text: module.exports = function(config) {
    const options = {
  
      // base path that will be used to resolve all patterns (eg. files, exclude)
      basePath: '',
  
  
      // frameworks to use
      // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
      frameworks: ['mocha', 'chai'],
  
  
      // list of files / patterns to load in the browser
      files: [
        'app/tests/**/*.js'
      ],
  
  
      // list of files to exclude
      exclude: [
      ],
  
  
      // preprocess matching files before serving them to the browser
      // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
      preprocessors: {
      },
  
  
      // test results reporter to use
      // possible values: 'dots', 'progress'
      // available reporters: https://npmjs.org/browse/keyword/karma-reporter
      reporters: ['progress'],
  
  
      // web server port
      port: 9876,
  
  
      // enable / disable colors in the output (reporters and logs)
      colors: true,
  
  
      // level of logging
      // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
      logLevel: config.LOG_INFO,
  
  
      // enable / disable watching file and executing tests whenever any file changes
      autoWatch: true,
  
  
      // start these browsers
      // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
      browsers: [],
  
      customLaunchers: {
        android: {
          base: 'NS',
          platform: 'android'
        },
        ios: {
          base: 'NS',
          platform: 'ios'
        },
        ios_simulator: {
          base: 'NS',
          platform: 'ios',
          arguments: ['--emulator']
        }
      },
  
      // Continuous Integration mode
      // if true, Karma captures browsers, runs the tests and exits
      singleRun: false
    };
  
    setWebpackPreprocessor(config, options);
    setWebpack(config, options);
    
    config.set(options);
  }
  
  function setWebpackPreprocessor(config, options) {
    if (config && config.bundle) {
      if (!options.preprocessors) {
        options.preprocessors = {};
      }
  
      options.files.forEach(file => {
        if (!options.preprocessors[file]) {
          options.preprocessors[file] = [];
        }
        options.preprocessors[file].push('webpack');
      });
    }
  }
  
  function setWebpack(config, options) {
    if (config && config.bundle) {
      const env = {};
      env[config.platform] = true;
      options.webpack = require('./webpack.config')(env);
      delete options.webpack.entry;
      delete options.webpack.output.libraryTarget;
    }
  }
  