diff --git a/Controller/ApiController.php b/Controller/ApiController.php
index 959f3af..511f173 100755
--- a/Controller/ApiController.php
+++ b/Controller/ApiController.php
@@ -1,5 +1,4 @@
 <?php
-
 /**
  * Orange Management
  *
@@ -11,7 +10,6 @@
  * @version   1.0.0
  * @link      https://orange-management.org
  */
-
 declare(strict_types=1);
 
 namespace Modules\Admin\Controller;
diff --git a/tests/Controller/Api/ApiControllerAccountTrait.php b/tests/Controller/Api/ApiControllerAccountTrait.php
index a281a31..9b40deb 100755
--- a/tests/Controller/Api/ApiControllerAccountTrait.php
+++ b/tests/Controller/Api/ApiControllerAccountTrait.php
@@ -14,6 +14,7 @@ declare(strict_types=1);
 
 namespace Modules\Admin\tests\Controller\Api;
 
+use phpOMS\Account\GroupStatus;
 use phpOMS\Account\AccountStatus;
 use phpOMS\Account\AccountType;
 use phpOMS\Message\Http\HttpRequest;
@@ -177,7 +178,7 @@ trait ApiControllerAccountTrait
      * @covers Modules\Admin\Controller\ApiController
      * @group module
      */
-    public function testApiAddGroupToAccount() : void
+    public function testApiAddRemoveGroupToAccount() : void
     {
         $response = new HttpResponse();
         $request  = new HttpRequest(new HttpUri(''));
@@ -188,5 +189,79 @@ trait ApiControllerAccountTrait
 
         $this->module->apiAddGroupToAccount($request, $response);
         self::assertEquals('ok', $response->get('')['status']);
+
+        // remove
+        $response = new HttpResponse();
+
+        $this->module->apiDeleteGroupFromAccount($request, $response);
+        self::assertEquals('ok', $response->get('')['status']);
+    }
+
+    /**
+     * @covers Modules\Admin\Controller\ApiController
+     * @group module
+     */
+    public function testApiRemoveAdminGroupFromOneselfAccount() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('account', 1);
+        $request->setData('igroup-idlist', '3');
+
+        $this->module->apiDeleteGroupFromAccount($request, $response);
+        self::assertEquals('error', $response->get('')['status']);
+    }
+
+    /**
+     * @covers Modules\Admin\Controller\ApiController
+     * @group module
+     */
+    public function testApiAccountLogin() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('user', 'admin');
+        $request->setData('pass', 'orange');
+
+        $this->module->apiLogin($request, $response);
+        self::assertInstanceOf('\phpOMS\Model\Message\Reload', $response->get(''));
+    }
+
+    /**
+     * @covers Modules\Admin\Controller\ApiController
+     * @group module
+     */
+    public function testApiAccountLoginInvalid() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('user', 'admin');
+        $request->setData('pass', 'invalid');
+
+        $this->module->apiLogin($request, $response);
+        self::assertInstanceOf('\phpOMS\Model\Message\Notify', $response->get(''));
+    }
+
+    /**
+     * @covers Modules\Admin\Controller\ApiController
+     * @group module
+     */
+    public function testApiAccountLogout() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('user', 'admin');
+        $request->setData('pass', 'invalid');
+
+        $this->module->apiLogout($request, $response);
+        self::assertEquals('ok', $response->get('')['status']);
     }
 }
diff --git a/tests/Controller/Api/ApiControllerGroupTrait.php b/tests/Controller/Api/ApiControllerGroupTrait.php
index dc0f107..e4ab3c3 100755
--- a/tests/Controller/Api/ApiControllerGroupTrait.php
+++ b/tests/Controller/Api/ApiControllerGroupTrait.php
@@ -109,6 +109,23 @@ trait ApiControllerGroupTrait
         self::assertGreaterThan(0, $response->get('')['response']->getId());
     }
 
