StorfrontMiniCartSection.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="StorefrontMinicartSection">
        <element name="itemQuantity" type="input" selector="//a[text()='{{productName}}']/../..//input[contains(@class,'cart-item-qty')]" parameterized="true"/>
        <element name="itemQuantityUpdate" type="button" selector="//a[text()='{{productName}}']/../..//span[text()='Update']" parameterized="true"/>
    </section>
</sections>