Fixed PHPunit tests

src/Serializer/StructuralElementNormalizer.php

@@ -23,6 +23,7 @@ declare(strict_types=1);
 namespace App\Serializer;
 
 use App\Entity\Base\AbstractStructuralDBElement;
+use App\Serializer\APIPlatform\SkippableItemNormalizer;
 use Symfony\Component\DependencyInjection\Attribute\Autowire;
 use Symfony\Component\Serializer\Normalizer\NormalizerAwareInterface;
 use Symfony\Component\Serializer\Normalizer\NormalizerAwareTrait;
@@ -36,6 +37,8 @@ class StructuralElementNormalizer implements NormalizerInterface, NormalizerAwar
 {
     use NormalizerAwareTrait;
 
+    public const ALREADY_CALLED = 'STRUCTURAL_ELEMENT_NORMALIZER_ALREADY_CALLED';
+
     public function supportsNormalization($data, ?string $format = null, array $context = []): bool
     {
         //Only normalize if we are doing a file export operation
@@ -43,15 +46,25 @@ class StructuralElementNormalizer implements NormalizerInterface, NormalizerAwar
             return false;
         }
 
+        if (isset($context[self::ALREADY_CALLED]) && in_array($data, $context[self::ALREADY_CALLED], true)) {
+            //If we already handled this object, skip it
+            return false;
+        }
+
         return $data instanceof AbstractStructuralDBElement;
     }
 
-    public function normalize($object, ?string $format = null, array $context = []): \ArrayObject|bool|float|int|string
+    public function normalize($object, ?string $format = null, array $context = []): \ArrayObject|bool|float|int|string|array
     {
         if (!$object instanceof AbstractStructuralDBElement) {
             throw new \InvalidArgumentException('This normalizer only supports AbstractStructural objects!');
         }
 
+        //Avoid infinite recursion by checking if we already handled this object
+        $context[self::ALREADY_CALLED] = $context[self::ALREADY_CALLED] ?? [];
+        $context[SkippableItemNormalizer::DISABLE_ITEM_NORMALIZER] = true;
+        $context[self::ALREADY_CALLED][] = $object;
+
         $data = $this->normalizer->normalize($object, $format, $context);
 
         //If the data is not an array, we can't do anything with it
@@ -75,7 +88,8 @@ class StructuralElementNormalizer implements NormalizerInterface, NormalizerAwar
     public function getSupportedTypes(?string $format): array
     {
         return [
-            AbstractStructuralDBElement::class => true,
+            //We cannot cache the result, as it depends on the context
+            AbstractStructuralDBElement::class => false,
         ];
     }
 }