magento-test/app/code/Magento/Cms/Test/Mftf/ActionGroup/AssertCMSPageStoreIdActionGroup.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="AssertCMSPageStoreIdActionGroup">
        <arguments>
            <argument name="storeId" type="string"/>
        </arguments>
        <click selector="{{CmsNewPagePiwSection.header}}" stepKey="clickPageInWebsites"/>
        <waitForElementVisible selector="{{CmsNewPagePiwSection.storeIdDropdown}}" stepKey="waitForStoresSectionReload"/>
        <grabValueFrom selector="{{CmsNewPagePiwSection.storeIdDropdown}}"  stepKey="grabValueFromStoreView"/>
        <assertEquals stepKey="assertTitle" message="pass">
            <expectedResult type="string">{{storeId}}</expectedResult>
            <actualResult type="variable">grabValueFromStoreView</actualResult>
        </assertEquals>
    </actionGroup>
</actionGroups>