diff --git a/tests/Models/NullCategory.php b/tests/Models/NullCategory.php
new file mode 100644
index 0000000..80da3df
--- /dev/null
+++ b/tests/Models/NullCategory.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\RiskManagement\tests\Models;
+
+use Modules\RiskManagement\Models\NullCategory;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\RiskManagement\Models\NullCategory
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\RiskManagement\Models\Category', new NullCategory());
+    }
+
+    /**
+     * @covers Modules\RiskManagement\Models\NullCategory
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullCategory(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullCause.php b/tests/Models/NullCause.php
new file mode 100644
index 0000000..bf7d12f
--- /dev/null
+++ b/tests/Models/NullCause.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\RiskManagement\tests\Models;
+
+use Modules\RiskManagement\Models\NullCause;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\RiskManagement\Models\NullCause
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\RiskManagement\Models\Cause', new NullCause());
+    }
+
+    /**
+     * @covers Modules\RiskManagement\Models\NullCause
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullCause(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullDepartment.php b/tests/Models/NullDepartment.php
new file mode 100644
index 0000000..0e43198
--- /dev/null
+++ b/tests/Models/NullDepartment.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\RiskManagement\tests\Models;
+
+use Modules\RiskManagement\Models\NullDepartment;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\RiskManagement\Models\NullDepartment
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\RiskManagement\Models\Department', new NullDepartment());
+    }
+
+    /**
+     * @covers Modules\RiskManagement\Models\NullDepartment
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullDepartment(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullProcess.php b/tests/Models/NullProcess.php
new file mode 100644
index 0000000..4993ef8
--- /dev/null
+++ b/tests/Models/NullProcess.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\RiskManagement\tests\Models;
+
+use Modules\RiskManagement\Models\NullProcess;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\RiskManagement\Models\NullProcess
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\RiskManagement\Models\Process', new NullProcess());
+    }
+
+    /**
+     * @covers Modules\RiskManagement\Models\NullProcess
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullProcess(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullProject.php b/tests/Models/NullProject.php
new file mode 100644
index 0000000..2261300
--- /dev/null
+++ b/tests/Models/NullProject.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\RiskManagement\tests\Models;
+
+use Modules\RiskManagement\Models\NullProject;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\RiskManagement\Models\NullProject
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\RiskManagement\Models\Project', new NullProject());
+    }
+
+    /**
+     * @covers Modules\RiskManagement\Models\NullProject
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullProject(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullRisk.php b/tests/Models/NullRisk.php
new file mode 100644
index 0000000..9693cca
--- /dev/null
+++ b/tests/Models/NullRisk.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\RiskManagement\tests\Models;
+
+use Modules\RiskManagement\Models\NullRisk;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\RiskManagement\Models\NullRisk
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\RiskManagement\Models\Risk', new NullRisk());
+    }
+
+    /**
+     * @covers Modules\RiskManagement\Models\NullRisk
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullRisk(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullRiskObject.php b/tests/Models/NullRiskObject.php
new file mode 100644
index 0000000..735a6f3
--- /dev/null
+++ b/tests/Models/NullRiskObject.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\RiskManagement\tests\Models;
+
+use Modules\RiskManagement\Models\NullRiskObject;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\RiskManagement\Models\NullRiskObject
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\RiskManagement\Models\RiskObject', new NullRiskObject());
+    }
+
+    /**
+     * @covers Modules\RiskManagement\Models\NullRiskObject
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullRiskObject(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullSolution.php b/tests/Models/NullSolution.php
new file mode 100644
index 0000000..2bc3f9b
--- /dev/null
+++ b/tests/Models/NullSolution.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\RiskManagement\tests\Models;
+
+use Modules\RiskManagement\Models\NullSolution;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\RiskManagement\Models\NullSolution
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\RiskManagement\Models\Solution', new NullSolution());
+    }
+
+    /**
+     * @covers Modules\RiskManagement\Models\NullSolution
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullSolution(2);
+        self::assertEquals(2, $null->getId());
+    }
+}