ACP2E-1381: Different behaviors on snake_case formatting

Author: viktym

dev/tests/integration/testsuite/Magento/Framework/Api/Fixture/DataObject.php

@@ -1,5 +1,8 @@
 <?php
-
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
 declare(strict_types=1);
 
 namespace Magento\Framework\Api\Fixture;

dev/tests/integration/testsuite/Magento/Framework/Api/Fixture/DataObjectInterface.php

@@ -1,5 +1,8 @@
 <?php
-
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
 declare(strict_types=1);
 
 namespace Magento\Framework\Api\Fixture;