karma.conf.js

const webpack = require('webpack');
const _ = require('lodash');
const optional = require('optional');

const webpackConf = require('./webpack.config.js');
const mochaConf = optional('./config/mocha.opts.json') || { timeout: 8000 };

const watch = process.env.WATCH_MODE === 1;
const testWebpackConf = _.assign({}, webpackConf, {
  devtool: watch ? false : 'inline-cheap-module-source-map',
  plugins: [
    new webpack.DefinePlugin({
      __DEV__: false,
      __TEST__: true,
      __PROD__: false,
      __I18N_ENABLED__: 'false',
      __DEV_TOOLS__: false,
    }),
    new webpack.ProvidePlugin({
      Buffer: ['buffer', 'Buffer'],
      process: 'process/browser.js',
    }),
  ],
});

testWebpackConf.externals = {
  cheerio: 'window',
  'react/addons': true,
  'react/lib/ExecutionEnvironment': true,
  'react/lib/ReactContext': true,
};

delete testWebpackConf.devServer;
delete testWebpackConf.entry;
delete testWebpackConf.output.filename;
testWebpackConf.mode = 'development';

module.exports = function karmaConfig(config) {
  const defaultConfig = {
    autoWatch: true,
    browserNoActivityTimeout: 60000,
    browserDisconnectTimeout: 60000,
    pingTimeout: 60000,
    browsers: ['CustomChromeHeadless'],
    captureTimeout: 60000,
    client: {
      mocha: mochaConf,
    },
    colors: true,
    concurrency: Infinity,
    coverageReporter: {
      dir: 'coverage/',
      reporters: [
        { type: 'html' },
        { type: 'text' },
      ],
    },
    customLaunchers: {
      CustomChromeHeadless: {
        base: 'ChromeHeadless',
        flags: [
          '--headless',
          '--disable-gpu',
          '--no-sandbox',
          '--remote-debugging-port=9222',
        ],
      },
    },
    files: [
      'loadtests.js',
    ],
    frameworks: ['webpack', 'mocha', 'chai', 'sinon', 'intl-shim'],
    logLevel: config.LOG_INFO,
    plugins: [
      'karma-webpack',
      'karma-sourcemap-loader',
      'karma-mocha',
      'karma-mocha-reporter',
      'karma-chai',
      'karma-sinon',
      'karma-intl-shim',
      'karma-chrome-launcher',
      'karma-coverage',
    ],
    preprocessors: {
      'loadtests.js': ['webpack', 'sourcemap'],
    },
    reporters: ['mocha', 'coverage'],
    singleRun: true,
    mochaReporter: {
        showDiff: true,
    },
    webpack: testWebpackConf,
    webpackMiddleware: {
      noInfo: true,
      stats: 'errors-only',
    },
  };

  if(watch) { //remove test coverage for test-watch
    delete defaultConfig.coverageReporter;
    defaultConfig.reporters = ['mocha'];
  }

  config.set(defaultConfig);
};