How Not To Be Caught Flat-footed With Unpredictable FME Results

Have you ever burned the midnight oil trying to track down and fix a misbehaving workspace after it's trashed your production database thanks to some bizarrely errant input data you never anticipated? If so, take a leaf from the software engineering book and use a test framework with your workspaces as you build them (or after, if they already exist). I'll briefly summarize effective usage of the relevant freely-available transformers I've published on the FME Hub.