(AKA ddescribe/iit) (AKA exclusive tests)
you can easily put "puts" in various places, since it won't dump a bunch of garbage to the screen since it's focused
Noel Rappin says they're good when doing TDD, but the types of tests you do with them might not be good testing-concept-long-lasting-regression-tests
Called this by Noel Rappin here podcast-rr-185-rails-4-test-prescriptions-with-noel-rappin
On JavaScript Jabber, Toby Ho (the Test'em guy) talks about flow and using "exclusive tests", (his name for them) to stay in the editor.
"I recently switched over to Mocha, I guess mainly because of the .only feature, which I like."