Fix CS.

tests/test_app/TestApp/Stub/CaseStatementExpressionStub.php

@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 namespace Cake\Test\test_app\TestApp\Stub;
 

tests/test_app/TestApp/Stub/WhenThenExpressionStub.php

@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 namespace Cake\Test\test_app\TestApp\Stub;