Android apps fail for a number of reasons other than simple logic errors. At its most basic the app may not install correctly, or there may be a problem when you move from landscape to portrait and back again.
Last week we had a meeting where the interns talked about what they did over the summer. And while I was listening to them talk it occurred to me that it would be a good idea to share this with a larger audience for a number of reasons.
JUnit on its own may be all you need but there are a number of excellent third party tools that you can bolt onto JUnit that really make your Android testing shine.