I've written a couple of tutorials that you might find helpful to get started. They don't go all the way to Enzyme, but they do cover Mocha and Chai. Their focus is on a particular philosophy of writing tests called Test Driven Development. I hope they're useful for you. A Gentle Introduction to Javascript Test Driven Development: Part 1 One weird trick that will change the way you code forever: JavaScript TDD

Hi Rami, that link is a good one. Lin Clark is pretty amazing with those cartoons. I'm curious though, is there anything in particular about React that you like? What makes it useful for you?

That's good advice. If people aren't even getting that right then a project is doomed from the start.