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I understand what you're proposing, but I'm backtracking a little. 
(my kingdom for you and a whiteboard in the same room :)

I think that you could have a hybrid of your
db.do_something("desired_return_value")
and 
self.stubs.Set(nova.db, 'instance_get_by_uuid', fake_instance_get)
(which I don't think is terrible other than requiring a nested method)

to produce: 
self.sorens_mox.Set(nova.db, 'instance_get_by_uuid', {'name': 'this or that',
                'instance_type_id': 42})

which would work with things other than just the db.



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> So, you've made a much better StubOutWithMock() and slightly better stubs.Set() by (essentially) ignoring the method parameter checks and just focusing on the return type.

No, no. Read my e-mail again. I don't want to do it that way either. I
showed two examples of what I'd like to get rid of, followed by what I'd
like to do instead.