karma.config.js

const path = require('path');

module.exports = config => config.set({
  frameworks: ['jasmine', 'chai-sinon'],
  reporters: ['progress'],
  files: ['test.webpack.js'],
  preprocessors: {
    'test.webpack.js': ['webpack', 'sourcemap'],
  },
  browsers: ['PhantomJS2'],
  webpack: require('./webpack.config'),
  webpackMiddleware: {
    noInfo: 'errors-only',
  },
});

MainCtrl.spec.js

describe('MainCtrl', () => {
  let $controller;

  beforeEach(inject(_$controller_ => {
    $controller = _$controller_;
  }));

  function createCtrl() {
    return $controller('MainCtrl');
  }

  describe('calculations', () => {
    it('adds two numbers', () => {
      const controller = createCtrl();

      controller.add(1, 2);

      expect(controller.result).to.equal(3);
    });
  });
});

test.webpack.js

import 'angular';
import 'angular-mocks/angular-mocks';

const testContext = require.context('./', true, /\.spec\.js$/);
testContext.keys().forEach(testContext);

webpack.config.js

'use strict';
/**
 * Configuration for Angular webpack development server
 * TODO also allow building for production
 */

const webpack = require('webpack');
const path = require('path');

let config = {
  target: 'web',

  entry: {},
  output: {},

  resolve: {
    modulesDirectories: [
      'web_modules',
      'node_modules',
      'client',
    ],
    extentions: ['js', 'html'],
  },

  plugins: [
    new webpack.DefinePlugin({
      __DEV__: 'development' === process.env.NODE_ENV,
      __STAGING__: 'staging' === process.env.NODE_ENV,
      __PRODUCTION__: 'production' === process.env.NODE_ENV,
      __CURRENT_ENV__: '\'' + (process.env.NODE_ENV) + '\'',
    }),
  ],

  module: {
    noParse: /\.min\.js/
  },

  node: {
   net: 'empty',
   tls: 'empty',
   dns : 'empty'
  }
};

if ('test' !== process.env.NODE_ENV) {
  config.entry = [
    'webpack-dev-server/client?http://localhost:3001',
    'webpack/hot/dev-server',
    './ng/client/index.js',
  ];

  config.output = {
    path: path.join(process.cwd(), '/ng/client/index.js'),
    pathInfo: true,
    publicPath: 'http://localhost:3002/client/',
    filename: 'main.js'
  };

  config.devtool = 'eval-source-map';
}
else {
  config.devtool = 'inline-source-map';
}

config.plugins = config.plugins.concat([
  new webpack.HotModuleReplacementPlugin(),
]);
n
config.module.loaders = [
  {test: /\.js$/, loaders: ['ng-annotate', 'babel?presets[]=es2015&presets[]=angular'], exclude: /node_modules/},
  {test: /\.html$/, loaders: ['html']},
];

module.exports = config;