magento-test/app/code/Magento/Cms/Test/Mftf/ActionGroup/AdminOpenContentMenuTabActionGroup.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="AdminOpenContentMenuTabActionGroup">
        <annotations>
            <description>Open tab 'Content' on main menu.</description>
        </annotations>
        <conditionalClick selector="{{AdminMenuSection.menuItem('magento-backend-content')}}" dependentSelector="{{AdminMenuSection.contentMenuClose}}" visible="false" stepKey="openContentTab"/>
    </actionGroup>
</actionGroups>