public function testRemoveListener()
{
$dispatcher = new EventDispatcher();
$listener = new TestListener();
$dispatcher->addListener($listener);
$dispatcher->removeListener($listener);
$this->assertEmpty($dispatcher->getListeners());
$this->assertFalse($dispatcher->hasListener($listener));
$dispatcher->addListener($listener);
$dispatcher->removeAllListeners();
$this->assertEmpty($dispatcher->getListeners());
}
