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Ok, this seems like a good time to repeat what I posted to nova-database
the other day.

tl;dr: I'm adding a fake DB driver as well as a DB test suite that we
can run against any of the backends to verify that they act the same.
This should address all the concerns I've heard so far.

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Hi.

I just want to let you know that I'm working on a fake DB driver. The
two primary goals are to reduce the time it takes to run the test
suite (my results so far are very impressive) and simply to have
another, independent DB implementation. Once I'm done, I'll start
adding tests for it all, and finally, I'll take a stab at adding an
alternative, real DB backend.

In case you're wondering why I don't write the tests first, it's
simply because I don't know how all these things are supposed to work.
I hope to have a much better understanding of this once I've written
the fake DB driver, and then I'll add a generic test suite that should
be able to validate any DB backend.
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-- 
Soren Hansen        | http://linux2go.dk/
Ubuntu Developer    | http://www.ubuntu.com/
OpenStack Developer | http://www.openstack.org/