Create unit tests for controller directory

[pogi7]

Checklist before submitting a feature request

• I have reviewed CONTRIBUTING.md document
• I have done a quick search on the issue tracker to check if the feature request is not redundant

Is your feature request related to a problem? If yes, describe the problem

I am annoyed that there are limited unit tests for the code in the controller directory.

Describe the desired feature

I want there to be a unit test for every exported function in the controller directory. This will allow for high code quality as these tests can be used to verify that the function behaves as expected while under test.

Additional context

Currently the test suite uses jest as their testing engine. Use this test suite for the controller code
https://jestjs.io