magento-test/app/code/Magento/Sales/Test/Mftf/ActionGroup/SubmitCreditMemoActionGroup.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="SubmitCreditMemoActionGroup">
        <arguments>
            <argument name="refundButton" defaultValue="{{AdminCreditMemoTotalSection.submitRefundOfflineEnabled}}" type="string"/>
        </arguments>
        <grabFromCurrentUrl regex="~/order_id/(\d+)/~" stepKey="grabOrderId"/>
        <waitForElementVisible selector="{{refundButton}}" stepKey="waitButtonEnabled"/>
        <click selector="{{refundButton}}" stepKey="clickSubmitCreditMemo"/>
        <waitForElementVisible selector="{{AdminMessagesSection.success}}" stepKey="waitForMessageAppears"/>
        <see selector="{{AdminMessagesSection.success}}" userInput="You created the credit memo." stepKey="seeCreditMemoCreateSuccess"/>
        <seeInCurrentUrl url="{{AdminOrderDetailsPage.url}}$grabOrderId" stepKey="seeViewOrderPageCreditMemo"/>
    </actionGroup>
</actionGroups>