karma.conf.js

// Reference: http://karma-runner.github.io/0.12/config/configuration-file.html
module.exports = function (config) {
  config.set({
    frameworks: [
      // Reference: https://github.com/karma-runner/karma-jasmine
      // Set framework to jasmine
      'jasmine'
    ],

    reporters: [
      // Reference: https://github.com/mlex/karma-spec-reporter
      // Set reporter to print detailed results to console
      'progress',

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

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

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

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

    singleRun: true,

    // Configure code coverage reporter
    coverageReporter: {
      dir: 'coverage/',
      reporters: [
        { type: 'text-summary' },
        { type: 'lcov' }
      ]
    },

    webpack: {
      devtool: 'inline-source-map',
      module: {
        loaders: [
          { test: /\.js$/, loader: 'babel-loader' },
          { test: /\.html$/, loader: 'html-loader' },
          {
            enforce: 'pre',
            test: /\.js$/,
            exclude: [
              /node_modules/,
              /\.spec\.js$/
            ],
            loader: 'istanbul-instrumenter-loader',
            query: {
              esModules: true
            }
          }
        ]
      }
    },

    webpackMiddleware: {
      // webpack-dev-middleware configuration
      // i. e.
      stats: 'errors-only'
    },
    coverageIstanbulReporter: {
      reports: ['text-summary'],
      fixWebpackSourcePaths: true
    }
  });
};