order_alphanumeric_id.php

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

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

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