magento-test/app/code/Magento/Widget/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">
    <type name="Magento\Widget\Model\Config\Reader">
        <arguments>
            <argument name="fileName" xsi:type="string">widget.xml</argument>
            <argument name="schemaLocator" xsi:type="object">Magento\Widget\Model\Config\SchemaLocator</argument>
            <argument name="fileResolver" xsi:type="object">Magento\Widget\Model\Config\FileResolver</argument>
        </arguments>
    </type>
    <type name="Magento\Widget\Model\Config\Data">
        <arguments>
            <argument name="reader" xsi:type="object">Magento\Widget\Model\Config\Reader\Proxy</argument>
            <argument name="cacheId" xsi:type="string">widget_config</argument>
        </arguments>
    </type>
    <type name="Magento\Widget\Model\ResourceModel\Layout\Update">
        <arguments>
            <argument name="cache" xsi:type="object">Magento\Framework\App\Cache\Type\Layout</argument>
        </arguments>
    </type>
    <type name="Magento\Cms\Model\Template\FilterProvider">
        <arguments>
            <argument name="pageFilter" xsi:type="string">Magento\Widget\Model\Template\Filter</argument>
            <argument name="blockFilter" xsi:type="string">Magento\Widget\Model\Template\Filter</argument>
        </arguments>
    </type>
    <type name="Magento\Framework\View\Model\Layout\Merge">
        <plugin name="widget-layout-update-plugin"
                type="Magento\Widget\Model\ResourceModel\Layout\Plugin" sortOrder="10"/>
    </type>
    <virtualType name="WidgetValidationState" type="\Magento\Framework\Config\ValidationState\Configurable">
        <arguments>
            <argument name="required" xsi:type="boolean">true</argument>
        </arguments>
    </virtualType>
    <virtualType name="WidgetXmlValidator" type="\Magento\Framework\View\Model\Layout\Update\Validator">
        <arguments>
            <argument name="validationState" xsi:type="object">WidgetValidationState</argument>
        </arguments>
    </virtualType>
    <virtualType name="WidgetXmlValidatorFactory" type="Magento\Framework\View\Model\Layout\Update\ValidatorFactory">
        <arguments>
            <argument name="instanceName" xsi:type="string">WidgetXmlValidator</argument>
        </arguments>
    </virtualType>
    <type name="Magento\Widget\Model\Widget\Instance">
        <arguments>
            <argument name="xmlValidatorFactory" xsi:type="object">WidgetXmlValidatorFactory</argument>
        </arguments>
    </type>
</config>