How to Debug a Failing Test with AI (Step-by-Step) A test is red. The error message is vague. You’ve stared at the diff for ten minutes and nothing jumps out. This is exactly where AI earns its keep — not by guessing, but by systematically surfacing the class of failure you’re dealing with before you’ve wasted an hour going in the wrong direction. Here’s the exact workflow I use, with copy-paste prompts you can drop in today. Step 1: Collect the Full F