Install Selenium in your headless VM

InstallSelenium.md

Install Selenium using vagrant

Install oracle java The official java packages has been removed from the Ubuntu repositories

$ sudo add-apt-repository ppa:webupd8team/java
$ sudo apt-get update
$ sudo apt-get install oracle-java7-installer

Install a virtual framebuffer

$ sudo apt-get install xvfb

And firefox

$ sudo apt-get install firefox

Start the framebuffer in the background Choose a display number that is unlikely to ever clash (if you are using vagrant, you should be able to choose any number)

$ Xvfb :99 -ac &

Export your display number

$ export DISPLAY=:99

BAM! You should now be able to run firefox

$ firefox

Close firefox and start a selenium server

$ java -jar selenium-server-standalone-2.xx.xxx.jar

To enable chrome

$ java -jar selenium-server-standalone-2.xx.xxx.jar -Dwebdriver.chrome.driver='/path/to/chromedriver'

####To run karma with selenium on remote host (VM) Install karma-webdriver-launcher

$ npm install karma-webdriver-launcher

Conect to your VM by using reverse SSH tunneling (or by using :private_network, see: http://stackoverflow.com/questions/16244601/vagrant-reverse-port-forwarding)

$ vagrant ssh -- -R 9876:localhost:9876

Update your karma config file:

module.exports = function(config) {
  var webdriverConfig = {
    hostname: '192.168.56.101',
    port: 4444
  };

  config.set({
    customLaunchers: {
        'Firefox': {
            base: 'WebDriver',
            browserName: 'FirefoxDriver',
            version: '26.0',
            name: 'Karma'
        }
    },
    ...
    browsers: ['Firefox'],
    ...

Run karma as usual