magento-test/app/code/Magento/Checkout/Test/Mftf/ActionGroup/GuestCheckoutFillNewShippingAddressActionGroup.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="GuestCheckoutFillNewShippingAddressActionGroup">
        <annotations>
            <description>Fills in the provided Customer/Address details in the 'Shipping Address' section on the Storefront Checkout page.</description>
        </annotations>
        <arguments>
            <argument name="customer" type="entity"/>
            <argument name="address" type="entity"/>
        </arguments>

        <fillField selector="{{CheckoutShippingSection.email}}" userInput="{{customer.email}}" stepKey="fillEmailField"/>
        <fillField selector="{{CheckoutShippingSection.firstName}}" userInput="{{customer.firstName}}" stepKey="fillFirstName"/>
        <fillField selector="{{CheckoutShippingSection.lastName}}" userInput="{{customer.lastName}}" stepKey="fillLastName"/>
        <fillField selector="{{CheckoutShippingSection.street}}" userInput="{{address.street}}" stepKey="fillStreet"/>
        <fillField selector="{{CheckoutShippingSection.city}}" userInput="{{address.city}}" stepKey="fillCity"/>
        <selectOption selector="{{CheckoutShippingSection.region}}" userInput="{{address.state}}" stepKey="selectRegion"/>
        <fillField selector="{{CheckoutShippingSection.postcode}}" userInput="{{address.postcode}}" stepKey="fillZipCode"/>
        <fillField selector="{{CheckoutShippingSection.telephone}}" userInput="{{address.telephone}}" stepKey="fillPhone"/>
    </actionGroup>
</actionGroups>