Introduction to Static and Dynamic testing using JS

This is a simple example for how to do static testing (JSLint) and perfoming dynamic testing with the help of Jest.

Why JS?

• Rapid growth of popularity during recent years (among job recruiters)
• More and more projects (GitHub) are written in javascript
• Huge ecosystem of libaries and frameworks (ReactJS, AngularJS, VueJS etc)
• Easy and quick to learn (slow learning curve)

Why JSLint?

• Improves code quality
• Minimizes bug-proned code
• (-) Can be unnecessary and annoying (e.g. on harmless features)..

Why Jest?

• Free and very easy to setup
• Lets you generate and watch test results
• Generates code coverage reports
• Built and used by Facebook
• Used by other heavy supporters (e.g. Spotify, Instagram, Paypal, Reddit, Twitter, Oculus, Pinterest etc.)

Built with

• JSLint - Static code analysis tool for checking JS code compliance with code rules.
• Jest - Testing framework for unit testing made by Facebook