diff --git a/tests/Admin/AdminTest.php b/tests/Admin/AdminTest.php
index 83d2413..05ce4cd 100755
--- a/tests/Admin/AdminTest.php
+++ b/tests/Admin/AdminTest.php
@@ -17,7 +17,7 @@ namespace Modules\News\tests\Admin;
 /**
  * @internal
  */
-class AdminTest extends \PHPUnit\Framework\TestCase
+final class AdminTest extends \PHPUnit\Framework\TestCase
 {
     protected const NAME = 'News';
 
diff --git a/tests/Controller/ApiControllerTest.php b/tests/Controller/ApiControllerTest.php
index 86d07b5..4a9d73f 100755
--- a/tests/Controller/ApiControllerTest.php
+++ b/tests/Controller/ApiControllerTest.php
@@ -32,7 +32,7 @@ use phpOMS\Utils\TestUtils;
  *
  * @internal
  */
-class ControllerTest extends \PHPUnit\Framework\TestCase
+final class ControllerTest extends \PHPUnit\Framework\TestCase
 {
     protected $app    = null;
 
diff --git a/tests/Models/NewsArticleMapperTest.php b/tests/Models/NewsArticleMapperTest.php
index f63b266..5d0e1f6 100755
--- a/tests/Models/NewsArticleMapperTest.php
+++ b/tests/Models/NewsArticleMapperTest.php
@@ -27,7 +27,7 @@ use phpOMS\Utils\RnG\Text;
  *
  * @internal
  */
-class NewsArticleMapperTest extends \PHPUnit\Framework\TestCase
+final class NewsArticleMapperTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * @testdox The model can be created and read from the database
diff --git a/tests/Models/NewsArticleTest.php b/tests/Models/NewsArticleTest.php
index a778a88..d2516b7 100755
--- a/tests/Models/NewsArticleTest.php
+++ b/tests/Models/NewsArticleTest.php
@@ -25,7 +25,7 @@ use phpOMS\Localization\ISO639x1Enum;
  *
  * @internal
  */
-class NewsArticleTest extends \PHPUnit\Framework\TestCase
+final class NewsArticleTest extends \PHPUnit\Framework\TestCase
 {
     protected NewsArticle $news;