AI didn't save $500k. A test suite did.

Behind every successful AI rewrite story, there is an unsung hero. And it's never the AI. Chances are you've already come across the Reco story. Their AI tool rewrote JSONata from JavaScript to Go in a day or so. The end result? Half a million dollars per year less on infra costs. Insane. Blog gold. Yet, I can't stop ruminating on the part no one really shared. The real MVP wasn't the model JSONata had an existing test suite. A good one. The type of test suite someone spent years working on, tes