Koobiq Design System Uses Playwright and Docker for Reliable Screenshot Testing

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The Koobiq design system team has set up automated screenshot testing for its React component library using Playwright on top of Storybook. Tests capture component variants and states in a grid format across light and dark themes, reducing the number of baseline images needed while making visual regressions immediately obvious. To eliminate environment-related flakiness, all screenshots are taken and compared exclusively inside a Docker container, both locally and in CI. The configuration locks locale, time zone, and animations, and sets a zero pixel-difference threshold so any unintended style change causes an immediate test failure. Updating baselines requires no manual Docker work — a slash command on a pull request triggers CI to regenerate and commit the new reference images automatically.

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