diff --git a/tests/Controller/OAuthControllerTest.php b/tests/Controller/OAuthControllerTest.php
index 20f4a54..1d8fdc7 100644
--- a/tests/Controller/OAuthControllerTest.php
+++ b/tests/Controller/OAuthControllerTest.php
@@ -22,4 +22,13 @@ class OAuthControllerTest extends WebTestCase
 
         self::assertResponseRedirects('/');
     }
+
+    public function testSsoCheckRedirectsToLogin(): void
+    {
+        $client = static::createClient();
+        $client->request('GET', '/connection/sso/check');
+
+        // Without OAuth token, the authenticator redirects to login
+        self::assertResponseRedirects();
+    }
 }