magento-test/app/code/Magento/Contact/Test/Mftf/ActionGroup/StorefrontAssertEmailAddressTrimmedActionGroup.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="StorefrontAssertEmailAddressTrimmedActionGroup">
        <annotations>
            <description>Validate that the provided email address is trimmed from spaces in the given input.</description>
        </annotations>
        <arguments>
            <argument name="inputSelector" type="string" defaultValue="input[name='email']"/>
            <argument name="emailAddressWithSpaces" type="string" defaultValue="John.Doe@example.com "/>
        </arguments>

        <executeJS function="return '{{emailAddressWithSpaces}}'.trim();" stepKey="trimEmail"/>

        <grabValueFrom selector="{{inputSelector}}" stepKey="grabEmailFromInput"/>

        <assertEquals stepKey="assertEmailsAreEqual">
            <expectedResult type="string">$trimEmail</expectedResult>
            <actualResult type="string">$grabEmailFromInput</actualResult>
        </assertEquals>
    </actionGroup>
</actionGroups>