diff --git a/tests/Fixtures/Scratch/CustomAttributes.php b/tests/Fixtures/Scratch/CustomAttributes.php
new file mode 100644
index 00000000..c913c65f
--- /dev/null
+++ b/tests/Fixtures/Scratch/CustomAttributes.php
@@ -0,0 +1,94 @@
+<?php declare(strict_types=1);
+
+/**
+ * @license Apache 2.0
+ */
+
+namespace OpenApi\Tests\Fixtures\Scratch;
+
+use OpenApi\Attributes as OAT;
+
+// ======== custom attributes =======================
+
+#[\Attribute(\Attribute::TARGET_CLASS)]
+class CustomInfo extends OAT\Info
+{
+}
+
+#[\Attribute(\Attribute::TARGET_CLASS | \Attribute::TARGET_METHOD | \Attribute::TARGET_PROPERTY)]
+class CustomSchema extends OAT\Schema
+{
+}
+
+#[\Attribute(\Attribute::TARGET_PROPERTY | \Attribute::TARGET_PARAMETER)]
+class CustomProperty extends OAT\Property
+{
+}
+
+#[\Attribute(\Attribute::TARGET_METHOD | \Attribute::TARGET_PROPERTY | \Attribute::TARGET_PARAMETER | \Attribute::TARGET_CLASS_CONSTANT | \Attribute::IS_REPEATABLE)]
+class CustomItem extends OAT\Property
+{
+    /** @param class-string $of */
+    public function __construct(
+        string $of,
+        ?string $description = null
+    ) {
+        parent::__construct(
+            ref: $of,
+            title: (new \ReflectionClass($of))->getShortName(),
+            description: $description,
+        );
+    }
+}
+
+#[\Attribute(\Attribute::TARGET_METHOD | \Attribute::TARGET_PROPERTY | \Attribute::TARGET_PARAMETER | \Attribute::TARGET_CLASS_CONSTANT | \Attribute::IS_REPEATABLE)]
+class CustomList extends OAT\Property
+{
+    /** @param class-string $of */
+    public function __construct(string $of, ?string $description = null)
+    {
+        parent::__construct(
+            title: (new \ReflectionClass($of))->getShortName(),
+            description: $description,
+            items: new OAT\Items(ref: $of)
+        );
+    }
+}
+
+#[\Attribute(\Attribute::TARGET_CLASS | \Attribute::TARGET_METHOD)]
+class CustomGet extends OAT\Get
+{
+}
+
+// ======== application code =======================
+
+#[CustomSchema()]
+class CAItemModel
+{
+}
+
+#[CustomSchema()]
+class CAModel
+{
+    #[CustomProperty]
+    public ?string $name;
+
+    #[CustomItem(of: CAItemModel::class)]
+    public readonly CAItemModel $item;
+
+    #[CustomList(of: CAItemModel::class)]
+    public readonly array $items;
+}
+
+#[CustomInfo(
+    title: 'Extended Attributes Scratch',
+    version: '1.0'
+)]
+#[CustomGet(
+    path: '/api/endpoint',
+    description: 'An endpoint',
+    responses: [new OAT\Response(response: 200, description: 'OK')]
+)]
+class CAEndpoint
+{
+}
diff --git a/tests/Fixtures/Scratch/CustomAttributes.yaml b/tests/Fixtures/Scratch/CustomAttributes.yaml
new file mode 100644
index 00000000..4922eb54
--- /dev/null
+++ b/tests/Fixtures/Scratch/CustomAttributes.yaml
@@ -0,0 +1,27 @@
+openapi: 3.0.0
+info:
+  title: 'Extended Attributes Scratch'
+  version: '1.0'
+paths:
+  /api/endpoint:
+    get:
+      description: 'An endpoint'
+      responses:
+        '200':
+          description: OK
+components:
+  schemas:
+    CAItemModel: {  }
+    CAModel:
+      properties:
+        name:
+          type: string
+          nullable: true
+        item:
+          $ref: '#/components/schemas/CAItemModel'
+        items:
+          title: CAItemModel
+          type: array
+          items:
+            $ref: '#/components/schemas/CAItemModel'
+      type: object