karma.conf.js

// Karma configuration
// Generated on Tue Aug 11 2015 11:33:37 GMT-0700 (PDT)

const path = require('path');

module.exports = function (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'],

    // list of files / patterns to load in the browser
    files: [
      'test/index.js'
    ],

    preprocessors: {
      'test/index.js': 'webpack'
    },

    webpack: {
        mode: 'development',
        module: {
          rules: [
            // instrument only testing sources with Istanbul
            {
              test: /\.js$/,
              use: { loader: 'istanbul-instrumenter-loader' },
              include: path.resolve('src/')
            }
          ]
        }
    },

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

    // test results reporter to use
    // possible values: 'dots', 'progress'
    // available reporters: https://npmjs.org/browse/keyword/karma-reporter
    reporters: ['coverage-istanbul'],

    coverageIstanbulReporter: {
      reports: ['html', 'text-summary', 'lcovonly'],
      fixWebpackSourcePaths: true
    },

    // 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: false,

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

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