magento-test/app/code/Magento/UrlRewrite/Test/Mftf/ActionGroup/AssertPageByUrlRewriteIsNotFoundActionGroup.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="AssertPageByUrlRewriteIsNotFoundActionGroup">
        <annotations>
            <description>Validates that the provided Request Path does NOT exist on the Storefront. Validates that the 'Whoops' message is present and correct.</description>
        </annotations>
        <arguments>
            <argument name="requestPath" type="string"/>
        </arguments>

        <amOnPage url="{{requestPath}}" stepKey="amOnPage"/>
        <waitForPageLoad stepKey="waitForStorefrontPageLoad"/>
        <see userInput="Whoops, our bad..." stepKey="seeWhoops"/>
    </actionGroup>
</actionGroups>