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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.