Unit testing

[mikaelsvensson]

The API lacks unit testing. Implement it.

Reading suggestions:
http://matthewlehner.net/rails-api-testing-guidelines/
http://www.emilsoman.com/blog/2013/05/18/building-a-tested/
http://commandercoriander.net/blog/2014/01/04/test-driving-a-json-api-in-rails/
http://ahimmelstoss.github.io/blog/2014/07/27/testing-a-rails-api-with-rspec/
http://guides.rubyonrails.org/testing.html#integration-testing
http://www.calicowebdev.com/2011/01/25/rails-3-sqlite-3-in-memory-databases/
http://blog.markstarkman.com/blog/2013/01/23/using-sqlite-to-test-active-record-models/
http://chrisroos.co.uk/blog/2006-02-08-in-memory-sqlite-database-for-rails-testing