magento-test/app/code/Magento/Customer/Test/Mftf/Data/CustomerGroupData.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="NotLoggedInCustomerGroup" type="customerGroup">
        <data key="id">0</data>
        <data key="code">NOT LOGGED IN</data>
        <data key="tax_class_id">3</data>
        <data key="tax_class_name">Retail Customer</data>
    </entity>
    <entity name="GeneralCustomerGroup" type="customerGroup">
        <data key="code">General</data>
        <data key="tax_class_id">3</data>
        <data key="tax_class_name">Retail Customer</data>
    </entity>
    <entity name="CustomerGroupChange" type="customerGroup">
        <data key="code" unique="suffix">Group_</data>
        <data key="tax_class_id">3</data>
        <data key="tax_class_name">Retail Customer</data>
    </entity>
    <entity name="DefaultCustomerGroup" type="customerGroup">
        <array key="group_names">
            <item>General</item>
        </array>
    </entity>
    <entity name="CustomCustomerGroup" type="customerGroup">
        <data key="code" unique="suffix">Group-</data>
        <data key="tax_class_id">3</data>
        <data key="tax_class_name">Retail Customer</data>
    </entity>
</entities>