diff --git a/tests/Models/NullQAAnswer.php b/tests/Models/NullQAAnswer.php
new file mode 100644
index 0000000..9a42a09
--- /dev/null
+++ b/tests/Models/NullQAAnswer.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\QA\tests\Models;
+
+use Modules\QA\Models\NullQAAnswer;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\QA\Models\NullQAAnswer
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\QA\Models\QAAnswer', new NullQAAnswer());
+    }
+
+    /**
+     * @covers Modules\QA\Models\NullQAAnswer
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullQAAnswer(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullQAAnswerVote.php b/tests/Models/NullQAAnswerVote.php
new file mode 100644
index 0000000..c6880ca
--- /dev/null
+++ b/tests/Models/NullQAAnswerVote.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\QA\tests\Models;
+
+use Modules\QA\Models\NullQAAnswerVote;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\QA\Models\NullQAAnswerVote
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\QA\Models\QAAnswerVote', new NullQAAnswerVote());
+    }
+
+    /**
+     * @covers Modules\QA\Models\NullQAAnswerVote
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullQAAnswerVote(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullQAApp.php b/tests/Models/NullQAApp.php
new file mode 100644
index 0000000..a98aff5
--- /dev/null
+++ b/tests/Models/NullQAApp.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\QA\tests\Models;
+
+use Modules\QA\Models\NullQAApp;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\QA\Models\NullQAApp
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\QA\Models\QAApp', new NullQAApp());
+    }
+
+    /**
+     * @covers Modules\QA\Models\NullQAApp
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullQAApp(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullQAQuestion.php b/tests/Models/NullQAQuestion.php
new file mode 100644
index 0000000..44cffdf
--- /dev/null
+++ b/tests/Models/NullQAQuestion.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\QA\tests\Models;
+
+use Modules\QA\Models\NullQAQuestion;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\QA\Models\NullQAQuestion
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\QA\Models\QAQuestion', new NullQAQuestion());
+    }
+
+    /**
+     * @covers Modules\QA\Models\NullQAQuestion
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullQAQuestion(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullQAQuestionVote.php b/tests/Models/NullQAQuestionVote.php
new file mode 100644
index 0000000..492e307
--- /dev/null
+++ b/tests/Models/NullQAQuestionVote.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\QA\tests\Models;
+
+use Modules\QA\Models\NullQAQuestionVote;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\QA\Models\NullQAQuestionVote
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\QA\Models\QAQuestionVote', new NullQAQuestionVote());
+    }
+
+    /**
+     * @covers Modules\QA\Models\NullQAQuestionVote
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullQAQuestionVote(2);
+        self::assertEquals(2, $null->getId());
+    }
+}