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

use Magento\Framework\Api\SearchCriteriaBuilder;
use Magento\Quote\Api\CartManagementInterface;
use Magento\Quote\Api\CartRepositoryInterface;
use Magento\TestFramework\Helper\Bootstrap;

/** @var SearchCriteriaBuilder $searchCriteriaBuilder */
$searchCriteriaBuilder = Bootstrap::getObjectManager()->get(SearchCriteriaBuilder::class);
/** @var CartRepositoryInterface $cartRepository */
$cartRepository = Bootstrap::getObjectManager()->get(CartRepositoryInterface::class);
/** @var CartManagementInterface $cartManagement */
$cartManagement = Bootstrap::getObjectManager()->get(CartManagementInterface::class);

$searchCriteria = $searchCriteriaBuilder
    ->addFilter('reserved_order_id', 'in_store_pickup_test_order')
    ->create();
$cart = current($cartRepository->getList($searchCriteria)->getItems());

$cartManagement->placeOrder($cart->getId());