diff --git a/tests/API/Endpoints/PartCustomStateEndpointTest.php b/tests/API/Endpoints/PartCustomStateEndpointTest.php
new file mode 100644
index 00000000..ac353d9c
--- /dev/null
+++ b/tests/API/Endpoints/PartCustomStateEndpointTest.php
@@ -0,0 +1,69 @@
+<?php
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2024 Jan Böhmer (https://github.com/jbtronics)
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published
+ *  by the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+
+namespace App\Tests\API\Endpoints;
+
+class PartCustomStateEndpointTest extends CrudEndpointTestCase
+{
+
+    protected function getBasePath(): string
+    {
+        return '/api/part_custom_states';
+    }
+
+    public function testGetCollection(): void
+    {
+        $this->_testGetCollection();
+        self::assertJsonContains([
+            'hydra:totalItems' => 7,
+        ]);
+    }
+
+    public function testGetItem(): void
+    {
+        $this->_testGetItem(1);
+        $this->_testGetItem(2);
+        $this->_testGetItem(3);
+    }
+
+    public function testCreateItem(): void
+    {
+        $this->_testPostItem([
+            'name' => 'Test API',
+            'parent' => '/api/part_custom_states/1',
+        ]);
+    }
+
+    public function testUpdateItem(): void
+    {
+        $this->_testPatchItem(5, [
+            'name' => 'Updated',
+            'parent' => '/api/part_custom_states/2',
+        ]);
+    }
+
+    public function testDeleteItem(): void
+    {
+        $this->_testDeleteItem(4);
+    }
+}