magento-test/app/code/Magento/Customer/Test/Mftf/Section/CustomersPageSection.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="CustomersPageSection">
        <element name="addNewCustomerButton" type="button" selector="//*[@id='add']"/>
        <element name="customerCheckbox" type="button" selector="//*[contains(text(),'{{args}}')]/parent::td/preceding-sibling::td/label[@class='data-grid-checkbox-cell-inner']" parameterized="true"/>
        <element name="actions" type="button" selector="//div[@class='col-xs-2']/div[@class='action-select-wrap']/button[@class='action-select']" timeout="30"/>
        <element name="delete" type="button" selector="//*[contains(@class,'admin__data-grid-header-row row row-gutter')]//*[text()='Delete']" timeout="30"/>
        <element name="ok" type="button" selector="//button[@data-role='action']//span[text()='OK']" timeout="30"/>
        <element name="actionItem" type="button" selector="//div[@class='admin__data-grid-outer-wrap']/div[@class='admin__data-grid-header']//span[text()='{{actionItem}}']" parameterized="true" timeout="30"/>
        <element name="assignGroup" type="button" selector="//div[@class='admin__data-grid-outer-wrap']/div[@class='admin__data-grid-header']//ul[@class='action-submenu _active']//span[text()='{{groupName}}']" parameterized="true"/>
        <element name="deletedSuccessMessage" type="button" selector="//*[@class='message message-success success']"/>
    </section>
</sections>