karma.conf.js

// Karma configuration
// Generated on Tue Feb 27 2018 14:37:43 GMT+0530 (IST)
process.env.CHROME_BIN = require('puppeteer').executablePath()

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

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

    plugins: [
      'karma-chrome-launcher',
      'karma-rollup-preprocessor',
      'karma-japa'
    ],

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

    // list of files / patterns to load in the browser
    files: [
      'node_modules/@babel/polyfill/dist/polyfill.js',
      { pattern: 'test/unit/*.spec.js', watched: false }
    ],

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

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

    rollupPreprocessor: require('./test/unit/rollup.config.js'),

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

    // 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: ['Chrome_without_security'],

    customLaunchers: {
      Chrome_without_security: {
        base: 'ChromeHeadless',
        flags: ['--no-sandbox']
      }
    },

    // 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
  })
}