magento-test/app/code/Magento/Newsletter/Test/Mftf/ActionGroup/StorefrontCreateNewAccountNewsletterCheckedActionGroup.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">
    <!--Create an Account. Check Sign Up for Newsletter checkbox -->
    <actionGroup name="StorefrontCreateNewAccountNewsletterCheckedActionGroup" extends="SignUpNewUserFromStorefrontActionGroup">
        <annotations>
            <description>EXTENDS: SignUpNewUserFromStorefrontActionGroup. Clicks on 'Sign Up for Newsletter'. Validates that the Subscription Confirmation message is present and correct.</description>
        </annotations>

        <click selector="{{StorefrontCustomerCreateFormSection.signUpForNewsletter}}" stepKey="selectSignUpForNewsletterCheckbox" after="fillLastName"/>
        <see stepKey="seeDescriptionNewsletter" userInput='You are subscribed to "General Subscription".' selector="{{CustomerMyAccountPage.DescriptionNewsletter}}"/>
    </actionGroup>
</actionGroups>