diff --git a/tests/DemosTest.php b/tests/DemosTest.php
index 0e40edf606..44e7de20ab 100644
--- a/tests/DemosTest.php
+++ b/tests/DemosTest.php
@@ -149,8 +149,10 @@ protected function getClient(): Client
                     $app->run();
                 }
 
-                if (\Closure::bind(fn () => $app->sticky_get_arguments, null, App::class)() !== ['__atk_json' => false, '__atk_tab' => false]) {
-                    throw new \Atk4\Ui\Exception('Global GET sticky must never be set by any component');
+                // assert no test sets app/global GET sticky
+                $appSticky = \Closure::bind(fn () => $app->sticky_get_arguments, null, App::class)();
+                if ($appSticky !== ['__atk_json' => false, '__atk_tab' => false]) {
+                    throw new \Atk4\Ui\Exception('Global GET sticky must never be set by any component' . print_r($appSticky, true));
                 }
             } catch (\Throwable $e) {
                 // session_start() or ini_set() functions can be used only with native HTTP tests