server.js

var webpack = require('webpack');
var WebpackDevServer = require('webpack-dev-server');
var config = require('./webpack.config');

// Start watching and bundling tests here
var tests = require('./webpack.test.config');
var testsCompiler = webpack(tests);

testsCompiler.watch({}, function (err) {
  if (err) console.log(err);
  //console.log('Test file bundled');
});

var serverOpts = {
  publicPath: config.output.publicPath,
  hot: true,
  historyApiFallback: true,
  stats: { colors: true }
};

// Primary app
new WebpackDevServer(webpack(config), serverOpts)
  .listen(3000, 'localhost', function (err) {
    if (err) {
      console.log(err);
    }

    console.log('Listening at localhost:3000');
  });