Domain-Driven Design in PHP

Testing Domain Events

You already know how to publish Domain Events, but how can you unit test this and ensure that UserRegistered is really fired? The easiest way we suggest is to use a specific EventListener that will work as a Spy to record whether or not the Domain Event was published. Let's see an example of the User Entity unit test:

use Ddd\Domain\DomainEventPublisher;use Ddd\Domain\DomainEventSubscriber;class UserTest extends \PHPUnit_Framework_TestCase{    // ...    /**     * @test     */    public function itShouldPublishUserRegisteredEvent()    {        $subscriber = new SpySubscriber();        $id = DomainEventPublisher::instance()->subscribe($subscriber);        $userId = new UserId();        new User($userId, '[e-mail]', 'password'); DomainEventPublisher::instance()->unsubscribe($id); ...