magento-test/app/code/Magento/Checkout/Test/Mftf/ActionGroup/StorefrontGuestCheckoutProceedToPaymentStepActionGroup.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="StorefrontGuestCheckoutProceedToPaymentStepActionGroup">
        <annotations>
            <description>Clicks next on Checkout Shipping step. Waits for Payment step</description>
        </annotations>

        <click selector="{{CheckoutShippingGuestInfoSection.next}}" stepKey="clickNext"/>
        <waitForElement selector="{{CheckoutPaymentSection.paymentSectionTitle}}" stepKey="waitForPaymentSectionLoaded" after="clickNext"/>
        <seeInCurrentUrl url="{{CheckoutPage.url}}/#payment" stepKey="assertCheckoutPaymentUrl"/>
    </actionGroup>
</actionGroups>