diff --git a/packages/open-api/EventListener/ResponseApiExceptionListener.php b/packages/open-api/EventListener/ResponseApiExceptionListener.php
index 1bb25d56..8e4636b1 100644
--- a/packages/open-api/EventListener/ResponseApiExceptionListener.php
+++ b/packages/open-api/EventListener/ResponseApiExceptionListener.php
@@ -9,26 +9,18 @@
 use Draw\Component\OpenApi\Schema\Response;
 use Draw\Component\OpenApi\Schema\Schema;
 use Symfony\Component\DependencyInjection\Attribute\TaggedIterator;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\EventDispatcher\Attribute\AsEventListener;
 use Symfony\Component\HttpFoundation\JsonResponse;
 use Symfony\Component\HttpKernel\Event\ExceptionEvent;
 use Symfony\Component\Validator\ConstraintViolation;
 use Symfony\Component\Validator\ConstraintViolationInterface;
 use Symfony\Component\Validator\ConstraintViolationList;
 
-final class ResponseApiExceptionListener implements EventSubscriberInterface
+final class ResponseApiExceptionListener
 {
-    public static function getSubscribedEvents(): array
-    {
-        return [
-            ExceptionEvent::class => ['onKernelException', 255],
-            PreDumpRootSchemaEvent::class => ['addErrorDefinition'],
-        ];
-    }
-
     public function __construct(
         /**
-         * @var ErrorToHttpCodeConverterInterface[]
+         * @var iterable<ErrorToHttpCodeConverterInterface>
          */
         #[TaggedIterator(ErrorToHttpCodeConverterInterface::class)]
         private iterable $errorToHttpCodeConverters = [],
@@ -38,6 +30,7 @@ public function __construct(
         $this->errorToHttpCodeConverters ??= new ConfigurableErrorToHttpCodeConverter();
     }
 
+    #[AsEventListener]
     public function addErrorDefinition(PreDumpRootSchemaEvent $event): void
     {
         $root = $event->getSchema();
@@ -88,6 +81,7 @@ public function addErrorDefinition(PreDumpRootSchemaEvent $event): void
         }
     }
 
+    #[AsEventListener(priority: 255)]
     public function onKernelException(ExceptionEvent $event): void
     {
         $request = $event->getRequest();
@@ -108,9 +102,7 @@ public function onKernelException(ExceptionEvent $event): void
             $data[$this->violationKey] = $this->getConstraintViolationData($error);
         }
 
-        if ($this->debug) {
-            $data['detail'] = $this->getExceptionDetail($error);
-        }
+        $data['detail'] = $this->getExceptionDetail($error);
 
         $event->setResponse(
             new JsonResponse(
@@ -143,10 +135,7 @@ private function getConstraintViolationData(ConstraintViolationListException $ex
         return $errors;
     }
 
-    /**
-     * @return mixed
-     */
-    private function getConstraintPayload(ConstraintViolationInterface $constraintViolation)
+    private function getConstraintPayload(ConstraintViolationInterface $constraintViolation): mixed
     {
         if (!$constraintViolation instanceof ConstraintViolation) {
             return null;
@@ -173,10 +162,10 @@ private function getExceptionDetail(\Throwable $e): array
             foreach (explode("\n", $e->getTraceAsString()) as $line) {
                 $result['stack'][] = $line;
             }
+        }
 
-            if ($previous = $e->getPrevious()) {
-                $result['previous'] = $this->getExceptionDetail($previous);
-            }
+        if ($previous = $e->getPrevious()) {
+            $result['previous'] = $this->getExceptionDetail($previous);
         }
 
         return $result;
diff --git a/packages/open-api/Tests/EventListener/ResponseApiExceptionListenerTest.php b/packages/open-api/Tests/EventListener/ResponseApiExceptionListenerTest.php
index 5b943631..ca9d3dcd 100644
--- a/packages/open-api/Tests/EventListener/ResponseApiExceptionListenerTest.php
+++ b/packages/open-api/Tests/EventListener/ResponseApiExceptionListenerTest.php
@@ -11,7 +11,6 @@
 use Draw\Component\OpenApi\Schema\Root;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Event\ExceptionEvent;
@@ -39,7 +38,9 @@ protected function setUp(): void
             $this->httpKernel = $this->createMock(HttpKernelInterface::class),
             $this->request = $this->createMock(Request::class),
             HttpKernelInterface::MAIN_REQUEST,
-            $this->exception = $this->createMock(\Exception::class)
+            $this->exception = new \Exception(
+                previous: new \Exception()
+            )
         );
 
