LLM-Integrated App Bug Seams Reveal Testing Gaps
A rental-search assistant with LLMs and multi-market support faced persistent user defects despite 1,553 passing automated tests. Analysis of 252 bug-fix commits showed 44% resolved issues in four unseen seams: live browser runtime, non-default market, end-to-end flows, and whole-system level. A simple practice was adopted to identify the seam with most fixes.