Unit Testing in Open Sentencing Aggregator

Background on the problem the feature will solve/improved user experience

Our code currently lacks unit testing, which is needed for test driven development practices: easy debugging, functional testing, etc.

Describe the solution you'd like

Provide unit tests for Open Sentencing Aggregator

Tasks

Description of the development tasks needed to complete this issue, including tests,

Acceptance Criteria

Standards we believe this issue must reach to be considered complete and ready for a pull request. E.g precisely all the user should be able to do with this update, performance requirements, security requirements, etc as appropriate.