I like this article, however, I would emphasise that there is a balance that must be struck between writing mini-DSL/fixture generating code v.s. writing simple

I like this article, however, I would emphasise that there is a balance that must be struck between writing mini-DSL/fixture generating code v.s. writing simple data structures (e.g. Object literals that mimic JSON). Its a good thing to take extra care writing the generating code, as any brittleness is passed onto dependent tests.