diff --git a/tests/Admin/AdminTest.php b/tests/Admin/AdminTest.php
index 106e745..1f87492 100755
--- a/tests/Admin/AdminTest.php
+++ b/tests/Admin/AdminTest.php
@@ -17,7 +17,7 @@ namespace Modules\ProjectManagement\tests\Admin;
 /**
  * @internal
  */
-class AdminTest extends \PHPUnit\Framework\TestCase
+final class AdminTest extends \PHPUnit\Framework\TestCase
 {
     protected const NAME = 'ProjectManagement';
 
diff --git a/tests/Models/ProjectMapperTest.php b/tests/Models/ProjectMapperTest.php
index 2d8805c..5ed495d 100755
--- a/tests/Models/ProjectMapperTest.php
+++ b/tests/Models/ProjectMapperTest.php
@@ -26,7 +26,7 @@ use phpOMS\Utils\RnG\Text;
 /**
  * @internal
  */
-class ProjectMapperTest extends \PHPUnit\Framework\TestCase
+final class ProjectMapperTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * @covers Modules\ProjectManagement\Models\ProjectMapper
diff --git a/tests/Models/ProjectTest.php b/tests/Models/ProjectTest.php
index 9de91c3..4da2b74 100755
--- a/tests/Models/ProjectTest.php
+++ b/tests/Models/ProjectTest.php
@@ -23,7 +23,7 @@ use phpOMS\Localization\Money;
 /**
  * @internal
  */
-class ProjectTest extends \PHPUnit\Framework\TestCase
+final class ProjectTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * @covers Modules\ProjectManagement\Models\Project