Why do edge cases still slip past me when I test robots?
You test the robot. It works, again and again. Then something you never imagined happens, and it fails. You feel like you should have caught it — like you were not careful enough. You were careful enough. That is not the problem. No mind can imagine every edge case by trying harder to imagine it. The person who built the system cannot see past the edges of what they built. This is not a weakness in you. It is a limit of thinking alone. The fix is not more attention. It is a different method — one that finds what your attention cannot.
You will not catch rare failures by being more careful. Carefulness has a ceiling, and you have already hit it. What catches edge cases is a method built to hunt for them on purpose: list the boundaries, test those first, log every failure you ever see. Choose the method. Stop trusting your feeling of thoroughness.
What changes unlock by starting
- You build a written list of edge cases, not a memory of close calls.
- You catch more failures before someone else finds them for you.
- You stop mistaking effort for coverage.
- You trust your testing because it is written down, not because you feel confident.