magento-test/app/code/Magento/Newsletter/Test/Mftf/ActionGroup/StorefrontCreateNewSubscriberActionGroup.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="StorefrontCreateNewSubscriberActionGroup" deprecated="Use StorefrontCreateNewsletterSubscriberActionGroup">
        <!-- Deprecated Due to inconsistency with the best practices -->
        <amOnPage url="{{StorefrontHomePage.url}}" stepKey="amOnStorefrontPage"/>
        <submitForm selector="{{BasicFrontendNewsletterFormSection.subscribeForm}}"
                    parameterArray="['email' => '{{_defaultNewsletter.senderEmail}}']"
                    button="{{BasicFrontendNewsletterFormSection.subscribeButton}}" stepKey="submitForm"/>
        <waitForPageLoad stepKey="waitForPageLoad"/>
        <waitForElementVisible stepKey="waitForErrorAppears" selector="{{StorefrontMessagesSection.error}}"/>
    </actionGroup>
</actionGroups>