magento-test/app/code/Magento/Customer/Test/Mftf/ActionGroup/AdminCreateCustomerGroupActionGroup.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="AdminCreateCustomerGroupActionGroup">
        <annotations>
            <description>Goes to the Customer Groups creation page. Fills Name. Selects Tax Class. Clicks on Save. Validate that the Success Message is present and correct.</description>
        </annotations>
        <arguments>
            <argument name="groupName" type="string"/>
            <argument name="taxClass" type="string"/>
        </arguments>
        
        <amOnPage url="{{AdminNewCustomerGroupPage.url}}" stepKey="goToNewCustomerGroupPage"/>
        <waitForPageLoad stepKey="waitForNewCustomerGroupPageLoad"/>

        <!--Set tax class for customer group-->
        <fillField stepKey="fillGroupName" selector="{{AdminNewCustomerGroupSection.groupName}}" userInput="{{groupName}}"/>
        <selectOption selector="{{AdminNewCustomerGroupSection.taxClass}}" userInput="{{taxClass}}" stepKey="selectTaxClassOption"/>
        <click selector="{{AdminNewCustomerGroupSection.saveCustomerGroup}}" stepKey="clickToSaveCustomerGroup"/>
        <waitForPageLoad stepKey="waitForCustomerGroupSaved"/>
        <see stepKey="seeCustomerGroupSaveMessage" userInput="You saved the customer group."/>
    </actionGroup>
</actionGroups>