magento-test/app/code/Magento/Checkout/Test/Mftf/ActionGroup/StorefrontCheckoutClickNextButtonActionGroup.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="StorefrontCheckoutClickNextButtonActionGroup">
        <annotations>
            <description>Clicks on the 'Next' button on checkout.</description>
        </annotations>

        <waitForElementVisible selector="{{CheckoutShippingMethodsSection.next}}" stepKey="waitForNextButton"/>
        <waitForPageLoad stepKey="waitForPageLoad"/>
        <waitForElementClickable selector="{{CheckoutShippingMethodsSection.next}}" stepKey="waitForNextButtonClickable"/>
        <click selector="{{CheckoutShippingMethodsSection.next}}" stepKey="clickOnNextButton"/>
        <waitForPageLoad stepKey="waitForPageLoad2"/>
    </actionGroup>
</actionGroups>