magento-test/app/code/Magento/Checkout/Test/Mftf/ActionGroup/StorefrontCartEstimateShippingAndTaxActionGroup.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">
    <!-- Fill Estimate Shipping and Tax fields -->
    <actionGroup name="StorefrontCartEstimateShippingAndTaxActionGroup">
        <annotations>
            <description>Fills in the provided Address details (Country, State and Zip Code) under the 'Summary' section on the Storefront Shopping Cart page.</description>
        </annotations>
        <arguments>
            <argument name="estimateAddress" defaultValue="EstimateAddressCalifornia"/>
        </arguments>

        <conditionalClick selector="{{CheckoutCartSummarySection.estimateShippingAndTax}}" dependentSelector="{{CheckoutCartSummarySection.country}}" visible="false" stepKey="clickOnEstimateShippingAndTax"/>
        <waitForElementVisible selector="{{CheckoutCartSummarySection.country}}" stepKey="waitForCountrySelectorIsVisible"/>
        <selectOption selector="{{CheckoutCartSummarySection.country}}" userInput="{{estimateAddress.country}}" stepKey="selectCountry"/>
        <waitForLoadingMaskToDisappear stepKey="waitForCountryLoadingMaskDisappear"/>
        <selectOption selector="{{CheckoutCartSummarySection.stateProvince}}" userInput="{{estimateAddress.state}}" stepKey="selectStateProvince"/>
        <waitForLoadingMaskToDisappear stepKey="waitForStateLoadingMaskDisappear"/>
        <fillField selector="{{CheckoutCartSummarySection.postcode}}" userInput="{{estimateAddress.zipCode}}" stepKey="fillZipPostalCodeField"/>
        <waitForLoadingMaskToDisappear stepKey="waitForZipLoadingMaskDisappear"/>
    </actionGroup>
</actionGroups>