Chai and Mocha tests

[prabalsingh24]

Extension of #91
There are only 5 tests right now and all of them are failing.
And tests are not setup properly either.
There should be exhaustive tests to make sure there isn't any major bug in the code.

1. Setup of tests
2. Exhaustive tests for api endpoints and helper functions

[boss-contributions-bot]

Thanks @prabalsingh24, for raising the issue! 🙌

One of our mentors will revert on this soon. ✅

Star ⭐ this project and tweet 🐦 about BOSS 2020.

[prabalsingh24]

@hereisnaman what do you think? If you think this is a valid issue, please assign bounty.

I will do proper setup and start writing tests