I'm not sure if you're talking about the pain of going back to testing ruby / rails after using mocha / node, but I feel that specific pain, especially on projects with old-school Rails purists who insist on Test::Unit style. Switching to rspec gives you nested describe blocks with shared setup and teardown steps, as nice as mocha. Minitest has this BDD style built in too, but somehow the way Rails ties it in makes it difficult or impossible to take advantage of.