Add more tests

[devshawn]

Currently, the client and the server both have very little tests. Any more added tests would be appreciated!

We utilize Jest for writing tests on both the server and the client. The README.md explains how to run the application, and "npm run test" or "lerna run test" will run the tests.

[danmakenoise]

I can take this! I'll write some tests for some of the server code.

[devshawn]

Awesome, @danmakenoise! 👍