diff --git a/DependencyInjection/BdfQueueMessengerExtension.php b/DependencyInjection/BdfQueueMessengerExtension.php
index a059adb..a901591 100644
--- a/DependencyInjection/BdfQueueMessengerExtension.php
+++ b/DependencyInjection/BdfQueueMessengerExtension.php
@@ -12,7 +12,7 @@
  */
 class BdfQueueMessengerExtension extends Extension
 {
-    public function load(array $configs, ContainerBuilder $container)
+    public function load(array $configs, ContainerBuilder $container): void
     {
         $loader = new YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
         $loader->load('queue_messenger.yaml');
diff --git a/Tests/Functional/BundleIntegrationTest.php b/Tests/Functional/BundleIntegrationTest.php
new file mode 100644
index 0000000..32fe371
--- /dev/null
+++ b/Tests/Functional/BundleIntegrationTest.php
@@ -0,0 +1,149 @@
+<?php
+
+namespace Bdf\QueueMessengerBundle\Tests\Functional;
+
+use Bdf\QueueMessengerBundle\Tests\Functional\Fixtures\TestKernel;
+use Bdf\QueueMessengerBundle\Tests\Functional\Fixtures\TestMessage;
+use Bdf\QueueMessengerBundle\Tests\Functional\Fixtures\TestMessageHandler;
+use Bdf\QueueMessengerBundle\Transport\Handler\MessageBusHandler;
+use Bdf\QueueMessengerBundle\Transport\QueueTransport;
+use Bdf\QueueMessengerBundle\Transport\QueueTransportFactory;
+use Bdf\QueueMessengerBundle\Transport\Stamp\BdfQueueReceivedStamp;
+use Bdf\QueueMessengerBundle\Transport\Stamp\PhpStampsSerializer;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\Messenger\Envelope;
+use Symfony\Component\Messenger\Event\WorkerRunningEvent;
+use Symfony\Component\Messenger\EventListener\StopWorkerOnMessageLimitListener;
+use Symfony\Component\Messenger\MessageBusInterface;
+use Symfony\Component\Messenger\Stamp\SentStamp;
+use Symfony\Component\Messenger\Worker;
+
+/**
+ * Boots a real Symfony container with the bundle registered and checks that its
+ * services are wired and that the messenger transport works end to end against
+ * an in-memory queue.
+ */
+class BundleIntegrationTest extends KernelTestCase
+{
+    protected static function getKernelClass(): string
+    {
+        return TestKernel::class;
+    }
+
+    public function testTransportFactoryIsRegistered()
+    {
+        self::bootKernel();
+
+        $factory = self::getContainer()->get('bdf_queue.messenger_transport.factory');
+
+        $this->assertInstanceOf(QueueTransportFactory::class, $factory);
+    }
+
+    public function testDefaultStampSerializerIsThePhpOne()
+    {
+        self::bootKernel();
+
+        $serializer = self::getContainer()->get('bdf_queue.messenger_transport.stamp_serializer');
+
+        $this->assertInstanceOf(PhpStampsSerializer::class, $serializer);
+    }
+
+    public function testMessageBusHandlerIsRegistered()
+    {
+        self::bootKernel();
+
+        $handler = self::getContainer()->get(MessageBusHandler::class);
+
+        $this->assertInstanceOf(MessageBusHandler::class, $handler);
+    }
+
+    public function testMessengerBuildsAQueueTransportForBdfQueueDsn()
+    {
+        self::bootKernel();
+
+        // The transport is built by symfony messenger using the tagged factory
+        // of the bundle : getting a QueueTransport proves the factory is
+        // properly tagged as "messenger.transport_factory".
+        $transport = self::getContainer()->get('messenger.transport.bdf');
+
+        $this->assertInstanceOf(QueueTransport::class, $transport);
+    }
+
+    public function testSendAndReceiveRoundTrip()
+    {
+        self::bootKernel();
+
+        /** @var QueueTransport $transport */
+        $transport = self::getContainer()->get('messenger.transport.bdf');
+
+        $message = new TestMessage('hello');
+        $transport->send(new Envelope($message));
+
+        $received = iterator_to_array($transport->get());
+
+        $this->assertCount(1, $received);
+
+        /** @var Envelope $envelope */
+        $envelope = $received[0];
+        $this->assertEquals($message, $envelope->getMessage());
+        $this->assertNotNull($envelope->last(BdfQueueReceivedStamp::class));
+
+        // Acknowledging must not throw and should leave the queue empty.
