diff --git a/tests/Admin/AdminTest.php b/tests/Admin/AdminTest.php
index 042cc7d..3eda2d5 100755
--- a/tests/Admin/AdminTest.php
+++ b/tests/Admin/AdminTest.php
@@ -17,7 +17,7 @@ namespace Modules\Tasks\tests\Admin;
 /**
  * @internal
  */
-class AdminTest extends \PHPUnit\Framework\TestCase
+final class AdminTest extends \PHPUnit\Framework\TestCase
 {
     protected const NAME = 'Tasks';
 
diff --git a/tests/BackendControllerTest.php b/tests/BackendControllerTest.php
index d1e8420..daaa325 100755
--- a/tests/BackendControllerTest.php
+++ b/tests/BackendControllerTest.php
@@ -29,7 +29,7 @@ use phpOMS\Utils\TestUtils;
 /**
  * @internal
  */
-class BackendControllerTest extends \PHPUnit\Framework\TestCase
+final class BackendControllerTest extends \PHPUnit\Framework\TestCase
 {
     protected $app    = null;
 
diff --git a/tests/ControllerTest.php b/tests/ControllerTest.php
index 68f95a9..d3c8c1d 100755
--- a/tests/ControllerTest.php
+++ b/tests/ControllerTest.php
@@ -34,7 +34,7 @@ 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/AccountRelationTest.php b/tests/Models/AccountRelationTest.php
index a24af59..5edc830 100755
--- a/tests/Models/AccountRelationTest.php
+++ b/tests/Models/AccountRelationTest.php
@@ -21,7 +21,7 @@ use Modules\Tasks\Models\DutyType;
 /**
  * @internal
  */
-class AccountRelationTest extends \PHPUnit\Framework\TestCase
+final class AccountRelationTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * @covers Modules\Tasks\Models\AccountRelation
diff --git a/tests/Models/GroupRelationTest.php b/tests/Models/GroupRelationTest.php
index 2f03506..2b78da2 100755
--- a/tests/Models/GroupRelationTest.php
+++ b/tests/Models/GroupRelationTest.php
@@ -21,7 +21,7 @@ use Modules\Tasks\Models\GroupRelation;
 /**
  * @internal
  */
-class GroupRelationTest extends \PHPUnit\Framework\TestCase
+final class GroupRelationTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * @covers Modules\Tasks\Models\GroupRelation
diff --git a/tests/Models/TaskElementTest.php b/tests/Models/TaskElementTest.php
index fe41cbe..b3ae0dd 100755
--- a/tests/Models/TaskElementTest.php
+++ b/tests/Models/TaskElementTest.php
@@ -23,7 +23,7 @@ use Modules\Tasks\Models\TaskStatus;
 /**
  * @internal
  */
-class TaskElementTest extends \PHPUnit\Framework\TestCase
+final class TaskElementTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * @covers Modules\Tasks\Models\TaskElement
diff --git a/tests/Models/TaskMapperTest.php b/tests/Models/TaskMapperTest.php
index 37a64e6..a08863f 100755
--- a/tests/Models/TaskMapperTest.php
+++ b/tests/Models/TaskMapperTest.php
@@ -27,7 +27,7 @@ use phpOMS\Utils\RnG\Text;
 /**
  * @internal
  */
-class TaskMapperTest extends \PHPUnit\Framework\TestCase
+final class TaskMapperTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * @covers Modules\Tasks\Models\TaskMapper
diff --git a/tests/Models/TaskTest.php b/tests/Models/TaskTest.php
index e001c1c..ff28467 100755
--- a/tests/Models/TaskTest.php
+++ b/tests/Models/TaskTest.php
@@ -25,7 +25,7 @@ use Modules\Tasks\Models\TaskType;
 /**
  * @internal
  */
-class TaskTest extends \PHPUnit\Framework\TestCase
+final class TaskTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * @covers Modules\Tasks\Models\Task