old_contents: // karma.conf.js
  module.exports = function(config) {
    config.set({
      basePath: '.',
      frameworks: ['jasmine'],
      browsers : ['PhantomJS'],
      singleRun: true,
      files: [
        '../node_modules/babel-polyfill/dist/polyfill.js',
        '../node_modules/whatwg-fetch/fetch.js',
        '../node_modules/react/dist/react.js',
        '../node_modules/react-dom/dist/react-dom.js',
        '../node_modules/react/dist/react-with-addons.js',
        '../node_modules/whatwg-fetch/index.js',
        '../dist/react-i18n.js',
        '../tests/unit/**/*.js',
      ],
    });
  };
  
new_contents: // karma.conf.js
  module.exports = function(config) {
    config.set({
      basePath: '.',
      frameworks: ['jasmine'],
      browsers : ['PhantomJS'],
      singleRun: true,
      files: [
        '../node_modules/babel-polyfill/dist/polyfill.js',
        '../node_modules/whatwg-fetch/fetch.js',
        '../node_modules/react/dist/react.js',
        '../node_modules/react-dom/dist/react-dom.js',
        '../node_modules/react/dist/react-with-addons.js',
        '../dist/react-i18n.js',
        '../tests/unit/**/*.js',
      ],
    });
  };
  
subject: remove undefined module