magento-test/app/code/Magento/Cms/Test/Mftf/ActionGroup/AdminSaveAndDuplicateCMSPageWithSplitButtonActionGroup.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="AdminSaveAndDuplicateCMSPageWithSplitButtonActionGroup">
        <annotations>
            <description>Clicks on the Save and Duplicate button.</description>
        </annotations>

        <waitForElementVisible selector="{{CmsNewPagePageActionsSection.expandSplitButton}}" stepKey="waitForExpandSplitButtonToBeVisible"/>
        <click selector="{{CmsNewPagePageActionsSection.expandSplitButton}}"  stepKey="expandSplitBtn2" />
        <click selector="{{CmsNewPagePageActionsSection.saveAndDuplicate}}" stepKey="clickSaveAndDuplicate" />
        <waitForPageLoad stepKey="waitForPageLoadAfterClickingSaveAndDuplicate"/>
        <see userInput="You saved the page." stepKey="seeSavedPageMsgOnForm"/>
        <see userInput="You duplicated the page." stepKey="seeDuplicatedPageMsg"/>
    </actionGroup>
</actionGroups>