Been trying to implement some tests for NextJS Redux App. You can get most of the way there by following the very good information here =>  http://redux.js.org/recipes/writing-tests

But if you drop .babelrc into your NextJS project as per above it stops the npm run dev working.

So you need to configure it for next-jest which you can do by following the examples here => https://github.com/zeit/next.js/tree/master/examples/with-jest