AVA is a test runner for Node.js with a concise API, detailed error output, embrace of new language features and process isolation that let you write tests more effectively. AVA is written by Mark Wubben, Sindre Sorhus and Vadim Demedes.
You may also be interested in ...
How Do You Remove Unused CSS From a Site?
Here's what I'd like you to know upfront: this is a hard problem. If you've landed here because you're hoping to be pointed at a tool you can run that tells you exactly what CSS you can delete from your project, well... there are tools out there, but I'm warning you to be very careful with them because none of them can ever tell you the complete story. Post written by Chris Coyer.
Splitting
Splitting creates elements and adds CSS variables to unlock amazing possibilities for animating text, grids, and more!
Vuelidate
Vuelidate is a simple and lightweight model-based validation for Vue.js 2.0