Visual regression unit testing for HTML/CSS.
Work in progress.
Basic plan: Exercise a small bit of HTML+CSS by rendering it in a browser. Take a screenshot and store it. Compare future runs against the stored screenshot.
CSS Unit's part of the plan is to do the rendering, taking the screenshots, and comparing a new screenshot against an old one. It only handles one file at a time, and it doesn't persist the screenshots in any way. Clients of css-unit are responsible for that stuff.
Usage with gulp provided by https://github.com/leff/gulp-css-unit.