Logic Mutations: The Bugs Your Tests Are Secretly Ignoring

In Part 2 of this series, we looked at boundary mutations — the category with the highest detection rate (63.8%). The numbers were reassuring, with a catch: 36.2% of boundary bugs still survived, and the ones that slipped through were the ones that mattered most. Logic mutations are a harder problem. In our benchmark of 195 AI-run sessions against the SDET Code challenge library, logic bugs were caught only 47.5% of the time. That is the second lowest detection rate of any category, beaten to th