Write tests! c:

[01dr]

Using Jest & Enzyme preferred, but we are open to discuss

Redux: https://github.com/reactjs/redux/blob/master/docs/recipes/WritingTests.md
Sagas: https://github.com/redux-saga/redux-saga/blob/master/docs/advanced/Testing.md
Test rendering with Enzyme: https://github.com/airbnb/enzyme