Custom uses-library for our own system app

Question

Hi,

I need to make a system library (will be embedded in the system image on some phones). It needs to be used with the "uses-library" feature. (just like Sprint created such a system library for their Evo 4G front-facing camera support)

My question is: - How can I create such a project? (I'll need to create a stub to link against and the full lib itself) - How can I test it? (is it possible to test without making it a system app, or do I need to make it a system app also for testing)

Thanks for any hints.