Yeah, just brute‑force it. Pull the input space, partition it into logical ranges, then push the boundaries. For each feature, flip bits, use min/max, or add one beyond the typical value. Automate that with a test harness that feeds every combination of edge values into a dummy trainer and watches for failures. That way you catch the “break on a simple edge case” before you even write a single epoch. It’s a bit mechanical, but it keeps the bugs from creeping in.