Confirure unit tests for gitlab runner

Create another Karma config file karma-ci.conf.js that will be used by gitlab-runner. In this configuration we will use puppeteer instead of usual Chrome browser:

karma-ci.conf.js

process.env.CHROME_BIN = require('puppeteer').executablePath();

module.exports = config => {
    config.set({
        basePath: './js',
        frameworks: ['jasmine'],
        files: [
            '**/*.js'
        ],
        exclude: [
            'main.js'
        ],
        preprocessors: {},
        reporters: ['progress'],
        port: 9876,
        colors: true,
        logLevel: config.LOG_INFO,
        autoWatch: true,
        browsers: ['Chrome'],
        customLaunchers: {
            Chrome: {
                base: 'ChromeHeadless',
                flags: ['--no-sandbox']
            }
        },
        singleRun: true,
        concurrency: Infinity
    });
};

Add test-ci command to package.json

"scripts": {
  "test": "karma start karma.conf.js",
  "protractor": "protractor e2e-tests/protractor.conf.js",
  "start": "http-server . -a localhost -p 8000 -c-1",
  "test-ci": "karma start karma-ci.conf.js"
 },

Push changes to the repository, then you can see a new pipeline: