karma.conf.js

// Reference: http://karma-runner.github.io/0.12/config/configuration-file.html
module.exports = function karmaConfig (config) {
  config.set({
    frameworks: [
      // Reference: https://github.com/karma-runner/karma-jasmine
      // Set framework to jasmine
      'jasmine'
    ],
    plugins: [
      require("karma-webpack"),
      require("karma-coverage"),
      require("karma-spec-reporter"),
      require("karma-sourcemap-loader"),
      require("karma-phantomjs-launcher"),
      require("karma-jasmine")
    ],
    reporters: [
      // Reference: https://github.com/mlex/karma-spec-reporter
      // Set reporter to print detailed results to console
      'spec',

      // Reference: https://github.com/karma-runner/karma-coverage
      // Output code coverage files
      'coverage'
    ],

    files: [
      // Grab all files in the app folder that contain .spec.
      'config/webpack.tests.js'
    ],

    preprocessors: {
      // Reference: http://webpack.github.io/docs/testing.html
      // Reference: https://github.com/webpack/karma-webpack
      // Convert files with webpack and load sourcemaps
        'config/webpack.tests.js': ['webpack', 'sourcemap']
    },

    browsers: [
      // Run tests using PhantomJS
      'PhantomJS'
    ],

    singleRun: true,

    // Configure code coverage reporter
    coverageReporter: {
      dir: 'build/coverage/',
      type: 'html'
    },

    webpack: require('./webpack.test'),

    // Hide webpack build information from output
    webpackMiddleware: {
      noInfo: true
    }
  });
};