karma.conf.js

// Karma configuration file, see link for more information
// https://karma-runner.github.io/1.0/config/configuration-file.html

const { join } = require('path');
const { constants } = require('karma');

module.exports = () => {
  return {
    basePath: '',
    frameworks: ['parallel', 'jasmine', '@angular-devkit/build-angular', 'viewport'],
    plugins: [
      require('karma-parallel'),
      require('karma-jasmine'),
      require('karma-viewport'),
      require('karma-chrome-launcher'),
      require('karma-jasmine-html-reporter'),
      require('karma-coverage-istanbul-reporter'),
      require('@angular-devkit/build-angular/plugins/karma')
    ],
    client: {
      clearContext: false // leave Jasmine Spec Runner output visible in browser
    },
    coverageIstanbulReporter: {
      dir: join(__dirname, '../../coverage'),
      reports: ['html', 'lcovonly'],
      fixWebpackSourcePaths: true
    },
    reporters: ['progress', 'kjhtml'],
    port: 9876,
    colors: true,
    logLevel: constants.LOG_INFO,
    autoWatch: true,
    browsers: ['ChromeHeadlessNoSandbox'],
    singleRun: true,
  customLaunchers:{
      ChromeHeadlessNoSandbox:{
          base:"ChromeHeadless",
          flags:[
              "--no-sandbox",
              // required to run without privileges in Docker
              "--disable-web-security",
              "--disable-gpu",
              "--remote-debugging-port=9222"
          ]
      }
  },
    parallelOptions: {
      executors: 3
    },
  };
};