public function hasListeners($eventName)
 {
     return $this->eventDispatcher->hasListeners($eventName);
 }
 public function testHasListenersWithoutEventsReturnsFalseAfterHasListenersWithEventHasBeenCalled()
 {
     $this->assertFalse($this->dispatcher->hasListeners('foo'));
     $this->assertFalse($this->dispatcher->hasListeners());
 }