Issue #3177557 by alexpott, andypost, dawehner: \Drupal\error_test\Controller\ErrorTestController::generateWarnings() notice is not a notice in PHP 8

core/modules/system/tests/modules/error_test/src/Controller/ErrorTestController.php

@@ -44,8 +44,8 @@ class ErrorTestController extends ControllerBase {
     // Tell Drupal error reporter to send errors to Simpletest or not.
     define('SIMPLETEST_COLLECT_ERRORS', $collect_errors);
     // This will generate a notice.
-    $bananas = [];
-    $monkey_love = $bananas[1];
+    $notice = new \stdClass();
+    $notice == 1 ? 1 : 0;
     // This will generate a warning.
     $obj = new \stdClass();
     $obj->p =& $obj;

core/modules/system/tests/src/Functional/System/ErrorHandlerTest.php

@@ -31,7 +31,7 @@ class ErrorHandlerTest extends BrowserTestBase {
     $config = $this->config('system.logging');
     $error_notice = [
       '%type' => 'Notice',
-      '@message' => 'Undefined offset: 1',
+      '@message' => 'Object of class stdClass could not be converted to int',
       '%function' => 'Drupal\error_test\Controller\ErrorTestController->generateWarnings()',
       '%file' => drupal_get_path('module', 'error_test') . '/error_test.module',
     ];