magento-test/app/code/Magento/Config/Test/Mftf/ActionGroup/DisabledWYSIWYGActionGroup.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="DisabledWYSIWYGActionGroup">
        <annotations>
            <description>Disables the WYSIWYG Editor via the CLI.</description>
        </annotations>

        <magentoCLI stepKey="disableWYSIWYG" command="config:set cms/wysiwyg/enabled disabled"/>
    </actionGroup>
</actionGroups>