MC-24840: Infinite redirect in case of backend URL is different from default website URL

Author: OlgaVasyltsun

dev/tests/integration/testsuite/Magento/Backend/App/Area/FrontNameResolverTest.php

@@ -0,0 +1,49 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+declare(strict_types=1);
+
+namespace Magento\Backend\App\Area;
+
+use PHPUnit\Framework\TestCase;
+use Magento\TestFramework\Helper\Bootstrap;
+
+/**
+ * @magentoAppArea adminhtml
+ */
+class FrontNameResolverTest extends TestCase
+{
+    /**
+     * @var \Magento\Framework\ObjectManagerInterface
+     */
+    protected $objectManager;
+
+    /**
+     * @var FrontNameResolver
+     */
+    protected $model;
+
+    /**
+     * @inheritDoc
+     */
+    protected function setUp(): void
+    {
+        $this->objectManager = Bootstrap::getObjectManager();
+        $this->model = $this->objectManager->create(
+            FrontNameResolver::class
+        );
+        $_SERVER['HTTP_HOST'] = 'localhost';
+    }
+
+    /**
+     * @magentoDbIsolation enabled
+     * @magentoConfigFixture current_store web/unsecure/base_url http://example.com/
+     */
+    public function testIsHostBackend()
+    {
+        $this->assertTrue($this->model->isHostBackend());
+    }
+}