+    /**
+     * @testdox A user group can be created and deleted
+     * @covers Modules\Admin\Controller\ApiController
+     * @group module
+     */
+    public function testApiGroupDeleteAdminInvalid() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+
+        $request->setData('id', '3');
+        $this->module->apiGroupDelete($request, $response);
+        self::assertEquals('error', $response->get('')['status']);
+    }
+
     /**
      * @testdox A invalid user group cannot be created
      * @covers Modules\Admin\Controller\ApiController
@@ -132,7 +149,7 @@ trait ApiControllerGroupTrait
      * @covers Modules\Admin\Controller\ApiController
      * @group module
      */
-    public function testApiAddAccountToGroup() : void
+    public function testApiAddRemoveAccountToGroup() : void
     {
         $response = new HttpResponse();
         $request  = new HttpRequest(new HttpUri(''));
@@ -143,6 +160,29 @@ trait ApiControllerGroupTrait
 
         $this->module->apiAddAccountToGroup($request, $response);
         self::assertEquals('ok', $response->get('')['status']);
+
+        // remove
+        $response = new HttpResponse();
+
+        $this->module->apiDeleteAccountFromGroup($request, $response);
+        self::assertEquals('ok', $response->get('')['status']);
+    }
+
+    /**
+     * @covers Modules\Admin\Controller\ApiController
+     * @group module
+     */
+    public function testApiRemoveAdminAccountFromAdminGroup() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('group', 3);
+        $request->setData('iaccount-idlist', '1');
+
+        $this->module->apiDeleteAccountFromGroup($request, $response);
+        self::assertEquals('error', $response->get('')['status']);
     }
 
     /**
diff --git a/tests/Controller/Api/ApiControllerPermissionTrait.php b/tests/Controller/Api/ApiControllerPermissionTrait.php
index b6ead4c..c5c7222 100755
--- a/tests/Controller/Api/ApiControllerPermissionTrait.php
+++ b/tests/Controller/Api/ApiControllerPermissionTrait.php
@@ -42,6 +42,23 @@ trait ApiControllerPermissionTrait
         self::assertGreaterThan(0, $response->get('')['response']->getId());
     }
 
+    /**
+     * @covers Modules\Admin\Controller\ApiController
+     * @group module
+     */
+    public function testApiAddGroupPermissionToAdmin() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('permissionowner', PermissionOwner::GROUP);
+        $request->setData('permissionref', 3);
+
+        $this->module->apiAddGroupPermission($request, $response);
+        self::assertEquals('error', $response->get('')['status']);
+    }
+
     /**
      * @testdox A group permission can be returned
      * @covers Modules\Admin\Controller\ApiController
diff --git a/tests/Controller/ApiControllerTest.php b/tests/Controller/ApiControllerTest.php
index 489a5af..8f0766d 100755
--- a/tests/Controller/ApiControllerTest.php
+++ b/tests/Controller/ApiControllerTest.php
@@ -22,6 +22,7 @@ use Modules\Admin\tests\Controller\Api\ApiControllerGroupTrait;
 use Modules\Admin\tests\Controller\Api\ApiControllerModuleTrait;
 use Modules\Admin\tests\Controller\Api\ApiControllerPermissionTrait;
 use Modules\Admin\tests\Controller\Api\ApiControllerSettingsTrait;
+use phpOMS\DataStorage\Session\HttpSession;
 use phpOMS\Account\Account;
 use phpOMS\Account\AccountManager;
 use phpOMS\Account\PermissionType;
@@ -65,6 +66,7 @@ class ApiControllerTest extends \PHPUnit\Framework\TestCase
         $this->app->dispatcher     = new Dispatcher($this->app);
         $this->app->eventManager   = new EventManager($this->app->dispatcher);
         $this->app->eventManager->importFromFile(__DIR__ . '/../../../../Web/Api/Hooks.php');
+        $this->app->sessionManager = new HttpSession(36000);
 