         $this->request
@@ -48,25 +49,6 @@ protected function setUp(): void
             ->willReturn('json');
     }
 
-    public function testConstruct(): void
-    {
-        static::assertInstanceOf(
-            EventSubscriberInterface::class,
-            $this->object
-        );
-    }
-
-    public function testSubscribedEvents(): void
-    {
-        static::assertSame(
-            [
-                ExceptionEvent::class => ['onKernelException', 255],
-                PreDumpRootSchemaEvent::class => ['addErrorDefinition'],
-            ],
-            $this->object::getSubscribedEvents()
-        );
-    }
-
     /**
      * todo Improve test asser on this.
      */
@@ -135,23 +117,45 @@ public function testOnKernelExceptionJsonResponse(): void
 
     public function testOnKernelExceptionDefaultDebugFalse(): void
     {
+        $exceptionDetail = json_decode(
+            $this->onKernelException()->getContent(),
+            true,
+            512,
+            \JSON_THROW_ON_ERROR
+        )['detail'];
+
         static::assertArrayNotHasKey(
-            'detail',
-            json_decode($this->onKernelException()->getContent(), true, 512, \JSON_THROW_ON_ERROR)
+            'stack',
+            $exceptionDetail
         );
     }
 
     public function testOnKernelExceptionDebugFalse(): void
     {
-        static::assertArrayNotHasKey(
-            'detail',
-            json_decode(
-                $this->onKernelException(
-                    new ResponseApiExceptionListener(debug: false)
-                )->getContent(),
-                true,
-                512,
-                \JSON_THROW_ON_ERROR
+        $exceptionDetail = json_decode(
+            $this->onKernelException(
+                new ResponseApiExceptionListener(debug: false)
+            )->getContent(),
+            true,
+            512,
+            \JSON_THROW_ON_ERROR
+        )['detail'];
+
+        $expectedKeys = ['class', 'message', 'code', 'file', 'line', 'previous'];
+
+        static::assertEmpty(
+            $extraKeys = array_diff(array_keys($exceptionDetail), $expectedKeys),
+            sprintf(
+                'Unexpected keys: %s',
+                implode(', ', $extraKeys)
+            )
+        );
+
+        static::assertEmpty(
+            $missingKeys = array_diff($expectedKeys, array_keys($exceptionDetail)),
+            sprintf(
+                'Missing keys: %s',
+                implode(', ', $missingKeys)
             )
         );
     }
diff --git a/tests/OpenApi/EventListener/ResponseApiExceptionListenerTest.php b/tests/OpenApi/EventListener/ResponseApiExceptionListenerTest.php
new file mode 100644
index 00000000..ad6dd196
--- /dev/null
+++ b/tests/OpenApi/EventListener/ResponseApiExceptionListenerTest.php
@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Tests\OpenApi\EventListener;
+
+use Draw\Bundle\TesterBundle\EventDispatcher\EventListenerTestTrait;
+use Draw\Bundle\TesterBundle\PHPUnit\Extension\SetUpAutowire\AutowiredInterface;
+use Draw\Bundle\TesterBundle\PHPUnit\Extension\SetUpAutowire\AutowireService;
+use Draw\Component\OpenApi\Event\PreDumpRootSchemaEvent;
+use Draw\Component\OpenApi\EventListener\ResponseApiExceptionListener;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+
+class ResponseApiExceptionListenerTest extends KernelTestCase implements AutowiredInterface
+{
+    use EventListenerTestTrait;
+
+    #[AutowireService]
+    private ResponseApiExceptionListener $object;
+
+    public function test(): void
+    {
+        $this->assertEventListenersRegistered(
+            $this->object::class,
+            [
+                'kernel.exception' => ['onKernelException'],
+                PreDumpRootSchemaEvent::class => ['addErrorDefinition'],
+            ]
+        );
+    }
+}