Add missing header.

tests/TestCase/TestSuite/Fixture/TransactionStrategyTest.php

@@ -1,6 +1,19 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
+ * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
+ *
+ * Licensed under The MIT License
+ * For full copyright and license information, please see the LICENSE.txt
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright     Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
+ * @link          https://cakephp.org CakePHP(tm) Project
+ * @since         4.3.0
+ * @license       https://opensource.org/licenses/mit-license.php MIT License
+ */
 namespace Cake\Test\TestCase\TestSuite;
 
 use Cake\ORM\TableRegistry;