+        $transport->ack($envelope);
+
+        $this->assertSame([], iterator_to_array($transport->get()));
+    }
+
+    public function testDispatchThroughMessengerBusRoutesToTransportAndIsHandled()
+    {
+        self::bootKernel();
+
+        $container = self::getContainer();
+
+        /** @var MessageBusInterface $bus */
+        $bus = $container->get('messenger.default_bus');
+        /** @var TestMessageHandler $handler */
+        $handler = $container->get(TestMessageHandler::class);
+
+        $message = new TestMessage('via-bus');
+
+        // Dispatch through the bus : the routing sends the message to the bdf
+        // transport asynchronously, so it must NOT be handled in process yet.
+        $envelope = $bus->dispatch($message);
+
+        $this->assertNotNull($envelope->last(SentStamp::class), 'The message should have been sent to a transport');
+        $this->assertSame([], $handler->handled, 'An async message must not be handled during dispatch');
+
+        // Consume the transport with a real worker : it receives the message
+        // from the queue and dispatches it back to the bus for handling.
+        $worker = new Worker(
+            ['bdf' => $container->get('messenger.transport.bdf')],
+            $bus,
+            $this->workerEventDispatcher()
+        );
+        $worker->run(['sleep' => 0]);
+
+        $this->assertCount(1, $handler->handled);
+        $this->assertEquals($message, $handler->handled[0]);
+    }
+
+    /**
+     * Event dispatcher stopping the worker as soon as one message is handled,
+     * with a wall-clock deadline as a safety net so the test can never hang.
+     */
+    private function workerEventDispatcher(): EventDispatcher
+    {
+        $dispatcher = new EventDispatcher();
+        $dispatcher->addSubscriber(new StopWorkerOnMessageLimitListener(1));
+
+        $deadline = microtime(true) + 5;
+        $dispatcher->addListener(WorkerRunningEvent::class, function (WorkerRunningEvent $event) use ($deadline) {
+            if (microtime(true) >= $deadline) {
+                $event->getWorker()->stop();
+            }
+        });
+
+        return $dispatcher;
+    }
+}
diff --git a/Tests/Functional/Fixtures/DestinationManagerFactory.php b/Tests/Functional/Fixtures/DestinationManagerFactory.php
new file mode 100644
index 0000000..b31873b
--- /dev/null
+++ b/Tests/Functional/Fixtures/DestinationManagerFactory.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace Bdf\QueueMessengerBundle\Tests\Functional\Fixtures;
+
+use Bdf\Queue\Connection\Factory\CachedConnectionDriverFactory;
+use Bdf\Queue\Connection\Factory\ResolverConnectionDriverFactory;
+use Bdf\Queue\Connection\Memory\MemoryConnection;
+use Bdf\Queue\Destination\ConfigurationDestinationFactory;
+use Bdf\Queue\Destination\DestinationManager;
+use Bdf\Queue\Destination\DsnDestinationFactory;
+
+/**
+ * Build a "real" destination manager backed by an in-memory connection.
+ *
+ * This service is normally provided by the bdf-queue framework bundle. It is
+ * redefined here so the messenger bundle can be booted in a real container
+ * without pulling the whole queue bundle, while still exercising the actual
+ * destination/consumer stack (no mock).
+ */
+final class DestinationManagerFactory
+{
+    public static function create(): DestinationManager
+    {
+        $connectionFactory = new ResolverConnectionDriverFactory([
+            'memory-queue' => 'memory://localhost',
+        ]);
+        $connectionFactory->addDriverResolver('memory', function () {
+            return new MemoryConnection();
+        });
+
+        // Cache the connections so a message sent by the transport and the
+        // consumer that reads it back share the same in-memory storage.
+        $connectionFactory = new CachedConnectionDriverFactory($connectionFactory);
+
+        return new DestinationManager(
+            $connectionFactory,
+            new ConfigurationDestinationFactory([], new DsnDestinationFactory($connectionFactory))
+        );
+    }
+}
diff --git a/Tests/Functional/Fixtures/PublicServicesPass.php b/Tests/Functional/Fixtures/PublicServicesPass.php
new file mode 100644
index 0000000..1d627f1
--- /dev/null
+++ b/Tests/Functional/Fixtures/PublicServicesPass.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace Bdf\QueueMessengerBundle\Tests\Functional\Fixtures;
+
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+/**
+ * Force some bundle services to stay public so they can be fetched from the
+ * test container and are not removed as "unused" in the minimal test kernel.
