diff --git a/tests/Models/NullStockLocationTest.php b/tests/Models/NullStockLocationTest.php
new file mode 100644
index 0000000..1ea4903
--- /dev/null
+++ b/tests/Models/NullStockLocationTest.php
@@ -0,0 +1,52 @@
+<?php
+/**
+ * Jingga
+ *
+ * PHP Version 8.1
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 2.0
+ * @version   1.0.0
+ * @link      https://jingga.app
+ */
+declare(strict_types=1);
+
+namespace Modules\WarehouseManagement\tests\Models;
+
+use Modules\WarehouseManagement\Models\NullStockLocation;
+
+/**
+ * @internal
+ */
+final class NullStockLocationTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\WarehouseManagement\Models\NullStockLocation
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\WarehouseManagement\Models\StockLocation', new NullStockLocation());
+    }
+
+    /**
+     * @covers Modules\WarehouseManagement\Models\NullStockLocation
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullStockLocation(2);
+        self::assertEquals(2, $null->getId());
+    }
+
+    /**
+     * @covers Modules\WarehouseManagement\Models\NullStockLocation
+     * @group framework
+     */
+    public function testJsonSerialize() : void
+    {
+        $null = new NullStockLocation(2);
+        self::assertEquals(['id' => 2], $null);
+    }
+}
diff --git a/tests/Models/NullStockShelfTest.php b/tests/Models/NullStockShelfTest.php
new file mode 100644
index 0000000..ad149d8
--- /dev/null
+++ b/tests/Models/NullStockShelfTest.php
@@ -0,0 +1,52 @@
+<?php
+/**
+ * Jingga
+ *
+ * PHP Version 8.1
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 2.0
+ * @version   1.0.0
+ * @link      https://jingga.app
+ */
+declare(strict_types=1);
+
+namespace Modules\WarehouseManagement\tests\Models;
+
+use Modules\WarehouseManagement\Models\NullStockShelf;
+
+/**
+ * @internal
+ */
+final class NullStockShelfTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\WarehouseManagement\Models\NullStockShelf
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\WarehouseManagement\Models\StockShelf', new NullStockShelf());
+    }
+
+    /**
+     * @covers Modules\WarehouseManagement\Models\NullStockShelf
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullStockShelf(2);
+        self::assertEquals(2, $null->getId());
+    }
+
+    /**
+     * @covers Modules\WarehouseManagement\Models\NullStockShelf
+     * @group framework
+     */
+    public function testJsonSerialize() : void
+    {
+        $null = new NullStockShelf(2);
+        self::assertEquals(['id' => 2], $null);
+    }
+}
diff --git a/tests/Models/NullStockTest.php b/tests/Models/NullStockTest.php
new file mode 100644
index 0000000..5b21c60
--- /dev/null
+++ b/tests/Models/NullStockTest.php
@@ -0,0 +1,52 @@
+<?php
+/**
+ * Jingga
+ *
+ * PHP Version 8.1
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 2.0
+ * @version   1.0.0
+ * @link      https://jingga.app
+ */
+declare(strict_types=1);
+
+namespace Modules\WarehouseManagement\tests\Models;
+
+use Modules\WarehouseManagement\Models\NullStock;
+
+/**
+ * @internal
+ */
+final class NullStockTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\WarehouseManagement\Models\NullStock
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\WarehouseManagement\Models\Stock', new NullStock());
+    }
+
+    /**
+     * @covers Modules\WarehouseManagement\Models\NullStock
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullStock(2);
+        self::assertEquals(2, $null->getId());
+    }
+
+    /**
+     * @covers Modules\WarehouseManagement\Models\NullStock
+     * @group framework
+     */
+    public function testJsonSerialize() : void
+    {
+        $null = new NullStock(2);
+        self::assertEquals(['id' => 2], $null);
+    }
+}