order_with_customer_and_multiple_order_items.php

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<?php
declare(strict_types=1);

include __DIR__ . '/order_with_multiple_items.php';
include __DIR__ . '/../../../Magento/Customer/_files/customer.php';

$customerIdFromFixture = 1;
$order->setCustomerId($customerIdFromFixture)->setCustomerIsGuest(false)->save();