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<?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\Model\Order;
use Magento\TestFramework\Helper\Bootstrap;
use Magento\TestFramework\Workaround\Override\Fixture\Resolver;
use Magento\Sales\Api\OrderManagementInterface;

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

$objectManager = Bootstrap::getObjectManager();
/** @var Order $order */
$order = $objectManager->get(OrderInterfaceFactory::class)->create()->loadByIncrementId('100000001');
/** @var OrderManagementInterface $orderManagement */
$orderManagement = $objectManager->create(OrderManagementInterface::class);
$orderManagement->place($order);
$orderManagement->cancel($order->getEntityId());