We've got something wrong with the gem specifications and/or TravisCI setup, such that the tests against master version of jsonapi-resources aren't actually ran at all. This can be seen from e.g. this test run: https://travis-ci.org/venuu/jsonapi-authorization/jobs/186102969
If anyone wants to chime in and help with this, please do so :). This could be a good first PR to handle! If you have any questions, I'll try to answer to the best of my knowledge.