         $account = new Account();
         TestUtils::setMember($account, 'id', 1);
diff --git a/tests/Models/AccountMapperTest.php b/tests/Models/AccountMapperTest.php
index e074caa..09b22bb 100755
--- a/tests/Models/AccountMapperTest.php
+++ b/tests/Models/AccountMapperTest.php
@@ -149,4 +149,15 @@ class AccountMapperTest extends \PHPUnit\Framework\TestCase
         $accountR->generatePassword('orange');
         AccountMapper::update($accountR);
     }
+
+    /**
+     * @covers Modules\Admin\Models\AccountMapper
+     * @group module
+     */
+    public function testGetWithPermission() : void
+    {
+        $accountR = AccountMapper::getWithPermissions(1);
+        self::assertEquals('admin', $accountR->login);
+        self::assertGreaterThan(0, $accountR->getPermissions());
+    }
 }
diff --git a/tests/Models/AddressMapperTest.php b/tests/Models/AddressMapperTest.php
new file mode 100644
index 0000000..150073a
--- /dev/null
+++ b/tests/Models/AddressMapperTest.php
@@ -0,0 +1,59 @@
+<?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\Admin\tests\Models;
+
+use Modules\Admin\Models\Address;
+use Modules\Admin\Models\AddressMapper;
+use phpOMS\Utils\TestUtils;
+use phpOMS\Stdlib\Base\AddressType;
+
+/**
+ * @testdox Modules\Admin\tests\Models\AddressMapperTest: Address database mapper
+ *
+ * @internal
+ */
+class AddressMapperTest extends \PHPUnit\Framework\TestCase
+{
+	/**
+     * @covers Modules\Admin\Models\AddressMapper
+     * @group module
+     */
+	public function testCR() : void
+    {
+        $address = new Address();
+
+        $address->name = 'name';
+        $address->addition = 'addition';
+        $address->postal = '0123456789';
+        $address->setType(AddressType::BUSINESS);
+        $address->city    = 'city';
+        $address->address = 'Some address here';
+        $address->state   = 'This is a state 123';
+        $address->setCountry('DE');
+        $address->setGeo(['lat' => 12.1, 'long' => 11.2,]);
+
+        $id = AddressMapper::create($address);
+        self::assertGreaterThan(0, $address->getId());
+        self::assertEquals($id, $address->getId());
+
+        $addressR = AddressMapper::get($address->getId());
+        self::assertEquals($address->name, $addressR->name);
+        self::assertEquals($address->addition, $addressR->addition);
+        self::assertEquals($address->getType(), $addressR->getType());
+        self::assertEquals($address->postal, $addressR->postal);
+        self::assertEquals($address->address, $addressR->address);
+        self::assertEquals($address->state, $addressR->state);
+    }
+}
\ No newline at end of file
diff --git a/tests/Models/AddressTest.php b/tests/Models/AddressTest.php
new file mode 100644
index 0000000..21b6666
--- /dev/null
+++ b/tests/Models/AddressTest.php
@@ -0,0 +1,141 @@
+<?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\Admin\tests\Models;
+
+use Modules\Admin\Models\Address;
+use phpOMS\Stdlib\Base\AddressType;
+
+/**
+ * @testdox Modules\Admin\tests\Models\AddressTest: Address model
+ *
+ * @internal
+ */
+class AddressTest extends \PHPUnit\Framework\TestCase
+{
+    protected Address $address;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function setUp() : void
+    {
+        $this->address = new Address();
+    }
+
+    /**
+     * @covers Modules\Admin\Models\Address
+     * @group module
+     */
+    public function testDefault() : void
+    {
+        $expected = [
+            'postal'  => '',
+            'city'    => '',
+            'country' => 'US',
+            'address' => '',
+            'state'   => '',
+            'geo'     => [
+                'lat'  => 0,
+                'long' => 0,
+            ],
+            'name'  => '',
+            'addition'  => '',
+        ];
+
+        self::assertEquals('', $this->address->name);
+        self::assertEquals('', $this->address->addition);
+        self::assertEquals($expected, $this->address->toArray());
+        self::assertEquals($expected, $this->address->jsonSerialize());
+    }
+
+    public function testToArray() : void
+    {
+        $expected = [
+            'postal'  => '0123456789',
+            'city'    => 'city',
+            'country' => 'Country',
+            'address' => 'Some address here',
+            'state'   => 'This is a state 123',
+            'geo'     => [
+                'lat'  => 12.1,
+                'long' => 11.2,
+            ],
+            'name'  => 'name',
+            'addition'  => 'addition',
+        ];
+
+        $this->address->name = 'name';
