bombadil

Bombadil autonomously explores your UI and validates correctness properties. It's property-based testing applied to web UIs: you define what 'correct' means and it finds every way your app violates that.

Unlike traditional end-to-end tests where you script specific paths, Bombadil explores paths you didn't think of. It clicks, types, navigates, and checks invariants at every step. When it finds a violation, it gives you the exact sequence of actions that broke it.

early but. MIT licensed, Rust.

The catch: property-based testing requires you to define properties: 'no console errors,' 'this element always exists,' 'this form never submits empty.' Writing good properties is a skill, and bad properties produce either false positives or miss real bugs. And autonomous exploration of complex UIs can be slow. A full exploration of a large app takes real time.