Add unit tests and code coverage

Created by: Zach DeCook

If we are ever to accomplish updating to Python3 (#1 (closed)), getting code coverage will be critical to making sure every line has been updated.

Imported comments:

By Zach DeCook on 2019-10-03T03:54:39.055Z

mentioned in issue #3 (closed)

By Zach DeCook on 2019-10-03T03:30:03.281Z

closed

By Zach DeCook on 2019-10-03T03:30:03.153Z

By Zach DeCook on 2019-09-28T15:39:22.064Z

mentioned in merge request !1