magento-test/app/code/Magento/ReviewGraphQl/etc/graphql/di.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\StoreGraphQl\Model\Resolver\Store\StoreConfigDataProvider">
        <arguments>
            <argument name="extendedConfigData" xsi:type="array">
                <item name="product_reviews_enabled" xsi:type="string">catalog/review/active</item>
                <item name="allow_guests_to_write_product_reviews" xsi:type="string">catalog/review/allow_guest</item>
            </argument>
        </arguments>
    </type>
</config>