Add integration and unit tests for PersonJsonNormalizer to verify normalization behavior

- Introduce `PersonJsonNormalizerIntegrationTest` to test database-driven normalization scenarios.
- Expand `PersonJsonNormalizerTest` with cases covering minimal group normalization and extended keys.
- Refactor test setup to use mock objects and improve coverage of normalization logic.

src/Bundle/ChillPersonBundle/Tests/Serializer/Normalizer/PersonJsonNormalizerIntegrationTest.php

@@ -0,0 +1,63 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Serializer\Normalizer;
+
+use Chill\PersonBundle\Entity\Person;
+use Chill\PersonBundle\Repository\PersonRepository;
+use PHPUnit\Framework\Assert;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+use Symfony\Component\Serializer\SerializerInterface;
+
+/**
+ * @internal
+ *
+ * @coversNothing
+ */
+final class PersonJsonNormalizerIntegrationTest extends KernelTestCase
+{
+    public function testNormalizeExistingPersonFromDatabase(): void
+    {
+        self::bootKernel();
+        $container = self::getContainer();
+
+        /** @var PersonRepository $repo */
+        $repo = $container->get(PersonRepository::class);
+        $person = $repo->findOneBy([]);
+
+        if (!$person instanceof Person) {
+            self::markTestSkipped('No person found in test database. Load fixtures to enable this test.');
+        }
+
+        /** @var SerializerInterface $serializer */
+        $serializer = $container->get(SerializerInterface::class);
+
+        // Should not throw
+        $data = $serializer->normalize($person, 'json');
+        Assert::assertIsArray($data);
+
+        // Spot check some expected keys exist
+        foreach ([
+            'type', 'id', 'text', 'textAge', 'firstName', 'lastName', 'birthdate', 'age', 'gender', 'civility',
+        ] as $key) {
+            Assert::assertArrayHasKey($key, $data, sprintf('Expected key %s in normalized payload', $key));
+        }
+
+        // Minimal group should also work
+        $minimal = $serializer->normalize($person, 'json', ['groups' => 'minimal']);
+        Assert::assertIsArray($minimal);
+        foreach ([
+            'type', 'id', 'text', 'textAge', 'firstName', 'lastName',
+        ] as $key) {
+            Assert::assertArrayHasKey($key, $minimal, sprintf('Expected key %s in minimal normalized payload', $key));
+        }
+    }
+}