magento-test/app/code/Magento/MediaContentSynchronization/etc/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">
    <preference for="Magento\MediaContentSynchronizationApi\Api\SynchronizeInterface" type="Magento\MediaContentSynchronization\Model\Synchronize"/>
    <preference for="Magento\MediaContentSynchronizationApi\Api\SynchronizeIdentitiesInterface" type="Magento\MediaContentSynchronization\Model\SynchronizeIdentities"/>
    <type name="Magento\Framework\Console\CommandListInterface">
        <arguments>
            <argument name="commands" xsi:type="array">
                <item name="mediaContentSynchronization" xsi:type="object">Magento\MediaContentSynchronization\Console\Command\Synchronize</item>
            </argument>
        </arguments>
    </type>
    <type name="Magento\MediaGallerySynchronization\Model\Consume">
        <plugin name="synchronize_media_content"
                type="Magento\MediaContentSynchronization\Plugin\SynchronizeMediaContent"/>
    </type>
</config>