MC-39561: setup-integration test fail with Area code "adminhtml" does not exist.

Author: engcom-Foxtrot

dev/tests/setup-integration/etc/di/preferences/cli/ce.php

@@ -4,6 +4,10 @@
  * See COPYING.txt for license details.
  */
 
+use Magento\Framework as MF;
+use Magento\TestFramework as TF;
+
 return [
-    '\Magento\Framework\Mview\TriggerCleaner' => '\Magento\TestFramework\Mview\DummyTriggerCleaner',
+    MF\App\AreaList::class => TF\App\AreaList::class,
+    MF\Mview\TriggerCleaner::class => TF\Mview\DummyTriggerCleaner::class,
 ];

dev/tests/setup-integration/framework/Magento/TestFramework/App/AreaList.php

@@ -0,0 +1,37 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\TestFramework\App;
+
+use Magento\Framework\App\Area\FrontNameResolverFactory;
+use Magento\Framework\ObjectManagerInterface;
+
+/**
+ * Stub for \Magento\Framework\App\AreaList
+ */
+class AreaList extends \Magento\Framework\App\AreaList
+{
+    /**
+     * @param ObjectManagerInterface $objectManager
+     * @param FrontNameResolverFactory $resolverFactory
+     * @param array $areas
+     * @param string|null $default
+     */
+    public function __construct(
+        ObjectManagerInterface $objectManager,
+        FrontNameResolverFactory $resolverFactory,
+        array $areas = [],
+        $default = null
+    ) {
+        parent::__construct($objectManager, $resolverFactory, $areas, $default);
+        /**
+         * Then Magento is installed for setup-integration tests, di.xml files are parsed from all Magento modules,
+         * causing Magento\Framework\App\AreaList _areas property to be filled with arguments from disabled modules.
+         */
+        $this->_areas = [];
+    }
+}