<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
declare(strict_types=1);

use Magento\Sales\Api\Data\OrderInterfaceFactory;
use Magento\Sales\Api\ShipOrderInterface;
use Magento\Sales\Model\Order;
use Magento\TestFramework\Helper\Bootstrap;
use Magento\TestFramework\Workaround\Override\Fixture\Resolver;

Resolver::getInstance()->requireDataFixture('Magento/Sales/_files/customer_order_with_two_items.php');

$objectManager = Bootstrap::getObjectManager();
/** @var Order $order */
$order = $objectManager->get(OrderInterfaceFactory::class)->create()->loadByIncrementId('100000555');
/** @var ShipOrderInterface $invoiceOrder */
$shipOrder = $objectManager->get(ShipOrderInterface::class);

$shipOrder->execute($order->getId());