public function testProtectedApiClose_ClosesSocket()
{
$listener = $this->createListener();
$component = $this->createComponent();
$server = $this->createSocketServer($listener, $component);
$socket = $this->getMock(SocketInterface::class, [], [], '', false);
$socket->expects($this->once())->method('close');
$this->callProtectedMethod($server, 'close', [$socket]);
}