magento-test/app/code/Magento/Sitemap/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\Sitemap\Model\SitemapItemInterface" type="Magento\Sitemap\Model\SitemapItem" />
    <preference for="Magento\Sitemap\Model\ItemProvider\ItemProviderInterface" type="Magento\Sitemap\Model\ItemProvider\Composite" />
    <preference for="Magento\Sitemap\Model\SitemapConfigReaderInterface" type="Magento\Sitemap\Model\SitemapConfigReader" />

    <type name="Magento\Sitemap\Model\Sitemap">
        <arguments>
            <argument name="resource" xsi:type="object">Magento\Sitemap\Model\ResourceModel\Sitemap</argument>
        </arguments>
    </type>
    <type name="Magento\Config\Model\Config\TypePool">
        <arguments>
            <argument name="sensitive" xsi:type="array">
                <item name="sitemap/generate/error_email" xsi:type="string">1</item>
            </argument>
        </arguments>
    </type>
    <type name="Magento\Sitemap\Model\ItemProvider\Composite">
        <arguments>
            <argument name="itemProviders" xsi:type="array">
                <item name="storeUrlProvider" xsi:type="object">Magento\Sitemap\Model\ItemProvider\StoreUrl</item>
                <item name="categoryProvider" xsi:type="object">Magento\Sitemap\Model\ItemProvider\Category</item>
                <item name="cmsPageProvider" xsi:type="object">Magento\Sitemap\Model\ItemProvider\CmsPage</item>
                <item name="productProvider" xsi:type="object">Magento\Sitemap\Model\ItemProvider\Product</item>
            </argument>
        </arguments>
    </type>
    <type name="Magento\Sitemap\Model\ItemProvider\StoreUrl">
        <arguments>
            <argument name="configReader" xsi:type="object">Magento\Sitemap\Model\ItemProvider\StoreUrlConfigReader</argument>
        </arguments>
    </type>
    <type name="Magento\Sitemap\Model\ItemProvider\Category">
        <arguments>
            <argument name="configReader" xsi:type="object">Magento\Sitemap\Model\ItemProvider\CategoryConfigReader</argument>
        </arguments>
    </type>
    <type name="Magento\Sitemap\Model\ItemProvider\Product">
        <arguments>
            <argument name="configReader" xsi:type="object">Magento\Sitemap\Model\ItemProvider\ProductConfigReader</argument>
        </arguments>
    </type>
    <type name="Magento\Sitemap\Model\ItemProvider\CmsPage">
        <arguments>
            <argument name="configReader" xsi:type="object">Magento\Sitemap\Model\ItemProvider\CmsPageConfigReader</argument>
        </arguments>
    </type>
    <type name="Magento\Cms\Model\Wysiwyg\Images\Storage">
        <arguments>
            <argument name="dirs" xsi:type="array">
                <item name="exclude" xsi:type="array">
                    <item name="sitemap" xsi:type="array">
                        <item name="regexp" xsi:type="boolean">true</item>
                        <item name="name" xsi:type="string">media[/\\]+sitemap[/\\]*$</item>
                    </item>
                </item>
            </argument>
        </arguments>
    </type>
</config>