The goal of this repository is to answer this question. Please note that I focused mainly on the TDD routine, trying to see how it fits with the frontend, so the production code, in terms of react best practices and state management, isn't as good as I would like. But, again, this isn't the scope of the project.
And, by the way, it seems really possible to drive UI code from tests!
As this project was bootstrapped with create-react-app, you can use all the available scripts:
npm start
Runs the app in the development mode.
Open http://localhost:3000 to view it in the browser.
npm test
Launches the test runner in the interactive watch mode.
See the section about running tests for more information.
npm run build
Builds the app for production to the build folder.