diff --git a/backend/tests/Unit/Auth/UseCases/LogoutTest.php b/backend/tests/Unit/Auth/UseCases/LogoutTest.php
index 6697e81..2b28630 100644
--- a/backend/tests/Unit/Auth/UseCases/LogoutTest.php
+++ b/backend/tests/Unit/Auth/UseCases/LogoutTest.php
@@ -36,4 +36,11 @@ class LogoutTest extends TestCase
 
         $this->assertNull($this->sessionRepo->findByToken('session-token'));
     }
+
+    public function testDeletesMissingTokenIsIdempotent(): void
+    {
+        $this->logout->execute('nonexistent-token');
+
+        $this->assertNull($this->sessionRepo->findByToken('nonexistent-token'));
+    }
 }