Gruntfile.js

'use strict';

var karmaConfig = {
    demo: {
        configFile: 'demo/karma.conf.js'
    },
    disabled: {
        configFile: 'demo/karma.conf.js',
        detectBrowsers: {
            enabled: false
        }
    },
    phantomjs_disabled: {
        configFile: 'demo/karma.conf.js',
        detectBrowsers: {
            usePhantomJS: false
        }
    },
    noLogging: {
        configFile: 'demo/karma.conf.js',
        logLevel: 'ERROR'
    }
};

if(process.env.TRAVIS) {
    for(var keys = Object.keys(karmaConfig), i = 0; i < keys.length; i++) {
        var config = karmaConfig[keys[i]];

        config.customLaunchers = {
            ChromeHeadless_travis_ci: {
                base: 'ChromeHeadless',
                flags: ['--no-sandbox']
            },
            ChromiumHeadless_travis_ci: {
                base: 'ChromiumHeadless',
                flags: ['--no-sandbox']
            }
        };

        config.detectBrowsers = config.detectBrowsers || {};
        config.detectBrowsers.preferHeadless = true;
        config.detectBrowsers.postDetection = function(browsers) {
            var chromeHeadlessIndex = browsers.indexOf('ChromeHeadless');
            if(chromeHeadlessIndex !== -1) {
                browsers[chromeHeadlessIndex] = 'ChromeHeadless_travis_ci';
            }
            var chromiumHeadlessIndex = browsers.indexOf('ChromiumHeadless');
            if(chromiumHeadlessIndex !== -1) {
                browsers[chromiumHeadlessIndex] = 'ChromiumHeadless_travis_ci';
            }
            return browsers;
        };
    }
}

module.exports = function (grunt) {
    // Project configuration.
    grunt.initConfig({
        pkg: grunt.file.readJSON('package.json'),
        jshint: {
            options: {
                bitwise: true,
                curly: true,
                eqeqeq: true,
                forin: true,
                immed: true,
                latedef: true,
                newcap: true,
                noarg: true,
                noempty: true,
                nonew: true,
                regexp: true,
                undef: true,
                unused: true,
                indent: 4,
                quotmark: 'single',
                loopfunc: true,
                browser: true,
                node: true,
                globals: {
                }
            },
            test: ['Gruntfile.js', 'index.js']
        },
        copy: {
            demo: {
                expand: true,
                src: ['index.js', 'browsers/**'],
                dest: 'node_modules/karma-detect-browsers'
            }
        },
        karma: karmaConfig
    });

    // Load tasks.
    grunt.loadNpmTasks('grunt-contrib-copy');
    grunt.loadNpmTasks('grunt-contrib-jshint');
    grunt.loadNpmTasks('grunt-karma');

    // Register tasks.
    grunt.registerTask('test', ['jshint:test']);
    grunt.registerTask('demo', ['copy:demo', 'karma']);

    // Default task.
    grunt.registerTask('default', ['test']);
};