karma.config.js

var path = require('path');

module.exports = function(config) {
  config.set({
    // enable / disable watching file and executing tests whenever any file changes
    autoWatch: true,
    // list of files / patterns to exclude
    exclude: [],
    browsers: ['PhantomJS'],
    files: ['tests/**/*.spec.js'],
    frameworks: ['jasmine'],
    preprocessors: {
      'tests/**/*.spec.js': ['webpack']
    },
    reporters: ['progress', 'coverage'],
    coverageReporter: {
      dir: 'coverage',
      reporters: [
        // reporters not supporting the `file` property
        // { type: 'html', subdir: 'report-html' }, // fro dev
        { type: 'lcov', subdir: 'report-lcov' } // for coveralls
      ]
    },
    webpack: {
      cache: true,
      module: {
        loaders: [
          {
            test: /(\.js)$/,
            loader: 'babel-loader',
            exclude: /(node_modules)/,
            query: {
              presets: ['env']
            }
          },
          {
            test: /\.spec.js$/,
            exclude: /(node_modules)/,
            loader: 'babel-loader',
            query: {
              cacheDirectory: true,
              presets: ['env']
            }
          },
          {
            // transpile and instrument only testing sources with isparta
            test: /\.js$/,
            include: path.resolve('src/'),
            exclude: /(src\/vendor\/)/,
            loader: 'isparta-loader'
          }
        ]
      }
    },
    // Continuous Integration mode
    // if true, it capture browsers, run tests and exit
    singleRun: true,

    colors: true,

    // level of logging
    // possible values: LOG_DISABLE || LOG_ERROR || LOG_WARN || LOG_INFO || LOG_DEBUG
    logLevel: config.LOG_INFO,

    // If browser does not capture in given timeout [ms], kill it
    captureTimeout: 60000,
    browserNoActivityTimeout: 200000,
    browserDisconnectTolerance: 5
  });
};