AI turned every developer into a reviewer. Nobody tested the reviewer. A five-case regression suite can expose a weak AI reviewer in under ten minutes, and it runs for free when you use MonkeyCode's free models and its free server option. Disclosure: This article was prepared as part of MonkeyCode's product outreach.
The premise is simple. Teams adopt AI coding tools, then trust the AI to review their pull requests. They evaluate the code-writing model with benchmarks, but they never evaluate the review model. A reviewer that misses an off-by-one or a path traversal is worse than no reviewer, because it creates false confidence.
The five bug patterns
A good regression suite tests common failure classes, not exotic ones. These five cover most real-world review misses:
Off-by-one in a loop boundary
