karma.conf.js

// Karma configuration
const webpackConfig = require('./webpack.config.js');
const path = require('path');

module.exports = (config) => {
  config.set({

    // base path that will be used to resolve all patterns (eg. files, exclude)
    basePath: '',

    // frameworks to use
    // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
    frameworks: ['jasmine'],

    plugins: [
      'karma-webpack',
      'karma-jasmine',
      'karma-coverage',
      'karma-coverage-istanbul-reporter',
      'karma-phantomjs-launcher'
    ],

    // list of files / patterns to load in the browser
    files: [
      { pattern: 'node_modules/d3/build/d3.js', watched: false },
      { pattern: 'node_modules/d3-tip/index.js', watched: false },
      { pattern: 'node_modules/d3-svg-legend/d3-legend.js', watched: false },
      { pattern: 'node_modules/lodash/lodash.js', watched: false },
      { pattern: 'src/**/*.js' },
      { pattern: 'test/**/*.spec.js' }
    ],

    // list of files to exclude
    exclude: [
    ],

    // preprocess matching files before serving them to the browser
    // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
    preprocessors: {
      'test/**/*.spec.js': ['webpack'],
      'src/**/*.js': ['webpack', 'coverage']
    },

    // webpack config
    webpack: webpackConfig,

    // test results reporter to use
    // possible values: 'dots', 'progress'
    // available reporters: https://npmjs.org/browse/keyword/karma-reporter
    reporters: ['progress', 'coverage-istanbul'],
    coverageIstanbulReporter: {
      reports: ['html', 'lcovonly', 'text-summary'],
      dir: path.join(__dirname, 'coverage'),
      fixWebpackSourcePaths: true,
      skipFilesWithNoCoverage: true,
      'report-config': {
        html: {
          subdir: 'html'
        }
      }
    },

    // web server port
    port: 9876,

    // enable / disable colors in the output (reporters and logs)
    colors: true,

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

    // enable / disable watching file and executing tests whenever any file changes
    autoWatch: true,

    // start these browsers
    // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
    browsers: ['PhantomJS'],

    // Continuous Integration mode
    // if true, Karma captures browsers, runs the tests and exits
    singleRun: true,

    // Concurrency level
    // how many browser should be started simultaneous
    concurrency: Infinity,

    processKillTimeout: 5000,

    // No config for webpackServer
    webpackServer: {
      noInfo: true
    }

  });
};