diff --git a/tests/Models/NullEmployee.php b/tests/Models/NullEmployee.php
deleted file mode 100644
index 01ddad3..0000000
--- a/tests/Models/NullEmployee.php
+++ /dev/null
@@ -1,42 +0,0 @@
-<?php
-/**
- * Orange Management
- *
- * PHP Version 8.0
- *
- * @package   tests
- * @copyright Dennis Eichhorn
- * @license   OMS License 1.0
- * @version   1.0.0
- * @link      https://orange-management.org
- */
-declare(strict_types=1);
-
-namespace Modules\HumanResourceManagement\tests\Models;
-
-use Modules\HumanResourceManagement\Models\NullEmployee;
-
-/**
- * @internal
- */
-final class Null extends \PHPUnit\Framework\TestCase
-{
-    /**
-     * @covers Modules\HumanResourceManagement\Models\NullEmployee
-     * @group framework
-     */
-    public function testNull() : void
-    {
-        self::assertInstanceOf('\Modules\HumanResourceManagement\Models\Employee', new NullEmployee());
-    }
-
-    /**
-     * @covers Modules\HumanResourceManagement\Models\NullEmployee
-     * @group framework
-     */
-    public function testId() : void
-    {
-        $null = new NullEmployee(2);
-        self::assertEquals(2, $null->getId());
-    }
-}
diff --git a/tests/Models/NullEmployeeEducationHistory.php b/tests/Models/NullEmployeeEducationHistory.php
deleted file mode 100644
index c82cd38..0000000
--- a/tests/Models/NullEmployeeEducationHistory.php
+++ /dev/null
@@ -1,42 +0,0 @@
-<?php
-/**
- * Orange Management
- *
- * PHP Version 8.0
- *
- * @package   tests
- * @copyright Dennis Eichhorn
- * @license   OMS License 1.0
- * @version   1.0.0
- * @link      https://orange-management.org
- */
-declare(strict_types=1);
-
-namespace Modules\HumanResourceManagement\tests\Models;
-
-use Modules\HumanResourceManagement\Models\NullEmployeeEducationHistory;
-
-/**
- * @internal
- */
-final class Null extends \PHPUnit\Framework\TestCase
-{
-    /**
-     * @covers Modules\HumanResourceManagement\Models\NullEmployeeEducationHistory
-     * @group framework
-     */
-    public function testNull() : void
-    {
-        self::assertInstanceOf('\Modules\HumanResourceManagement\Models\EmployeeEducationHistory', new NullEmployeeEducationHistory());
-    }
-
-    /**
-     * @covers Modules\HumanResourceManagement\Models\NullEmployeeEducationHistory
-     * @group framework
-     */
-    public function testId() : void
-    {
-        $null = new NullEmployeeEducationHistory(2);
-        self::assertEquals(2, $null->getId());
-    }
-}
diff --git a/tests/Models/NullEmployeeHistory.php b/tests/Models/NullEmployeeHistory.php
deleted file mode 100644
index fab7c08..0000000
--- a/tests/Models/NullEmployeeHistory.php
+++ /dev/null
@@ -1,42 +0,0 @@
-<?php
-/**
- * Orange Management
- *
- * PHP Version 8.0
- *
- * @package   tests
- * @copyright Dennis Eichhorn
- * @license   OMS License 1.0
- * @version   1.0.0
- * @link      https://orange-management.org
- */
-declare(strict_types=1);
-
-namespace Modules\HumanResourceManagement\tests\Models;
-
-use Modules\HumanResourceManagement\Models\NullEmployeeHistory;
-
-/**
- * @internal
- */
-final class Null extends \PHPUnit\Framework\TestCase
-{
-    /**
-     * @covers Modules\HumanResourceManagement\Models\NullEmployeeHistory
-     * @group framework
-     */
-    public function testNull() : void
-    {
-        self::assertInstanceOf('\Modules\HumanResourceManagement\Models\EmployeeHistory', new NullEmployeeHistory());
-    }
-
-    /**
-     * @covers Modules\HumanResourceManagement\Models\NullEmployeeHistory
-     * @group framework
-     */
-    public function testId() : void
-    {
-        $null = new NullEmployeeHistory(2);
-        self::assertEquals(2, $null->getId());
-    }
-}
diff --git a/tests/Models/NullEmployeeWorkHistory.php b/tests/Models/NullEmployeeWorkHistory.php
deleted file mode 100644
index 151d0c2..0000000
--- a/tests/Models/NullEmployeeWorkHistory.php
+++ /dev/null
@@ -1,42 +0,0 @@
-<?php
-/**
- * Orange Management
- *
- * PHP Version 8.0
- *
- * @package   tests
- * @copyright Dennis Eichhorn
- * @license   OMS License 1.0
- * @version   1.0.0
- * @link      https://orange-management.org
- */
-declare(strict_types=1);
-
-namespace Modules\HumanResourceManagement\tests\Models;
-
-use Modules\HumanResourceManagement\Models\NullEmployeeWorkHistory;
-
-/**
- * @internal
- */
-final class Null extends \PHPUnit\Framework\TestCase
-{
-    /**
-     * @covers Modules\HumanResourceManagement\Models\NullEmployeeWorkHistory
-     * @group framework
-     */
-    public function testNull() : void
-    {
-        self::assertInstanceOf('\Modules\HumanResourceManagement\Models\EmployeeWorkHistory', new NullEmployeeWorkHistory());
-    }
-
-    /**
-     * @covers Modules\HumanResourceManagement\Models\NullEmployeeWorkHistory
-     * @group framework
-     */
-    public function testId() : void
-    {
-        $null = new NullEmployeeWorkHistory(2);
-        self::assertEquals(2, $null->getId());
-    }
-}