This is a little example repository demonstrating how to make fetch requests within React.
This makes a request, storing the result in state to re-render the component. This is the typical way React components have been built in the past. There are also some automated tests for it contained within HelloStarWars.unit.js
This uses React hooks which produces a functional component and is much cleaner. It uses a custom hook useFetch.js to achieve this. Again this features some unit tests within HelloStarWarsHooks.unit.js. This did produce some warnings that can probably be eliminated with the latest version of React 16. (Due to trying to await an act())