`yarn test` throws an error. Fix is here: https://stackoverflow.com/questions/49784990/why-does-react-router-break-create-react-app-tests-how-to-fix-this
yarn testthrows an error.Fix is here:
https://stackoverflow.com/questions/49784990/why-does-react-router-break-create-react-app-tests-how-to-fix-this