Working example or tutorial for setting up webpack, coffeescript, mocha?

I have a coffeescript project that started out as a mish-mash of gulp, rollup and babel.

I have converted it to build under webpack using coffee-loader and that works really nicely.

However ... how do I get my coffee/mocha tests to run smoothly under webpack? The mocha-loader docs are very terse. I imagine it is quite straightforward to get *.test.coffee to load, compile coffee -> es6 and run as a test suite.

But it is sort of non-obvious - to me anyway.

Help appreciated.