magento-test/app/code/Magento/Tax/Test/Mftf/Section/CheckoutCartSummarySection.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
 /**
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
-->

<sections xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="urn:magento:mftf:Page/etc/SectionObject.xsd">
    <section name="CheckoutCartSummarySection">
        <element name="taxAmount" type="text" selector="[data-th='Tax']>span"/>
        <element name="taxSummary" type="text" selector=".totals-tax-summary"/>
        <element name="rate" type="text" selector=" tr.totals-tax-details.shown th.mark"/>
        <element name="subtotalExcludingTax" type="text" selector="#cart-totals .totals.sub.excl span.price"/>
        <element name="subtotalIncludingTax" type="text" selector="#cart-totals .totals.sub.incl span.price"/>
    </section>
</sections>