magento-test/app/code/Magento/Customer/Test/Mftf/ActionGroup/AssertSignedUpNewsletterActionGroup.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="AssertSignedUpNewsletterActionGroup">
        <annotations>
            <description>Validates that the provided Customer details are present and correct on the Storefront Customer Dashboard page.</description>
        </annotations>
        <arguments>
            <argument name="customer" defaultValue="CustomerEntityOne"/>
            <argument name="storeName" defaultValue="Main Website" type="string"/>
        </arguments>

        <see stepKey="successMessage" userInput="Thank you for registering with {{storeName}} Store." selector="{{AdminCustomerMessagesSection.successMessage}}"/>
        <see stepKey="seeFirstName" userInput="{{customer.firstname}}" selector="{{StorefrontCustomerDashboardAccountInformationSection.ContactInformation}}"/>
        <see stepKey="seeLastName" userInput="{{customer.lastname}}" selector="{{StorefrontCustomerDashboardAccountInformationSection.ContactInformation}}"/>
        <see stepKey="seeEmail" userInput="{{customer.email}}" selector="{{StorefrontCustomerDashboardAccountInformationSection.ContactInformation}}"/>
        <seeInCurrentUrl url="{{StorefrontCustomerDashboardPage.url}}" stepKey="seeAssertInCurrentUrl"/>
    </actionGroup>
</actionGroups>