diff --git a/tests/Integration/Twig/Extension/MarkdowbExtensionTest.php b/tests/Integration/Twig/Extension/MarkdowbExtensionTest.php
new file mode 100644
index 0000000..55c3647
--- /dev/null
+++ b/tests/Integration/Twig/Extension/MarkdowbExtensionTest.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Integration\Twig\Extension;
+
+use App\Twig\Extension\MarkdownExtension;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+
+final class MarkdowbExtensionTest extends KernelTestCase
+{
+    public function testResponseExtension(): void
+    {
+        self::bootKernel();
+        $extension = $this->getContainer()->get(MarkdownExtension::class);
+        self::assertNotEmpty($extension->getFilters());
+    }
+}