karma.config.cjs

const karmaChromeLauncher = require('karma-chrome-launcher');
const karmaCoverage = require('karma-coverage');
const karmaMocha = require('karma-mocha');
const karmaVite = require('karma-vite');

const isCI = !!process.env.CI;
const watch = !!process.argv.find((arg) => arg.includes('watch')) && !isCI;
const coverage = !!process.argv.find((arg) => arg.includes('--coverage'));

module.exports = (config) => {
  config.set({
    // base path that will be used to resolve all patterns (eg. files, exclude)
    basePath: '',

    plugins: [karmaMocha, karmaChromeLauncher, karmaVite, karmaCoverage],

    browsers: ['ChromeHeadlessNoSandbox'],
    browserNoActivityTimeout: 60000, //default 10000
    browserDisconnectTimeout: 10000, // default 2000
    browserDisconnectTolerance: 1, // default 0
    captureTimeout: 60000,

    // you can define custom flags
    customLaunchers: {
      ChromeHeadlessNoSandbox: {
        base: 'ChromeHeadless',
        flags: ['--no-sandbox', '--disable-setuid-sandbox'],
      },
    },

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

    // list of files / patterns to load in the browser
    files: [
      {
        pattern: 'test/**/*.spec.ts',
        type: 'module',
        watched: false,
        served: false,
      },
      {
        pattern: 'test/**/*.spec.tsx',
        type: 'module',
        watched: false,
        served: false,
      },
    ],

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

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

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

    // web server port
    port: 9876,

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

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

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

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

    coverageReporter: {
      dir: '.coverage/',
      reporters: [!isCI && { type: 'html', subdir: 'html' }, { type: 'lcovonly', subdir: '.' }].filter(Boolean),
    },
  });
};