How does mocha require work

mocha-require-using-webpack-root.txt

my question is related to http://stackoverflow.com/questions/31326199/mocha-equivalent-to-webpacks-resolve-root
am using root paths in my app code.

webpack config snippet:

```json
const path = require('path'),
      webpack = require('webpack'),
      PATHS = {
        app: path.join(__dirname, 'app'),
        images: path.join(__dirname, 'app/images'),
        css: path.join(__dirname, 'app/css'),
        build: path.join(__dirname, 'build')
      };

module.exports = {
  // Entry accepts a path or an object of entries.
  // We'll be using the latter form given it's
  // convenient with more complex configurations.
  entry: {
    app: [
      'babel-polyfill',
      PATHS.app
    ]
  },
  output: {
    path: PATHS.build,
    publicPath: '/',
    filename: '[name].js'
  },
  resolve: {
    root: [
      PATHS.app,
      PATHS.images,
      PATHS.css
    ],
    extensions: ['', '.js', '.json', '.jsx']
  }
}
```

after changing the NODE_PATH. my mocha tests work as well

but the imports used in my mocha tests are still relative
eg. import { attemptLogin } from '../../app/actions/action_creators'; 
in my mocha tests

but in the app code, i use relative to webpack root
something like
import { attemptLogin } from 'app/actions/action_creators';

how to use something similar in my mocha tests as well ?