Using css-modules-require-hook for testing React components styled with Sass

setup.js

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

hook({
    extensions: ['.scss'],
    preprocessCss(css, filepath) {
        const result = sass.renderSync({
            data: css,
            includePaths: [path.resolve(filepath, '..')]
        });
        return result.css;
    }
});