magento-test/app/code/Magento/Sales/Test/Mftf/ActionGroup/GoToInvoiceIntoOrderActionGroup.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="GoToInvoiceIntoOrderActionGroup">
        <annotations>
            <description>Clicks on 'Invoice' on the Admin Orders view page. Validates that the URL and Page Title are correct.</description>
        </annotations>

        <click selector="{{AdminOrderDetailsMainActionsSection.invoice}}" stepKey="clickInvoiceAction"/>
        <seeInCurrentUrl url="{{AdminInvoiceNewPage.url}}" stepKey="seeOrderInvoiceUrl"/>
        <see selector="{{AdminHeaderSection.pageTitle}}" userInput="New Invoice" stepKey="seePageNameNewInvoicePage"/>
    </actionGroup>
</actionGroups>