LoginListener.php

<?php

namespace Knowhow\UserBundle\Listeners;

use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Security\Http\Event\InteractiveLoginEvent;

class LoginListener implements EventSubscriberInterface
{

    static function getSubscribedEvents()
    {
        return array('onSecurityInteractiveLogin');
    }

    public function onSecurityInteractiveLogin(InteractiveLoginEvent $event)
    {
        $session = $this->getSession($event);
        $username = $this->getUsername($event);
        $this->setFlash($session, $username);
    }

    protected function getSession($event)
    {
        return $event->getRequest()->getSession();
    }

    protected function getUsername($event)
    {
        return $event->getAuthenticationToken()->getUser()->getUsername();
    }

    protected function setFlash($session, $username)
    {
        $session->setFlash('notice', "Welcome {$username}, you have successfully logged in.");
    }

}

LoginListenerTest.php

<?php

namespace Knowhow\UserBundle\Tests\Listeners;

use Knowhow\UserBundle\Listeners\LoginListener;

class LoginListenerTest extends \PHPUnit_Framework_TestCase
{
    public function testSubscribedEvents()
    {
        $loginEvent = new LoginListener();
        $this->assertEquals(array('onSecurityInteractiveLogin'), $loginEvent->getSubscribedEvents());
    }

    public function testOnSecurityInteractiveLogin()
    {
        $loginListener = new LoginListenerStub();

        $event = $this->getMockBuilder('eventObject') // don't know this class name
                      ->disableOriginalConstructor()  // but it probably needs some stuff
                      ->getMock();                    // and we don't actually call it for the test

        $session = $this->getMockBuilder('sessionObject') // don't know the class
                        ->disableOriginalConstructor()
                        ->getMock();

        $session->expects($this->once())
            ->method('setFlash')
            ->with(
                $this->equalTo('notice'),
                $this->equalTo('Welcome MyUser, you have successfully logged in.')
            );

        $loginListener->setUsername('MyUser');
        $loginListener->setSession($session);

        $loginListener->onSecurityInteractiveLogin($event); // Check that flash has been set/executed.ed.
    }

}

class LoginListenerStub extends LoginListener
{
    protected $username = null;
    protected $session = null;

    public function setUsername($username)
    { $this->username = $username;
    
    }

    public function setSession($session)
    {
        $this->session = $session;
    }

    protected function getUsername($event)
    {
        return $this->username;
    }

    protected function getSession($event)
    {
        return $this->session;
    }
}