Your AI Agent Says All Tests Pass. Your App Is Still Broken

AI coding agents create a 'Vibe Coding Death Spiral' where they write both implementation and tests in the same session, producing tests that validate their own misunderstandings rather than the developer's intent. The proliferation of AI-generated tests—often numbering in the thousands—creates massive maintenance burdens and couples tightly to implementation details, while flaky E2E tests train teams to ignore real failures. The author proposes rethinking validation beyond traditional test suites, introducing a concept called 'Knight Rider Testing' as an alternative approach.