diff --git a/tests/Unit/EventListener/SendMessageToTransportsEventListenerTest.php b/tests/Unit/EventListener/SendMessageToTransportsEventListenerTest.php
new file mode 100644
index 0000000..3f5533d
--- /dev/null
+++ b/tests/Unit/EventListener/SendMessageToTransportsEventListenerTest.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace Tienvx\Bundle\PactProviderBundle\Tests\Unit\EventListener;
+
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Messenger\Envelope;
+use Symfony\Component\Messenger\Event\SendMessageToTransportsEvent;
+use Tienvx\Bundle\PactMessengerBundle\EventListener\SendMessageToTransportsEventListener;
+use Tienvx\Bundle\PactMessengerBundle\Service\EnvelopeCollectorInterface;
+use Tienvx\Bundle\PactMessengerBundle\Tests\TestApplication\Message\UserCreated;
+
+class SendMessageToTransportsEventListenerTest extends TestCase
+{
+    private SendMessageToTransportsEventListener $listener;
+    protected EnvelopeCollectorInterface|MockObject $collector;
+
+    protected function setUp(): void
+    {
+        $this->collector = $this->createMock(EnvelopeCollectorInterface::class);
+        $this->listener = new SendMessageToTransportsEventListener($this->collector);
+    }
+
+    public function testCollect(): void
+    {
+        $event = new SendMessageToTransportsEvent($envelop = new Envelope(new UserCreated(123)), ['async']);
+        $this->collector
+            ->expects($this->once())
+            ->method('collect')
+            ->with($envelop);
+        call_user_func($this->listener, $event);
+    }
+}