Mocha compiler for css-module support in tests using sass

cli.bash

mocha --compilers js:babel/register,js:./test/css-modules-compiler.js --recursive -w

css-modules-compiler.js

var hook = require('css-modules-require-hook');
var sass = require('node-sass');

hook({
  extensions: ['.scss'],
  preprocessCss: function (css) {
    var result =  sass.renderSync({
      data: css
    });

    return result.css;
  }
});