People were doing TDD for sure (at least I can tell so in .Net and Java) before Rails was released. IMO though, Rails moved this from "something done by advanc

People were doing TDD for sure (at least I can tell so in .Net and Java) before Rails was released. IMO though, Rails moved this from "something done by advanced programmers" to "something done most of the time". The most brilliant contribution for me was: the migrations.