ai-regression-testing

To prevent AI from reintroducing the same bugs during API route development, run a bug-check first, then add a sandbox-forced regression test that asserts required response fields and verifies sandbox/production parity to catch silent regressions.

Sandbox-mode DB-free regression testing forces a mock environment to validate backend logic behavior quickly without database dependencies. It asserts response contracts and required fields to catch shape mismatches immediately after code review or bug fixes.

To validate sandbox and production parity for Next.js API routes, enforce regression tests under forced sandbox settings that assert the response shape matches between paths, catching the most common AI regression class where missing columns or shapes diverge.

Yes, you can use vitest to automate response contract regression checks for AI-assisted code. By asserting required response fields and invariants, you catch missing columns or shape mismatches immediately before changes reach production.

AI code review misses missing SELECT fields and response shape mismatches because the same model writes and reviews code, creating known blind spots. Enforcing automated regression tests validates field completeness and catches these silent contract failures.