+        $this->address->addition = 'addition';
+        $this->address->postal = '0123456789';
+        $this->address->setType(AddressType::BUSINESS);
+        $this->address->city    = 'city';
+        $this->address->address = 'Some address here';
+        $this->address->state   = 'This is a state 123';
+        $this->address->setCountry('Country');
+        $this->address->setGeo(['lat' => 12.1, 'long' => 11.2,]);
+
+        self::assertEquals($expected, $this->address->toArray());
+    }
+
+    public function testJsonSerialize() : void
+    {
+        $expected = [
+            'postal'  => '0123456789',
+            'city'    => 'city',
+            'country' => 'Country',
+            'address' => 'Some address here',
+            'state'   => 'This is a state 123',
+            'geo'     => [
+                'lat'  => 12.1,
+                'long' => 11.2,
+            ],
+            'name'  => 'name',
+            'addition'  => 'addition',
+        ];
+
+        $this->address->name = 'name';
+        $this->address->addition = 'addition';
+        $this->address->postal = '0123456789';
+        $this->address->setType(AddressType::BUSINESS);
+        $this->address->city    = 'city';
+        $this->address->address = 'Some address here';
+        $this->address->state   = 'This is a state 123';
+        $this->address->setCountry('Country');
+        $this->address->setGeo(['lat' => 12.1, 'long' => 11.2,]);
+
+        self::assertEquals($expected, $this->address->jsonSerialize());
+        self::assertEquals(\json_encode($this->address->jsonSerialize()), $this->address->serialize());
+    }
+
+    public function testUnserialize() : void
+    {
+        $expected = [
+            'postal'  => '0123456789',
+            'city'    => 'city',
+            'country' => 'Country',
+            'address' => 'Some address here',
+            'state'   => 'This is a state 123',
+            'geo'     => [
+                'lat'  => 12.1,
+                'long' => 11.2,
+            ],
+            'name'  => 'name',
+            'addition'  => 'addition',
+        ];
+
+        $this->address->unserialize(\json_encode($expected));
+        self::assertEquals(\json_encode($expected), $this->address->serialize());
+    }
+}
diff --git a/tests/Models/AppMapperTest.php b/tests/Models/AppMapperTest.php
new file mode 100644
index 0000000..2c053b3
--- /dev/null
+++ b/tests/Models/AppMapperTest.php
@@ -0,0 +1,51 @@
+<?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\Admin\tests\Models;
+
+use Modules\Admin\Models\App;
+use Modules\Admin\Models\AppMapper;
+use phpOMS\Application\ApplicationStatus;
+use phpOMS\Utils\TestUtils;
+
+/**
+ * @testdox Modules\Admin\tests\Models\AppMapperTest: App database mapper
+ *
+ * @internal
+ */
+class AppMapperTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @testdox The model can be created and read from the database
+     * @covers Modules\Admin\Models\AppMapper
+     * @group module
+     */
+    public function testCR() : void
+    {
+        $app = new App();
+
+        $app->name = 'TestAppName';
+        $app->theme = 'Default';
+        $app->status = ApplicationStatus::NORMAL;
+
+        $id = AppMapper::create($app);
+        self::assertGreaterThan(0, $app->getId());
+        self::assertEquals($id, $app->getId());
+
+        $appR = AppMapper::get($app->getId());
+        self::assertEquals($app->name, $appR->name);
+        self::assertEquals($app->theme, $appR->theme);
+        self::assertEquals($app->status, $appR->status);
+    }
+}
diff --git a/tests/Models/AppTest.php b/tests/Models/AppTest.php
new file mode 100644
index 0000000..43eca0a
--- /dev/null
+++ b/tests/Models/AppTest.php
@@ -0,0 +1,36 @@
+<?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\Admin\tests\Models;
+
+use Modules\Admin\Models\App;
+
+/**
+ * @testdox Modules\Admin\tests\Models\AppTest: App model
+ *
+ * @internal
+ */
+class AppTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @testdox The account has the expected default values after initialization
+     * @covers Modules\Admin\Models\App
+     * @group module
+     */
+    public function testDefault() : void
+    {
+        $account = new App();
+        self::assertEquals(0, $account->getId());
+    }
+}
diff --git a/tests/Models/GroupMapperTest.php b/tests/Models/GroupMapperTest.php
index 895d0f9..b6b6e60 100755
--- a/tests/Models/GroupMapperTest.php
+++ b/tests/Models/GroupMapperTest.php
@@ -50,4 +50,14 @@ class GroupMapperTest extends \PHPUnit\Framework\TestCase
 
