Create non-regression test

Author: vincentchalamon

features/swagger/docs.feature

@@ -110,3 +110,4 @@ Feature: Documentation support
     And the response should be in JSON
     And the header "Content-Type" should be equal to "application/json; charset=utf-8"
     And the JSON node "basePath" should be equal to "/"
+    And the JSON node "foo" should be equal to "bar"

tests/Fixtures/TestBundle/Serializer/Normalizer/OverrideDocumentationNormalizer.php

@@ -0,0 +1,42 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\Core\Tests\Fixtures\TestBundle\Serializer\Normalizer;
+
+use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
+
+/**
+ * @author Vincent Chalamon <[email protected]>
+ */
+final class OverrideDocumentationNormalizer implements NormalizerInterface
+{
+    private $documentationNormalizer;
+
+    public function __construct(NormalizerInterface $documentationNormalizer)
+    {
+        $this->documentationNormalizer = $documentationNormalizer;
+    }
+
+    public function normalize($object, $format = null, array $context = [])
+    {
+        $data = $this->documentationNormalizer->normalize($object, $format, $context);
+        $data['foo'] = 'bar';
+
+        return $data;
+    }
+
+    public function supportsNormalization($data, $format = null)
+    {
+        return $this->documentationNormalizer->supportsNormalization($data, $format);
+    }
+}

tests/Fixtures/app/config/config_common.yml

@@ -197,3 +197,9 @@ services:
 
     mercure.hub.default.publisher:
         class: ApiPlatform\Core\Tests\Fixtures\DummyMercurePublisher
+
+    app.serializer.normalizer.override_documentation:
+        class: ApiPlatform\Core\Tests\Fixtures\TestBundle\Serializer\Normalizer\OverrideDocumentationNormalizer
+        decorates: api_platform.swagger.normalizer.documentation
+        public: false
+        arguments: ['@app.serializer.normalizer.override_documentation.inner']