JavaScript unit testing with Mocha, Chai

Google search keyword: sinon js vs jasmine

Some of the interesting sites where testing was discussed with simple examples:

http://sinonjs.org/

https://facebook.github.io/jest/

http://thejsguy.com/2015/01/12/jasmine-vs-mocha-chai-and-sinon.html

https://medium.com/powtoon-engineering/a-complete-guide-to-testing-javascript-in-2017-a217b4cd5a2a

http://blog.testdouble.com/posts/2016-03-13-testdouble-vs-sinon

Started looking for an example of JavaScript unit testing and came across this site, https://www.sitepoint.com/unit-test-javascript-mocha-chai/.
Simple explanation, give it a try!