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on Thu Jan 19 2012, Mathieu Champlon
As for the state of both libraries today, I would say the HippoMocks documentation is a bit sparse and the user/reference manual is lacking, but the tutorial might be enough to get users started. I believe Turtle has a slightly better integration with Boost.Test, is a bit more customizable (error policy, constraint logging, ...) and seems a more user friendly with compilation errors. Also Hippomocks doesn't seem to have been updated later than Dec 2010 but it might be that it's stable enough (although the git repository contains interesting unreleased features I haven't been able to make work, such as mocking a free function).
I hope this helps,
Thanks for this very complete rundown! -- Dave Abrahams BoostPro Computing http://www.boostpro.com