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<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
use Magento\TestFramework\Workaround\Override\Fixture\Resolver;

Resolver::getInstance()->requireDataFixture('Magento/Sales/_files/order.php');

$objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
/** @var \Magento\Sales\Model\Order $order */
$order = $objectManager->create(\Magento\Sales\Model\Order::class);
$order->loadByIncrementId('100000001')->setBaseToGlobalRate(2)->save();

/** @var \Magento\Tax\Model\Sales\Order\Tax $tax */
$tax = $objectManager->create(\Magento\Tax\Model\Sales\Order\Tax::class);
$tax->setData(
    [
        'order_id' => $order->getId(),
        'code' => 'tax_code',
        'title' => 'Tax Title',
        'hidden' => 0,
        'percent' => 10,
        'priority' => 1,
        'position' => 1,
        'amount' => 10,
        'base_amount' => 10,
        'process' => 1,
        'base_real_amount' => 10,
    ]
);
$tax->save();