<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

require __DIR__ . '/../../../Magento/Sales/_files/order.php';

/** @var \Magento\Sales\Model\Order $order */
$order = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(\Magento\Sales\Model\Order::class);

$order->loadByIncrementId('100000001');
$order->setIncrementId('M00000001');
$order->save();
