diff --git a/tests/Models/NullSupplier.php b/tests/Models/NullSupplier.php
new file mode 100644
index 0000000..a2270d4
--- /dev/null
+++ b/tests/Models/NullSupplier.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\SupplierManagement\tests\Models;
+
+use Modules\SupplierManagement\Models\NullSupplier;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplier
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\SupplierManagement\Models\Supplier', new NullSupplier());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplier
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullSupplier(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullSupplierAttribute.php b/tests/Models/NullSupplierAttribute.php
new file mode 100644
index 0000000..f3219f7
--- /dev/null
+++ b/tests/Models/NullSupplierAttribute.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\SupplierManagement\tests\Models;
+
+use Modules\SupplierManagement\Models\NullSupplierAttribute;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplierAttribute
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\SupplierManagement\Models\SupplierAttribute', new NullSupplierAttribute());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplierAttribute
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullSupplierAttribute(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullSupplierAttributeType.php b/tests/Models/NullSupplierAttributeType.php
new file mode 100644
index 0000000..441cccd
--- /dev/null
+++ b/tests/Models/NullSupplierAttributeType.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\SupplierManagement\tests\Models;
+
+use Modules\SupplierManagement\Models\NullSupplierAttributeType;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeType
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\SupplierManagement\Models\SupplierAttributeType', new NullSupplierAttributeType());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeType
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullSupplierAttributeType(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullSupplierAttributeTypeL11n.php b/tests/Models/NullSupplierAttributeTypeL11n.php
new file mode 100644
index 0000000..c94ce63
--- /dev/null
+++ b/tests/Models/NullSupplierAttributeTypeL11n.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\SupplierManagement\tests\Models;
+
+use Modules\SupplierManagement\Models\NullSupplierAttributeTypeL11n;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeTypeL11n
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\SupplierManagement\Models\SupplierAttributeTypeL11n', new NullSupplierAttributeTypeL11n());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeTypeL11n
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullSupplierAttributeTypeL11n(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullSupplierAttributeValue.php b/tests/Models/NullSupplierAttributeValue.php
new file mode 100644
index 0000000..56ab204
--- /dev/null
+++ b/tests/Models/NullSupplierAttributeValue.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\SupplierManagement\tests\Models;
+
+use Modules\SupplierManagement\Models\NullSupplierAttributeValue;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeValue
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\SupplierManagement\Models\SupplierAttributeValue', new NullSupplierAttributeValue());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeValue
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullSupplierAttributeValue(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullSupplierTest.php b/tests/Models/NullSupplierTest.php
new file mode 100644
index 0000000..3692319
--- /dev/null
+++ b/tests/Models/NullSupplierTest.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\SupplierManagement\tests\Models;
+
+use Modules\SupplierManagement\Models\NullSupplier;
+
+/**
+ * @internal
+ */
+final class NullSupplierTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplier
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\SupplierManagement\Models\Supplier', new NullSupplier());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplier
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullSupplier(2);
+        self::assertEquals(2, $null->getId());
+    }
+}