add tests

[chinchang]

add tests

[vivekannan]

I am game. New to writing tests, so if you could give me some pointers, I will be obliged.

[chinchang]

You could try setting up tests with mocha and chai (if required).

Read here:

• http://callmenick.com/post/basic-front-end-testing-with-mocha-chai
• https://mochajs.org/

Also try looking at some other open source projects on how to setup tests.

[NickHatBoecker]

Cypress could be useful too: https://www.cypress.io/