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GenUI Test Harness AI-generated UIs look great in screenshots. But do they actually work? GenUI Test Harness is an autonomous QA agent that crawls any deployed web app, uses Gemini to infer what the intended user flows should be, auto-generates end-to-end tests, executes them in a real browser, and delivers a live-streamed test report — complete with annotated browser replays, visual diffs, and actionable fix suggestions. No test code written. No config files. Just paste a URL and watch the agent break your app before your users do.