public function testApiRemoveListener_RemovesListener_ForOnceListeners(EventEmitterInterface $emitter)
{
$never = $this->expectCallableNever();
$once = $this->expectCallableOnce();
$emitter->once('test', $never);
$emitter->once('test', $once);
$emitter->removeListener('test', $never);
$emitter->emit('test');
}