         self::assertTrue(false);
     }
+
+    /**
+     * @covers Modules\Admin\Models\GroupMapper
+     * @group module
+     */
+    public function testCountMembers() : void
+    {
+        self::assertEquals([3 => 1], GroupMapper::countMembers());
+        self::assertEquals([], GroupMapper::countMembers(1));
+    }
 }
diff --git a/tests/Models/GroupTest.php b/tests/Models/GroupTest.php
index 372a82b..dbf363e 100755
--- a/tests/Models/GroupTest.php
+++ b/tests/Models/GroupTest.php
@@ -24,6 +24,16 @@ use Modules\Admin\Models\NullAccount;
  */
 class GroupTest extends \PHPUnit\Framework\TestCase
 {
+    protected Group $group;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function setUp() : void
+    {
+        $this->group = new Group();
+    }
+
     /**
      * @testdox The group has the expected default values after initialization
      * @covers Modules\Admin\Models\Group
@@ -31,11 +41,10 @@ class GroupTest extends \PHPUnit\Framework\TestCase
      */
     public function testDefault() : void
     {
-        $group = new Group();
-        self::assertEquals((new \DateTime('now'))->format('Y-m-d'), $group->createdAt->format('Y-m-d'));
-        self::assertEquals(0, $group->createdBy->getId());
-        self::assertEquals('', $group->descriptionRaw);
-        self::assertEquals([], $group->getAccounts());
+        self::assertEquals((new \DateTime('now'))->format('Y-m-d'), $this->group->createdAt->format('Y-m-d'));
+        self::assertEquals(0, $this->group->createdBy->getId());
+        self::assertEquals('', $this->group->descriptionRaw);
+        self::assertEquals([], $this->group->getAccounts());
     }
 
