magento-test/app/code/Magento/Checkout/Test/Mftf/ActionGroup/GoToCheckoutFromCartActionGroup.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="GoToCheckoutFromCartActionGroup">
        <annotations>
            <description>Clicks on the 'View and Edit Cart' link in the Storefront Mini Shopping Cart. Validates that the Storefront Shopping Cart URL is present and correct. Clicks on 'Proceed to Checkout'.</description>
        </annotations>

        <waitForElementNotVisible selector="{{StorefrontMinicartSection.emptyCart}}" stepKey="waitUpdateQuantity"/>
        <click selector="{{StorefrontMinicartSection.showCart}}" stepKey="clickCart"/>
        <waitForLoadingMaskToDisappear stepKey="waitForLoadingMask"/>
        <seeInCurrentUrl url="{{CheckoutCartPage.url}}" stepKey="assertCheckoutCartUrl"/>
        <click selector="{{CheckoutCartSummarySection.proceedToCheckout}}" stepKey="goToCheckout"/>
    </actionGroup>
</actionGroups>