Guide to AI-Powered Frontend Testing with TWD

If you've ever watched an AI assistant generate a test file and thought "that looks right" only to spend the next twenty minutes fixing imports, selectors, and mock shapes — this series is for you. TWD (Test While Developing) is an in-browser testing library built around a simple idea: tests should run inside your real application, against the real DOM, while you develop. No jsdom. No simulated environments. Just your app, a sidebar showing results in real time, and instant feedback as you code.