magento-test/app/code/Magento/Checkout/Test/Mftf/ActionGroup/CheckoutFillEstimateShippingAndTaxActionGroup.xml

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

<actionGroups xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:noNamespaceSchemaLocation="urn:magento:mftf:Test/etc/actionGroupSchema.xsd">
    <actionGroup name="CheckoutFillEstimateShippingAndTaxActionGroup">
        <arguments>
            <argument name="address" defaultValue="US_Address_TX" type="entity"/>
        </arguments>
        <conditionalClick selector="{{CheckoutCartSummarySection.estimateShippingAndTax}}" dependentSelector="{{CheckoutCartSummarySection.estimateShippingAndTaxSummary}}" visible="false" stepKey="openShippingDetails"/>
        <waitForElementVisible selector="{{CheckoutCartSummarySection.country}}" stepKey="waitForSummarySectionLoad"/>
        <selectOption selector="{{CheckoutCartSummarySection.country}}" userInput="{{address.country_id}}" stepKey="selectCountry"/>
        <selectOption selector="{{CheckoutCartSummarySection.stateProvince}}" userInput="{{address.state}}" stepKey="selectState"/>
        <waitForElementVisible selector="{{CheckoutCartSummarySection.postcode}}" stepKey="waitForPostCodeVisible"/>
        <fillField selector="{{CheckoutCartSummarySection.postcode}}" userInput="{{address.postcode}}" stepKey="selectPostCode"/>
        <waitForPageLoad stepKey="waitForLoadingMaskToDiappear"/>
    </actionGroup>
</actionGroups>