CapeDwarf is pretty stable since its initial version 2.x.

The GAE API didn't change much, if at all.

And meanwhile we added a bunch of new tests via GAE TCK: http://www.appengine-tck.org/

Which we daily run against latest CapeDwarf codebase: https://github.com/capedwarf/capedwarf-testsuite

I'll probably cut a new release next week -- 2.0.0.CR5, with some minor fixes and some new features (GAE-like http session handling, warmup request).

As such, these CRs are pretty much like Final -- only minor changes are applied.