diff --git a/tests/Admin/AdminTest.php b/tests/Admin/AdminTest.php
new file mode 100644
index 0000000..25c04be
--- /dev/null
+++ b/tests/Admin/AdminTest.php
@@ -0,0 +1,27 @@
+<?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\ContractManagement\tests\Admin;
+
+/**
+ * @internal
+ */
+class AdminTest extends \PHPUnit\Framework\TestCase
+{
+    protected const NAME = 'ContractManagement';
+
+    protected const URI_LOAD = '';
+
+    use \Modules\tests\ModuleTestTrait;
+}
diff --git a/tests/Models/NullContract.php b/tests/Models/NullContract.php
new file mode 100644
index 0000000..8ec6095
--- /dev/null
+++ b/tests/Models/NullContract.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\ContractManagement\tests\Models;
+
+use Modules\ContractManagement\Models\NullContract;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\ContractManagement\Models\NullContract
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\ContractManagement\Models\Contract', new NullContract());
+    }
+
+    /**
+     * @covers Modules\ContractManagement\Models\NullContract
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullContract(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullContractTest.php b/tests/Models/NullContractTest.php
new file mode 100644
index 0000000..be77912
--- /dev/null
+++ b/tests/Models/NullContractTest.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\ContractManagement\tests\Models;
+
+use Modules\ContractManagement\Models\NullContract;
+
+/**
+ * @internal
+ */
+final class NullContractTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\ContractManagement\Models\NullContract
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\ContractManagement\Models\Contract', new NullContract());
+    }
+
+    /**
+     * @covers Modules\ContractManagement\Models\NullContract
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullContract(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullContractType.php b/tests/Models/NullContractType.php
new file mode 100644
index 0000000..1dee31e
--- /dev/null
+++ b/tests/Models/NullContractType.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\ContractManagement\tests\Models;
+
+use Modules\ContractManagement\Models\NullContractType;
+
+/**
+ * @internal
+ */
+final class Null extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\ContractManagement\Models\NullContractType
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\ContractManagement\Models\ContractType', new NullContractType());
+    }
+
+    /**
+     * @covers Modules\ContractManagement\Models\NullContractType
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullContractType(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullContractTypeL11n.php b/tests/Models/NullContractTypeL11n.php
new file mode 100644
index 0000000..20a95ba
--- /dev/null
+++ b/tests/Models/NullContractTypeL11n.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\ContractManagement\tests\Models;
+
+use Modules\ContractManagement\Models\NullContractTypeL11n;
+
+/**
+ * @internal
+ */
+final class NullContractTypeL11nTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\ContractManagement\Models\NullContractTypeL11n
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\ContractManagement\Models\ContractTypeL11n', new NullContractTypeL11n());
+    }
+
+    /**
+     * @covers Modules\ContractManagement\Models\NullContractTypeL11n
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullContractTypeL11n(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullContractTypeTest.php b/tests/Models/NullContractTypeTest.php
new file mode 100644
index 0000000..3fed45f
--- /dev/null
+++ b/tests/Models/NullContractTypeTest.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\ContractManagement\tests\Models;
+
+use Modules\ContractManagement\Models\NullContractType;
+
+/**
+ * @internal
+ */
+final class NullContractTypeTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\ContractManagement\Models\NullContractType
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\ContractManagement\Models\ContractType', new NullContractType());
+    }
+
+    /**
+     * @covers Modules\ContractManagement\Models\NullContractType
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullContractType(2);
+        self::assertEquals(2, $null->getId());
+    }
+}