Added 100% unit test coverage for utils folder

[dariobanfi]

Because why not?

I actually did it to evaluate Jest as test runner, but I figured it's a good example to have in the repo. 🙂

[ctrlplusb]

Awesome @dariobanfi this is great. Always great to have unit tests. 👍

Thanks a ton for doing this.

@strues would you mind parsing this and if you are happy going for it?

[strues]

Perfect 👍