magento-test/app/code/Magento/Contact/Test/Mftf/ActionGroup/AssertMessageContactUsFormActionGroup.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="AssertMessageContactUsFormActionGroup">
        <annotations>
            <description>Validates that the provided Message appears in the correct Message Type on the Storefront 'Contact Us' page.</description>
        </annotations>
        <arguments>
            <argument name="message" type="string" defaultValue="Thanks for contacting us with your comments and questions. We'll respond to you very soon."/>
            <argument name="messageType" type="string" defaultValue="success"/>
        </arguments>
        
        <see userInput="{{message}}" selector="{{StorefrontContactUsMessagesSection.messageByType(messageType)}}" stepKey="verifyMessage"/>
    </actionGroup>
</actionGroups>