magento-test/app/code/Magento/ProductAlert/etc/email_templates.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Email:etc/email_templates.xsd">
    <template id="catalog_productalert_email_stock_template" label="Stock Alert" file="stock_alert.html" type="html" module="Magento_ProductAlert" area="frontend"/>
    <template id="catalog_productalert_email_price_template" label="Price Alert" file="price_alert.html" type="html" module="Magento_ProductAlert" area="frontend"/>
    <template id="catalog_productalert_cron_error_email_template" label="Cron Error Warning" file="cron_error.html" type="text" module="Magento_ProductAlert" area="adminhtml"/>
</config>