Fix namespace

tests/TestCase/TestSuite/AssertHtmlTest.php

@@ -14,7 +14,7 @@ declare(strict_types=1);
  * @since         3.0.0
  * @license       https://opensource.org/licenses/mit-license.php MIT License
  */
-namespace Cake\Test\TestSuite;
+namespace Cake\Test\TestCase\TestSuite;
 
 use Cake\TestSuite\TestCase;
 use PHPUnit\Framework\ExpectationFailedException;