karma.conf.js

var webpack = require('webpack');
var path = require('path');

module.exports = function (config) {
  config.set({

    browsers: ['PhantomJS'],

    singleRun: !!process.env.CI,

    frameworks: [ 'mocha' ],

    files: [
      './node_modules/phantomjs-polyfill/bind-polyfill.js',
      'tests.webpack.js'
    ],

    preprocessors: {
      'tests.webpack.js': [ 'webpack', 'sourcemap']
    },

    reporters: [ 'mocha', 'coverage', 'coveralls'],

    coverageReporter: {
      dir: 'coverage/',
      reporters: [
        // reporters not supporting the `file` property
        { type: 'html', subdir: 'report-html' },
        { type: 'lcov', subdir: 'report-lcov' }
      ]
    },

    plugins: [
      require("karma-webpack"),
      require("karma-mocha"),
      require("karma-mocha-reporter"),
      require("karma-phantomjs-launcher"),
      require("karma-sourcemap-loader"),
      require("karma-coverage"),
      require("karma-coveralls"),
    ],

    webpack: {
      devtool: 'inline-source-map',
      module: {
        preLoaders: [
          {
           test: /\.js$/,
           exclude: /(tests\.webpack.js|node_modules|__tests__)/,
           loader: 'isparta'
          }
        ],
        loaders: [
          { test: /\.(jpe?g|png|gif|svg)$/, loader: 'url', query: {limit: 10240} },
          {
            test: /\.js$/,
            exclude: /node_modules/,
            loader: 'babel'
          },
          { test: /\.json$/, loader: 'json-loader' },
          { test: /\.less$/, loader: 'style!css!less' },
          { test: /\.scss$/, loader: 'style!css?modules&importLoaders=2&sourceMap&localIdentName=[local]___[hash:base64:5]!autoprefixer?browsers=last 2 version!sass?outputStyle=expanded&sourceMap' }
        ],
      },
      externals: {
        'cheerio': 'window',
        'react/addons': true,
        'react/lib/ExecutionEnvironment': true,
        'react/lib/ReactContext': true
      },
      resolve: {
        modulesDirectories: [
          'src',
          'node_modules'
        ],
        extensions: ['', '.json', '.js']
      },
      plugins: [
        new webpack.IgnorePlugin(/\.json$/),
        new webpack.NoErrorsPlugin(),
        new webpack.DefinePlugin({
          __CLIENT__: true,
          __SERVER__: false,
          __DEVELOPMENT__: true,
          __DEVTOOLS__: false  // <-------- DISABLE redux-devtools HERE
        })
      ]
    },

    webpackServer: {
      noInfo: true
    }

  });
};