[Rails] I want to be clear about RSpec.

A while back, someone wrote something I found very insightful and
useful, to the effect of: don't think of Cucumber as a *testing* tool,
but rather a *collaboration* tool. Having tested many projects with
and without it, I've formed my opinion:

If you have a non-technical stakeholder who wants to get involved in
reading, and maybe even writing, the actual tests themselves (not a
summary, report, translation, etc.), then Cucumber is an excellent
tool to let them do so, at the top layer (don't let them at the step
definitions!). However, in the *other* 99.999% of cases, it's just
not worth the hassles.
RSpec tests are often also .rb files. Or do you mean test-code versus
production-code? That's a whole 'nother argument, bringing up
Test-First vs. TDD vs. BDD vs. ATDD. It's enough to give you ADD!

-Dave