC container. I did not know it existed, but I do like Guice:
Perhaps something to look at for an upcoming complex application ...