magento-test/app/code/Magento/MediaGalleryUi/Test/Mftf/ActionGroup/AdminEnhancedMediaGalleryVerifyImageDescriptionActionGroup.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
 /**
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
-->

<actionGroups xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:noNamespaceSchemaLocation="urn:magento:mftf:Test/etc/actionGroupSchema.xsd">
    <actionGroup name="AdminEnhancedMediaGalleryVerifyImageDescriptionActionGroup">
        <annotations>
            <description>Verifies image description on the View Details panel</description>
        </annotations>
        <arguments>
            <argument name="description"/>
        </arguments>

        <grabTextFrom selector="{{AdminEnhancedMediaGalleryViewDetailsSection.description}}" stepKey="grabDescription"/>
        <assertStringContainsString stepKey="verifyDescription">
            <actualResult type="variable">grabDescription</actualResult>
            <expectedResult type="string">{{description}}</expectedResult>
        </assertStringContainsString>
    </actionGroup>
</actionGroups>