magento-test/app/code/Magento/Sales/Test/Mftf/Section/AdminOrderCommentsTabSection.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="AdminOrderCommentsTabSection">
        <element name="orderNotesList" type="text" selector="div[aria-labelledby='sales_order_view_tabs_order_history'] .edit-order-comments .note-list"/>
        <element name="orderComments" type="text" selector="div[aria-labelledby='sales_order_view_tabs_order_history'] .edit-order-comments-block"/>
        <element name="orderComment" type="text" selector="div[aria-labelledby='sales_order_view_tabs_order_history'] .comments-block-item-comment"/>
    </section>
</sections>