EventDispatcher Component=========================The Symfony EventDispatcher component implements the Mediator pattern in asimple and effective way to make your projects truly extensible.```phpuseSymfony\Component\EventDispatcher\EventDispatcher;useSymfony\Component\EventDispatcher\Event;$dispatcher=newEventDispatcher();$dispatcher->addListener('event_name',function(Event$event){// ...});$dispatcher->dispatch('event_name');```Resources---------You can run the unit tests with the following command: $ cd path/to/Symfony/Component/EventDispatcher/ $ composer install $ phpunit