diff --git a/tests/State/AutoRegisterDomainProviderTest.php b/tests/State/AutoRegisterDomainProviderTest.php
index 2a4f390..5a0564e 100644
--- a/tests/State/AutoRegisterDomainProviderTest.php
+++ b/tests/State/AutoRegisterDomainProviderTest.php
@@ -27,6 +27,16 @@ final class AutoRegisterDomainProviderTest extends ApiTestCase
         $this->assertMatchesResourceItemJsonSchema(Domain::class);
     }
 
+    #[DependsExternal(RDAPServiceTest::class, 'testUpdateRdapServers')]
+    public function testRegisterDomainAnonymousUnauthorized(): void
+    {
+        $client = $this->createClient();
+        $client->request('GET', '/api/domains/example.com');
+
+        $this->assertResponseStatusCodeSame(401);
+    }
+
+
     #[DependsExternal(RDAPServiceTest::class, 'testUpdateRdapServers')]
     public function testRegisterDomainAlreadyUpdated(): void
     {