magento-test/app/code/Magento/Tax/Test/Mftf/ActionGroup/AdminSelectTaxRateActionGroup.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="AdminSelectTaxRateActionGroup">
        <annotations>
            <description>Select "Tax Rate" in tax rule edit form.</description>
        </annotations>
        <arguments>
            <argument name="taxRate" type="string" defaultValue="{{TaxRateTexas.code}}"/>
        </arguments>

        <fillField selector="{{AdminTaxRuleFormSection.taxRateSearch}}" userInput="{{taxRate}}" stepKey="searchTaxRate"/>
        <waitForPageLoad time="30" stepKey="waitForAjaxLoad"/>
        <waitForElementVisible selector="{{AdminTaxRuleFormSection.taxRateOption(taxRate)}}" time="30" stepKey="waitForVisibleTaxRate" />
        <click selector="{{AdminTaxRuleFormSection.taxRateOption(taxRate)}}" stepKey="clickTaxRate"/>
    </actionGroup>
</actionGroups>