Event::getListeners PHP Method

        public static function getListeners($eventName)
        {
            return \Illuminate\Events\Dispatcher::getListeners($eventName);
        }

 public function testDetach()
 {
     $event = new Event('test');
     $listener = $this->getMock('\\SplObserver');
     $event->attach($listener);
     $event->detach($listener);
     $this->assertCount(0, $event->getListeners());
 }