     /**
@@ -45,10 +54,8 @@ class GroupTest extends \PHPUnit\Framework\TestCase
      */
     public function testDescriptionInputOutput() : void
     {
-        $group = new Group();
-
-        $group->descriptionRaw = 'Some test';
-        self::assertEquals('Some test', $group->descriptionRaw);
+        $this->group->descriptionRaw = 'Some test';
+        self::assertEquals('Some test', $this->group->descriptionRaw);
     }
 
     /**
@@ -58,9 +65,7 @@ class GroupTest extends \PHPUnit\Framework\TestCase
      */
     public function testCreatorInputOutput() : void
     {
-        $group = new Group();
-
-        $group->createdBy = new NullAccount(3);
-        self::assertEquals(3, $group->createdBy->getId());
+        $this->group->createdBy = new NullAccount(3);
+        self::assertEquals(3, $this->group->createdBy->getId());
     }
 }
diff --git a/tests/Models/NullAccount.php b/tests/Models/NullAccount.php
new file mode 100644
index 0000000..7ec1f2a
--- /dev/null
+++ b/tests/Models/NullAccount.php
@@ -0,0 +1,42 @@
+<?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\Admin\tests\Models;
+
+use Modules\Admin\Models\NullAccount;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\Admin\Models\NullAccount
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\Admin\Models\Account', new NullAccount());
+    }
+
+    /**
+     * @covers Modules\Admin\Models\NullAccount
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullAccount(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullAccountPermission.php b/tests/Models/NullAccountPermission.php
new file mode 100644
index 0000000..0f4353c
--- /dev/null
+++ b/tests/Models/NullAccountPermission.php
@@ -0,0 +1,42 @@
+<?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\Admin\tests\Models;
+
+use Modules\Admin\Models\NullAccountPermission;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\Admin\Models\NullAccountPermission
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\Admin\Models\AccountPermission', new NullAccountPermission());
+    }
+
+    /**
+     * @covers Modules\Admin\Models\NullAccountPermission
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullAccountPermission(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullAddress.php b/tests/Models/NullAddress.php
new file mode 100644
index 0000000..0aceaa7
--- /dev/null
+++ b/tests/Models/NullAddress.php
@@ -0,0 +1,42 @@
+<?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\Admin\tests\Models;
+
+use Modules\Admin\Models\NullAddress;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\Admin\Models\NullAddress
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\Admin\Models\Address', new NullAddress());
+    }
+
+    /**
+     * @covers Modules\Admin\Models\NullAddress
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullAddress(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullGroup.php b/tests/Models/NullGroup.php
new file mode 100644
index 0000000..751a845
--- /dev/null
+++ b/tests/Models/NullGroup.php
@@ -0,0 +1,42 @@
+<?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\Admin\tests\Models;
+
+use Modules\Admin\Models\NullGroup;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\Admin\Models\NullGroup
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\Admin\Models\Group', new NullGroup());
+    }
+
+    /**
+     * @covers Modules\Admin\Models\NullGroup
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullGroup(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullGroupPermission.php b/tests/Models/NullGroupPermission.php
new file mode 100644
index 0000000..55b7480
--- /dev/null
+++ b/tests/Models/NullGroupPermission.php
@@ -0,0 +1,42 @@
+<?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\Admin\tests\Models;
+
+use Modules\Admin\Models\NullGroupPermission;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\Admin\Models\NullGroupPermission
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\Admin\Models\GroupPermission', new NullGroupPermission());
+    }
+
+    /**
+     * @covers Modules\Admin\Models\NullGroupPermission
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullGroupPermission(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullModule.php b/tests/Models/NullModule.php
new file mode 100644
index 0000000..f94c5c7
--- /dev/null
+++ b/tests/Models/NullModule.php
@@ -0,0 +1,42 @@
+<?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\Admin\tests\Models;
+
+use Modules\Admin\Models\NullModule;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\Admin\Models\NullModule
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\Admin\Models\Module', new NullModule());
+    }
+
+    /**
+     * @covers Modules\Admin\Models\NullModule
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullModule(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullModuleTest.php b/tests/Models/NullModuleTest.php
new file mode 100644
index 0000000..db9725a
--- /dev/null
+++ b/tests/Models/NullModuleTest.php
@@ -0,0 +1,42 @@
+<?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\Admin\tests\Models;
+
+use Modules\Admin\Models\NullModule;
+
+/**
+ * @internal
+ */
+final class NullModuleTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\Admin\Models\NullModule
+     * @group module
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\Admin\Models\Module', new NullModule());
+    }
+
+    /**
+     * @covers Modules\Admin\Models\NullModule
+     * @group module
+     */
+    public function testId() : void
+    {
+        $null = new NullModule('Test');
+        self::assertEquals('Test', $null->getId());
+    }
+}