+ */
+final class PublicServicesPass implements CompilerPassInterface
+{
+    /**
+     * @var string[]
+     */
+    private $ids;
+
+    /**
+     * @param string[] $ids
+     */
+    public function __construct(array $ids)
+    {
+        $this->ids = $ids;
+    }
+
+    public function process(ContainerBuilder $container): void
+    {
+        foreach ($this->ids as $id) {
+            if ($container->hasDefinition($id)) {
+                $container->getDefinition($id)->setPublic(true);
+            } elseif ($container->hasAlias($id)) {
+                $container->getAlias($id)->setPublic(true);
+            }
+        }
+    }
+}
diff --git a/Tests/Functional/Fixtures/TestKernel.php b/Tests/Functional/Fixtures/TestKernel.php
new file mode 100644
index 0000000..45c8b60
--- /dev/null
+++ b/Tests/Functional/Fixtures/TestKernel.php
@@ -0,0 +1,98 @@
+<?php
+
+namespace Bdf\QueueMessengerBundle\Tests\Functional\Fixtures;
+
+use Bdf\Queue\Destination\DestinationManager;
+use Bdf\QueueMessengerBundle\BdfQueueMessengerBundle;
+use Bdf\QueueMessengerBundle\Transport\Handler\MessageBusHandler;
+use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Component\Config\Loader\LoaderInterface;
+use Symfony\Component\DependencyInjection\Compiler\PassConfig;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\HttpKernel\Kernel;
+
+/**
+ * Minimal kernel booting the framework bundle together with the messenger
+ * bundle under test.
+ */
+class TestKernel extends Kernel
+{
+    public function registerBundles(): iterable
+    {
+        return [
+            new FrameworkBundle(),
+            new BdfQueueMessengerBundle(),
+        ];
+    }
+
+    protected function build(ContainerBuilder $container): void
+    {
+        $container->addCompilerPass(
+            new PublicServicesPass([
+                MessageBusHandler::class,
+                'bdf_queue.messenger_bus_handler',
+                'messenger.default_bus',
+            ]),
+            PassConfig::TYPE_BEFORE_REMOVING
+        );
+    }
+
+    public function registerContainerConfiguration(LoaderInterface $loader): void
+    {
+        $loader->load(function (ContainerBuilder $container) {
+            $config = [
+                'test' => true,
+                'secret' => 'test',
+                'http_method_override' => false,
+                'php_errors' => ['log' => true],
+                'messenger' => [
+                    'transports' => [
+                        'bdf' => 'bdfqueue://memory-queue',
+                    ],
+                    'routing' => [
+                        TestMessage::class => ['bdf'],
+                    ],
+                ],
+            ];
+
+            // Introduced in Symfony 6.4, unknown (and thus rejected) on 5.4.
+            if (Kernel::VERSION_ID >= 60400) {
+                $config['handle_all_throwables'] = true;
+            }
+
+            $container->loadFromExtension('framework', $config);
+
+            // Service usually provided by the bdf-queue framework bundle.
+            $container
+                ->register('bdf_queue.destination_manager', DestinationManager::class)
+                ->setFactory([DestinationManagerFactory::class, 'create'])
+                ->setPublic(true);
+
+            // Handler used to assert the dispatch -> transport -> worker flow.
+            $container
+                ->register(TestMessageHandler::class, TestMessageHandler::class)
+                ->addTag('messenger.message_handler')
+                ->setPublic(true);
+        });
+    }
+
+    public function getCacheDir(): string
+    {
+        return $this->buildDir().'/cache';
+    }
+
+    public function getBuildDir(): string
+    {
+        return $this->buildDir().'/build';
+    }
+
+    public function getLogDir(): string
+    {
+        return $this->buildDir().'/log';
+    }
+
+    private function buildDir(): string
+    {
+        return sys_get_temp_dir().'/bdf_queue_messenger_bundle_tests/'.$this->environment;
+    }
+}
diff --git a/Tests/Functional/Fixtures/TestMessage.php b/Tests/Functional/Fixtures/TestMessage.php
new file mode 100644
index 0000000..f7191a6
--- /dev/null
+++ b/Tests/Functional/Fixtures/TestMessage.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Bdf\QueueMessengerBundle\Tests\Functional\Fixtures;
+
+/**
+ * Simple serializable message used to check the transport round trip.
+ */
+final class TestMessage
+{
+    /**
+     * @var string
+     */
+    public $content;
+
+    public function __construct(string $content = '')
+    {
+        $this->content = $content;
+    }
+}
diff --git a/Tests/Functional/Fixtures/TestMessageHandler.php b/Tests/Functional/Fixtures/TestMessageHandler.php
new file mode 100644
index 0000000..112bf38
--- /dev/null
+++ b/Tests/Functional/Fixtures/TestMessageHandler.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace Bdf\QueueMessengerBundle\Tests\Functional\Fixtures;
+
+/**
+ * Records the messages it handles so the test can assert the full
+ * dispatch -> transport -> worker -> handler round trip.
+ */
+class TestMessageHandler
+{
+    /**
+     * @var TestMessage[]
+     */
+    public $handled = [];
+
+    public function __invoke(TestMessage $message): void
+    {
+        $this->handled[] = $message;
+    }
+}