magento-test/app/code/Magento/Checkout/Test/Mftf/ActionGroup/StorefrontAssertCartShippingMethodSelectedActionGroup.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">
    <!-- Assert Shipping Method Is Checked on Cart -->
    <actionGroup name="StorefrontAssertCartShippingMethodSelectedActionGroup">
        <annotations>
            <description>Validates that the provided Shipping Method Carrier/Method Code is checked on the Storefront Shopping Cart page.</description>
        </annotations>
        <arguments>
            <argument name="carrierCode" type="string"/>
            <argument name="methodCode" type="string"/>
        </arguments>
        
        <seeCheckboxIsChecked selector="{{CheckoutCartSummarySection.shippingMethodElementId(carrierCode, methodCode)}}" stepKey="assertShippingMethodIsChecked"/>
    </actionGroup>
</actionGroups>