karma.conf.js

module.exports = (config) => {
  config.set({
    browsers: ["PhantomJS"],
    singleRun: true,
    frameworks: ["mocha"],
    files: [
      "./node_modules/phantomjs-polyfill/bind-polyfill.js",
      "./node_modules/babel-polyfill/browser.js",
      "tests.webpack.js",
    ],
    preprocessors: {
      "tests.webpack.js": ["webpack"],
    },
    reporters: ["dots"],
    webpack: {
      module: {
        loaders: [
          {
            test: /\.jsx?$/,
            exclude: /node_modules/,
            loader: "babel-loader",
          },
          {
            test: /\.css$/,
            loaders: [
              "style",
              "css?modules&importLoaders=1&localIdentName=[name]__[local]___[hash:base64:5]",
              "postcss",
            ],
          },
        ],
      },
      resolve: {
        extensions: ["", ".js", ".jsx"],
      },
      watch: true,
    },
    webpackServer: {
      noInfo: true,
    },
    plugins: [
      "karma-mocha",
      "karma-webpack",
      "karma-phantomjs-launcher",
      "karma-babel-preprocessor",
      "karma-mocha-reporter",
    ],
  });
};