DOMPDFModule\View\Strategy\PdfStrategy::detach PHP Method

    public function detach(EventManagerInterface $events)
    {
        foreach ($this->listeners as $index => $listener) {
            if ($events->detach($listener)) {
                unset($this->listeners[$index]);
            }
        }
    }

 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');
 }