sales_order.php

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<?php
$customer = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(
    \Magento\Customer\Model\Customer::class
)->load(
    1
);

$order = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(
    \Magento\Sales\Model\Order::class
)->loadByIncrementId(
    '100000001'
);
$order->setCustomerIsGuest(false)->setCustomerId($customer->getId())->setCustomerEmail($customer->getEmail());
$order->save();