karma.conf.js

module.exports = function (config) {
    config.set({
        //root path location to resolve paths defined in files and exclude
        basePath: '.',
        //files/patterns to exclude from loaded files
        exclude: [],
        //files/patterns to load in the browser
        files: [
            {pattern: 'test-context.js', watched: false}
            /*parameters:
                watched: if autoWatch is true all files that have set watched to true will be watched for changes
                served: should the files be served by Karma's webserver?
                included: should the files be included in the browser using <script> tag?
                nocache: should the files be served from disk on each request by Karma's webserver? */
            /*assets:
                {pattern: '*.html', watched:true, served:true, included:false}
                {pattern: 'images/*', watched:false, served:true, included:false} */
        ],

        //executes the tests whenever one of watched files changes
        autoWatch: true,
        //if true, Karma will run tests and then exit browser
        singleRun: false,
        //if true, Karma fails on running empty test-suites
        failOnEmptyTestSuite: false,
        //reduce the kind of information passed to the bash
        logLevel: config.LOG_WARN, //config.LOG_DISABLE, config.LOG_ERROR, config.LOG_INFO, config.LOG_DEBUG

        //list of frameworks you want to use, only jasmine is installed with this boilerplate
        frameworks: ['jasmine'],
        //list of browsers to launch and capture
        browsers: ['ChromeHeadlessNoSandbox'/*,'PhantomJS','Firefox','Edge','ChromeCanary','Opera','IE','Safari'*/],
        //list of reporters to use
        reporters: ['kjhtml', 'mocha' /*'mocha', 'kjhtml','dots','progress','spec'*/],

        //address that the server will listen on, '0.0.0.0' is default
        listenAddress: '127.0.0.1',
        //hostname to be used when capturing browsers, 'localhost' is default
        hostname: 'localhost',
        //the port where the web server will be listening, 9876 is default
        port: 9876,
        //when a browser crashes, karma will try to relaunch, 2 is default
        retryLimit: 0,
        //how long does Karma wait for a browser to reconnect, 2000 is default
        browserDisconnectTimeout: 5000,
        //how long will Karma wait for a message from a browser before disconnecting from it, 10000 is default
        browserNoActivityTimeout: 10000,
        //timeout for capturing a browser, 60000 is default
        captureTimeout: 60000,

        client: {
            //capture all console output and pipe it to the terminal, true is default
            captureConsole: false,
            //if true, Karma clears the context window upon the completion of running the tests, true is default
            clearContext: false,
            //run the tests on the same window as the client, without using iframe or a new window, false is default
            runInParent: false,
            //true: runs the tests inside an iFrame; false: runs the tests in a new window, true is default
            useIframe: true,
            jasmine: {
                //tells jasmine to run specs in semi random order, false is default
                random: false
            }
        },
        plugins: [
            require('karma-jasmine'),
            require('karma-webpack'),
            require('karma-jasmine-html-reporter'),
            require('karma-mocha-reporter'),
            require('karma-chrome-launcher')
        ],
        /* karma-webpack config
           pass your webpack configuration for karma
           add `babel-loader` to the webpack configuration to make
           the ES6+ code in the test files readable to the browser
           eg. import, export keywords */
        webpack: {
            optimization: {
                minimize: false
            },
            devtool: 'inline-source-map',
            module: {
                rules: [
                    {
                        test: /\.js$/i,
                        exclude: /(node_modules)/,
                        loader: 'babel-loader'
                    }
                ]
            }
        },
        preprocessors: {
            //add webpack as preprocessor to support require() in test-suits .js files
            'test-context.js': ['webpack']
        },
        webpackMiddleware: {
            //turn off webpack bash output when run the tests
            noInfo: false,
            stats: 'errors-only'
        },
        customLaunchers: {
            ChromeNoSandbox: {
                base: 'Chrome',
                flags: [
                    '--no-sandbox',
                    '--enable-logging=stderr',
                    '--disable-web-security',
                    '--disable-gpu',
                    '--no-proxy-server',
                    '--remote-debugging-port=9222'
                ]
            },
            ChromeHeadlessNoSandbox: {
                base: 'ChromeHeadless',
                flags: [
                    '--no-sandbox'
                ]
            }
        },
        /*karma-mocha-reporter config*/
        mochaReporter: {
            output: 'full'  //full, auto watch, minimal
        }
    });
};