invoice_fixture_store_order.php

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<?php
require 'order_fixture_store.php';
$orderService = \Magento\TestFramework\ObjectManager::getInstance()->create(
    \Magento\Sales\Api\InvoiceManagementInterface::class
);
$invoice = $orderService->prepareInvoice($order);
$invoice->register();
$order = $invoice->getOrder();
$order->setIsInProcess(true);
$transactionSave = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()
    ->create(\Magento\Framework\DB\Transaction::class);
$transactionSave->addObject($invoice)->addObject($order)->save();