magento-test/app/code/Magento/Newsletter/Test/Mftf/ActionGroup/StorefrontCreateNewAccountNewsletterUncheckedActionGroup.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="StorefrontCreateNewAccountNewsletterUncheckedActionGroup" extends="SignUpNewUserFromStorefrontActionGroup">
        <annotations>
            <description>EXTENDS: SignUpNewUserFromStorefrontActionGroup. Validates that the you are NOT subscribed message is present and correct.</description>
        </annotations>
        <arguments>
            <argument name="Customer"/>
            <argument name="Store"/>
            <argument name="StoreGroup"/>
        </arguments>

        <amOnPage stepKey="amOnStorefrontPage" url="{{Store.code}}"/>
        <see stepKey="seeDescriptionNewsletter" userInput="You aren't subscribed to our newsletter." selector="{{CustomerMyAccountPage.DescriptionNewsletter}}"/>
        <see stepKey="seeThankYouMessage" userInput="Thank you for registering with {{StoreGroup.name}}."/>
    </actionGroup>
</actionGroups>