[adamors]

Correct me if I'm wrong, but one of the points of using dummy persistence is testing. You can delay using a database for a long time this way, have tests that finish quickly etc. Doing this within the confines of a Rails like MVC is next to impossible.

[ubernostrum]

I am also a strong non-fan of faking persistence mechanisms in testing. If you're faking it, you don't actually know that the real thing will work.

[adamors]

That's what functional tests are for. But if you're doing TDD there's no point in constantly running your functional/acceptance tests.

[ubernostrum]

Anything that's not full verification isn't verification at all :)