magento-test/app/code/Magento/Checkout/Test/Mftf/ActionGroup/CheckBillingAddressInCheckoutActionGroup.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="CheckBillingAddressInCheckoutActionGroup">
        <annotations>
            <description>Validates that the provided Customer and Address details are present on the Storefront Checkout page under the 'Payment Method' section.</description>
        </annotations>
        <arguments>
            <argument name="customerVar"/>
            <argument name="customerAddressVar"/>
        </arguments>

        <waitForElement selector="{{CheckoutPaymentSection.paymentSectionTitle}}" time="30" stepKey="waitForPaymentSectionLoaded"/>
        <see userInput="{{customerVar.firstName}}" selector="{{CheckoutPaymentSection.billingAddress}}" stepKey="assertBillingAddressFirstName"/>
        <see userInput="{{customerVar.lastName}}" selector="{{CheckoutPaymentSection.billingAddress}}" stepKey="assertBillingAddressLastName"/>
        <see userInput="{{customerAddressVar.street[0]}}" selector="{{CheckoutPaymentSection.billingAddress}}" stepKey="assertBillingAddressStreet"/>
        <see userInput="{{customerAddressVar.city}}" selector="{{CheckoutPaymentSection.billingAddress}}" stepKey="assertBillingAddressCity"/>
        <see userInput="{{customerAddressVar.state}}" selector="{{CheckoutPaymentSection.billingAddress}}" stepKey="assertBillingAddressState"/>
        <see userInput="{{customerAddressVar.postcode}}" selector="{{CheckoutPaymentSection.billingAddress}}" stepKey="assertBillingAddressPostcode"/>
        <see userInput="{{customerAddressVar.telephone}}" selector="{{CheckoutPaymentSection.billingAddress}}" stepKey="assertBillingAddressTelephone"/>
    </actionGroup>
</actionGroups>