diff --git a/tests/Models/NullClient.php b/tests/Models/NullClient.php
new file mode 100644
index 0000000..b2471d6
--- /dev/null
+++ b/tests/Models/NullClient.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\ClientManagement\tests\Models;
+
+use Modules\ClientManagement\Models\NullClient;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\ClientManagement\Models\NullClient
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\ClientManagement\Models\Client', new NullClient());
+    }
+
+    /**
+     * @covers Modules\ClientManagement\Models\NullClient
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullClient(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullClientAttribute.php b/tests/Models/NullClientAttribute.php
new file mode 100644
index 0000000..c9b3f88
--- /dev/null
+++ b/tests/Models/NullClientAttribute.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\ClientManagement\tests\Models;
+
+use Modules\ClientManagement\Models\NullClientAttribute;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\ClientManagement\Models\NullClientAttribute
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\ClientManagement\Models\ClientAttribute', new NullClientAttribute());
+    }
+
+    /**
+     * @covers Modules\ClientManagement\Models\NullClientAttribute
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullClientAttribute(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullClientAttributeTest.php b/tests/Models/NullClientAttributeTest.php
new file mode 100644
index 0000000..0683886
--- /dev/null
+++ b/tests/Models/NullClientAttributeTest.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\ClientManagement\tests\Models;
+
+use Modules\ClientManagement\Models\NullClientAttribute;
+
+/**
+ * @internal
+ */
+final class NullClientAttributeTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\ClientManagement\Models\NullClientAttribute
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\ClientManagement\Models\ClientAttribute', new NullClientAttribute());
+    }
+
+    /**
+     * @covers Modules\ClientManagement\Models\NullClientAttribute
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullClientAttribute(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullClientAttributeType.php b/tests/Models/NullClientAttributeType.php
new file mode 100644
index 0000000..b08973f
--- /dev/null
+++ b/tests/Models/NullClientAttributeType.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\ClientManagement\tests\Models;
+
+use Modules\ClientManagement\Models\NullClientAttributeType;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\ClientManagement\Models\NullClientAttributeType
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\ClientManagement\Models\ClientAttributeType', new NullClientAttributeType());
+    }
+
+    /**
+     * @covers Modules\ClientManagement\Models\NullClientAttributeType
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullClientAttributeType(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullClientAttributeTypeL11n.php b/tests/Models/NullClientAttributeTypeL11n.php
new file mode 100644
index 0000000..403cacc
--- /dev/null
+++ b/tests/Models/NullClientAttributeTypeL11n.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\ClientManagement\tests\Models;
+
+use Modules\ClientManagement\Models\NullClientAttributeTypeL11n;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\ClientManagement\Models\NullClientAttributeTypeL11n
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\ClientManagement\Models\ClientAttributeTypeL11n', new NullClientAttributeTypeL11n());
+    }
+
+    /**
+     * @covers Modules\ClientManagement\Models\NullClientAttributeTypeL11n
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullClientAttributeTypeL11n(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullClientAttributeTypeL11nTest.php b/tests/Models/NullClientAttributeTypeL11nTest.php
new file mode 100644
index 0000000..eb67e67
--- /dev/null
+++ b/tests/Models/NullClientAttributeTypeL11nTest.php
@@ -0,0 +1,43 @@
+<?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\ClientManagement\tests\Models;
+
+use Modules\ClientManagement\Models\NullClientAttributeTypeL11n;
+
+/**
+ * @internal
+ */
+final class NullClientAttributeTypeL11nTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\ClientManagement\Models\NullClientAttributeTypeL11n
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\ClientManagement\Models\ClientAttributeTypeL11n', new NullClientAttributeTypeL11n());
+    }
+
+
+    /**
+     * @covers Modules\ClientManagement\Models\NullClientAttributeTypeL11n
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullClientAttributeTypeL11n(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullClientAttributeTypeTest.php b/tests/Models/NullClientAttributeTypeTest.php
new file mode 100644
index 0000000..d015f5f
--- /dev/null
+++ b/tests/Models/NullClientAttributeTypeTest.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\ClientManagement\tests\Models;
+
+use Modules\ClientManagement\Models\NullClientAttributeType;
+
+/**
+ * @internal
+ */
+final class NullClientAttributeTypeTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\ClientManagement\Models\NullClientAttributeType
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\ClientManagement\Models\ClientAttributeType', new NullClientAttributeType());
+    }
+
+    /**
+     * @covers Modules\ClientManagement\Models\NullClientAttributeType
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullClientAttributeType(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullClientAttributeValue.php b/tests/Models/NullClientAttributeValue.php
new file mode 100644
index 0000000..8bcc13d
--- /dev/null
+++ b/tests/Models/NullClientAttributeValue.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\ClientManagement\tests\Models;
+
+use Modules\ClientManagement\Models\NullClientAttributeValue;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\ClientManagement\Models\NullClientAttributeValue
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\ClientManagement\Models\ClientAttributeValue', new NullClientAttributeValue());
+    }
+
+    /**
+     * @covers Modules\ClientManagement\Models\NullClientAttributeValue
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullClientAttributeValue(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullClientAttributeValueTest.php b/tests/Models/NullClientAttributeValueTest.php
new file mode 100644
index 0000000..f6d168e
--- /dev/null
+++ b/tests/Models/NullClientAttributeValueTest.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\ClientManagement\tests\Models;
+
+use Modules\ClientManagement\Models\NullClientAttributeValue;
+
+/**
+ * @internal
+ */
+final class NullClientAttributeValueTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\ClientManagement\Models\NullClientAttributeValue
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\ClientManagement\Models\ClientAttributeValue', new NullClientAttributeValue());
+    }
+
+    /**
+     * @covers Modules\ClientManagement\Models\NullClientAttributeValue
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullClientAttributeValue(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullClientTest.php b/tests/Models/NullClientTest.php
new file mode 100644
index 0000000..6c7dcf3
--- /dev/null
+++ b/tests/Models/NullClientTest.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\ClientManagement\tests\Models;
+
+use Modules\ClientManagement\Models\NullClient;
+
+/**
+ * @internal
+ */
+final class NullClientTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\ClientManagement\Models\NullClient
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\ClientManagement\Models\Client', new NullClient());
+    }
+
+    /**
+     * @covers Modules\ClientManagement\Models\NullClient
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullClient(2);
+        self::assertEquals(2, $null->getId());
+    }
+}