magento-test/app/code/Magento/Cms/Test/Mftf/Data/BlockPageData.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
 /**
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
-->

<entities xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:mftf:DataGenerator/etc/dataProfileSchema.xsd">
    <entity name="_defaultBlock" type="block">
        <data key="title" unique="suffix">Default Block</data>
        <data key="identifier" unique="suffix" >block</data>
        <data key="content">Here is a block test. Yeah!</data>
        <data key="active">true</data>
    </entity>
</entities>