public function testEventSubscribers()
{
$manager = new EventManager();
$this->assertCount(0, $manager->getListeners(ViewEvent::EVENT_RENDERER), 'Renderer listener before attach');
$this->assertCount(0, $manager->getListeners(ViewEvent::EVENT_RESPONSE), 'Response listener before attach');
$this->strategy->attach($manager);
$this->assertCount(1, $manager->getListeners(ViewEvent::EVENT_RENDERER), 'Renderer listener after attach');
$this->assertCount(1, $manager->getListeners(ViewEvent::EVENT_RESPONSE), 'Response listener after attach');
$this->strategy->detach($manager);
$this->assertCount(0, $manager->getListeners(ViewEvent::EVENT_RENDERER), 'Renderer listener after detach');
$this->assertCount(0, $manager->getListeners(ViewEvent::EVENT_RESPONSE), 'Response listener after detach');
}