The PR was sent with the following:

1. I added Travis CI to the project and added Rspec as a testing tool.
2. All of the examples were tested with the mentioned gem and I've covered all of the scenarios previously tested with minitest.
3. I updated some of the file routes to work properly and updated the readme files as well.

Here you can follow the link to the Travis CI repo.

Let me know if has met your expectations.