karma.conf.js

var webpack = require('webpack');

module.exports = function (config) {
  config.set({
    browsers: [ 'Chrome' ],
    singleRun: true,
    frameworks: [ 'mocha' ],
    files: [
      'tests.webpack.js'
    ],
    plugins: [ 'karma-chrome-launcher', 'karma-chai', 'karma-mocha',
      'karma-sourcemap-loader', 'karma-webpack', 'karma-coverage',
      'karma-mocha-reporter'
    ],
    preprocessors: {
      'tests.webpack.js': [ 'webpack', 'sourcemap' ]
    },
    reporters: [ 'mocha', 'coverage' ],
    webpack: {
      devtool: 'inline-source-map',
      module: {
        loaders: [
          { test: /\.js$/, loader: 'babel-loader', exclude: /node_modules/ }
        ],
        postLoaders: [ {
          test: /\.js$/,
          exclude: /(test|node_modules)\//,
          loader: 'istanbul-instrumenter' } ]
      }
    },
    webpackServer: {
      noInfo: true
    },
    coverageReporter: {
      type: 'html',
      dir: 'coverage/'
    }
  });
};