magento-test/app/code/Magento/MediaGalleryUi/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\MediaGalleryUiApi\Api\ConfigInterface" type="Magento\MediaGalleryUi\Model\Config"/>
    <preference for="Magento\MediaGalleryUiApi\Api\Data\InsertImageDataInterface" type="\Magento\MediaGalleryUi\Model\InsertImageData"/>
    <type name="Magento\Framework\View\Element\UiComponent\DataProvider\CollectionFactory">
        <arguments>
            <argument name="collections" xsi:type="array">
                <item name="media_gallery_listing_data_source" xsi:type="string">Magento\MediaGalleryUi\Ui\Component\Listing\Provider</item>
            </argument>
        </arguments>
    </type>
    <virtualType name="mediaGallerySearchResult" type="Magento\Framework\View\Element\UiComponent\DataProvider\SearchResult">
        <arguments>
            <argument name="mainTable" xsi:type="string">media_gallery_asset_grid</argument>
            <argument name="resourceModel" xsi:type="string">Magento\MediaGalleryUi\Model\ResourceModel\Grid\Asset</argument>
        </arguments>
    </virtualType>
    <type name="Magento\Cms\Model\Wysiwyg\Images\Storage">
        <arguments>
            <argument name="resizeParameters" xsi:type="array">
                <item name="height" xsi:type="number">200</item>
                <item name="width" xsi:type="number">200</item>
            </argument>
        </arguments>
    </type>
    <type name="Magento\MediaGallerySynchronizationApi\Model\ImportFilesComposite">
        <plugin name="createMediaGalleryThumbnails" type="Magento\MediaGalleryUi\Plugin\CreateThumbnails"/>
    </type>
</config>