Jest Wepback Testing Preprocessor

preprocessor.js

'use strict';

// Adapted from https://github.com/ColCh/jest-webpack/blob/f8e02b7a51da48c55395392e61d9c03789e43911/preprocessor.js
// Packages these tests with deps with webpack https://github.com/ninjapanzer/Backbone-Flux-React-Webpack/tree/master/__tests__

var webpack = require('webpack');
var MemoryFileSystem = require('memory-fs');

var fs = new MemoryFileSystem();

module.exports = {
  process: function (src, filename) {
    var options = require('./webpack.config.test.js');
    options.entry = filename;
    options.output.path = '/';
    options.output.filename = filename;

    var compiler = webpack(options);

    compiler.outputFileSystem = fs;

    var stats = null;

    compiler.run(function() {
      console.log("\nwebpack compile "+ filename)
      stats = true;
    });

    while (stats === null) {
      require('deasync').sleep(100);
    }

    var contentBuffer = fs.readFileSync(filename);
    var content = contentBuffer + '';

    fs.unlinkSync(filename);

    return content;
  }
};

webpack.config.test.js

var webpack = require("webpack");
var path = require("path");
var bower_dir = __dirname + '/bower_components';
var resolveBowerPath = function(componentPath) {
    return path.join(bower_dir, componentPath);
};
module.exports = {
  entry: './src/app.coffee',
  devtool: "source-map",
  target: 'node',
  output: {
    path: './build',
    filename: 'bundle.test.js'
  },
  module: {
    noParse: [
      resolveBowerPath('/react/react-with-addons.js'),
      resolveBowerPath('/flux/dist/Flux.js'),
      resolveBowerPath('/underscore/underscore-min.js'),
      resolveBowerPath('/jquery/jquery.min.js')
    ],
    loaders: [
      { test: /\.coffee$/, loader: "coffee-jsx-loader" }
      //{ test: /\.coffee$/, loader: "coffee" }
    ]
  },
  plugins: [
    new webpack.ProvidePlugin({
      underscore: 'underscore',
      jquery: 'jquery',
      Backbone: 'backbone',
      React: 'react',
      Flux: 'flux'
    })
  ],
  resolve: {
    alias: {
      'jquery': resolveBowerPath('/jquery/dist/jquery.min.js'),
      'backbone': resolveBowerPath('/backbone/backbone.js'),
      'react': resolveBowerPath('/react/react-with-addons.js'),
      'flux': resolveBowerPath('/flux/dist/Flux.js'),
      'underscore': resolveBowerPath('/underscore/underscore-min.js')
    },
    extensions: ["", ".web.coffee", ".web.js", ".coffee", ".js"]
  }
};