karma.conf.js

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

const puppeteer = require('puppeteer');
const os = require('node:os');
process.env.CHROME_BIN = puppeteer.executablePath();

const DEFAULT_PROCESSES_TO_SHARD = 2;
const JASMINE_DEFAULT_TIMEOUT = 15000;

let executors = os ? Math.ceil(os.cpus().length / 2) : DEFAULT_PROCESSES_TO_SHARD;

if (os) {
  console.log('Total number of CPU\'s available:', os.cpus().length);

  if (os.cpus().length <= 2) {
    executors = os.cpus().length;
  }
}

module.exports = (config) => {
  config.set({
    basePath: '',
    frameworks: ['parallel', 'jasmine', '@angular-devkit/build-angular'],
    plugins: [
      require('karma-jasmine'),
      require('karma-chrome-launcher'),
      require('karma-jasmine-html-reporter'),
      require('karma-coverage'),
      require('karma-parallel'),
      require('@angular-devkit/build-angular/plugins/karma'),
      require('karma-spec-reporter'),
    ],
    webpackMiddleware: { stats: 'errors-only' },
    webpackServer: { noInfo: true },
    client: {
      clearContext: config.singleRun, // leave Jasmine Spec Runner output visible in browser
      jasmine: {
        random: false,
        timeoutInterval: (executors <= 2) ? (JASMINE_DEFAULT_TIMEOUT * 2) : JASMINE_DEFAULT_TIMEOUT,
      },
    },
    jasmineHtmlReporter: {
      suppressAll: false, // removes the duplicated traces
    },
    coverageReporter: {
      dir: require('node:path')
        .join(__dirname, './coverage/ngv'),
      subdir: '.',
      instrumenterOptions: {
        istanbul: { noCompact: true },
      },
      reporters: [
        { type: 'html' },
        { type: 'lcovonly' },
        { type: 'text-summary' },
      ],
    },
    reporters: ['kjhtml', 'spec'],
    port: 9876,
    colors: true,
    hostname: '0.0.0.0',
    logLevel: config.LOG_INFO,
    autoWatch: true,
    specReporter: {
      suppressSkipped: true,
      showSpecTiming: true,
    },
    browsers: ['ChromeHeadlessNoSandbox'],
    singleRun: false,
    parallelOptions: {
      executors,
    },
    customLaunchers: {
      ChromeHeadlessNoSandbox: {
        base: 'ChromeHeadless',
        flags: [
          '--headless',
          '--disable-gpu',
          // Without a remote debugging port, Google Chrome exits immediately.
          '--remote-debugging-port=9222',
          '--no-sandbox',
        ],
      },
    },
    browserNoActivityTimeout: 120000,
    browserSocketTimeout: 60000,
    browserDisconnectTimeout: 200000,
    captureTimeout: 240000,
  });
};