magento-test/app/code/Magento/Config/Test/Mftf/ActionGroup/SelectCountriesWithRequiredRegionActionGroup.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="SelectCountriesWithRequiredRegionActionGroup">
        <annotations>
            <description>Goes to the 'Configuration' page for 'General'. Selects the provided Countries under 'State is Required for'. Clicks on the Save button.</description>
        </annotations>
        <arguments>
            <argument name="countries" type="entity"/>
        </arguments>

        <amOnPage url="{{AdminConfigGeneralPage.url}}" stepKey="navigateToAdminConfigGeneralPage"/>
        <conditionalClick selector="{{StateOptionsSection.stateOptions}}" dependentSelector="{{StateOptionsSection.countriesWithRequiredRegions}}" visible="false" stepKey="expandStateOptionsTab"/>
        <waitForAjaxLoad stepKey="waitForAjax"/>
        <scrollTo selector="{{StateOptionsSection.countriesWithRequiredRegions}}" stepKey="scrollToForm"/>
        <selectOption selector="{{StateOptionsSection.countriesWithRequiredRegions}}" parameterArray="[{{countries.country}}]" stepKey="selectCountriesWithRequiredRegion"/>
        <click selector="#save" stepKey="saveConfig"/>
        <waitForPageLoad stepKey="waitForSavingConfig"/>
    </actionGroup>
</actionGroups>