Storybook Testing — Storybook 10 Overview Storybook 10 unifies component testing into a single workflow: interaction tests via functions, visual regression via Chromatic TurboSnap, and accessibility audits via the a11y addon — all running through Vitest. Stories are executable test specifications, not just documentation. What's new in Storybook 10 (vs 9): - ESM-only enforced — the single breaking change; Node 20.16+ / 22.19+ / 24+ required; 29% smaller install - Module automocking ( ) — build-time module mocking, scoped per-project in preview.ts - CSF factories (React, preview) — → → → chain…