magento-test/app/code/Magento/CurrencySymbol/Test/Mftf/ActionGroup/AdminSetBaseCurrencyActionGroup.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">
    <!-- Set base currency -->
    <actionGroup name="AdminSetBaseCurrencyActionGroup" extends="AdminSaveConfigActionGroup">
        <arguments>
            <argument name="currency" type="string"/>
        </arguments>
        <uncheckOption selector="{{CurrencySetupSection.baseCurrencyUseDefault}}" before="clickSaveConfigBtn" stepKey="uncheckUseDefaultOption"/>
        <selectOption selector="{{CurrencySetupSection.baseCurrency}}" userInput="{{currency}}" after="uncheckUseDefaultOption" stepKey="setBaseCurrencyField"/>
    </actionGroup>
</actionGroups>