magento-test/app/code/Magento/ConfigurableProduct/etc/frontend/di.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:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\ConfigurableProduct\Model\ResourceModel\Attribute\OptionSelectBuilderInterface">
        <plugin name="Magento_ConfigurableProduct_Plugin_Model_ResourceModel_Attribute_InStockOptionSelectBuilder" type="Magento\ConfigurableProduct\Plugin\Model\ResourceModel\Attribute\InStockOptionSelectBuilder"/>
        <plugin name="option_select_website_filter" type="Magento\ConfigurableProduct\Plugin\Model\ResourceModel\Attribute\ScopedOptionSelectBuilder"/>
    </type>
    <type name="Magento\ConfigurableProduct\Model\Product\Type\Configurable">
        <plugin name="used_products_cache" type="Magento\ConfigurableProduct\Model\Plugin\Frontend\UsedProductsCache" />
        <plugin name="used_products_website_filter" type="Magento\ConfigurableProduct\Model\Plugin\Frontend\UsedProductsWebsiteFilter" />
    </type>
    <type name="Magento\ConfigurableProduct\Pricing\Price\ConfigurableOptionsCompositeFilter">
        <arguments>
            <argument name="configurableOptionsFilters" xsi:type="array">
                <item name="status" xsi:type="object">Magento\ConfigurableProduct\Pricing\Price\ConfigurableOptionsStatusFilter</item>
                <item name="stock_status" xsi:type="object">Magento\ConfigurableProduct\Pricing\Price\ConfigurableOptionsStockStatusFilter</item>
            </argument>
        </arguments>
    </type>
</config>