magento-test/app/code/Magento/Quote/Test/Mftf/Data/GuestCartData.xml

<?xml version="1.0" encoding="UTF-8"?>

<!--
 /**
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
-->

<entities xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:mftf:DataGenerator/etc/dataProfileSchema.xsd">

    <entity name="GuestCart" type="GuestCart">
    </entity>

    <entity name="GuestAddressInformation" type="AddressInformation">
        <var key="quote_id" entityKey="return" entityType="GuestCart"/>
        <requiredEntity type="shipping_address">ShippingAddressTX</requiredEntity>
        <requiredEntity type="billing_address">BillingAddressTX</requiredEntity>
        <data key="shipping_method_code">flatrate</data>
        <data key="shipping_carrier_code">flatrate</data>
    </entity>

    <entity name="GuestOrderPaymentMethod" type="PaymentInformation">
        <requiredEntity type="payment_method">PaymentMethodCheckMoneyOrder</requiredEntity>
        <requiredEntity type="billing_address">BillingAddressTX</requiredEntity>
    </entity>

    <entity name="OrderId" type="orderId">
           <var key="order_id" entityKey="return" entityType="orderId"/>
    </entity>
</entities>