Issue #2640516: Support paging through multiple requests

migrate_example/tests/src/Kernel/MigrateExampleTest.php

@@ -46,6 +46,8 @@ final class MigrateExampleTest extends MigrateDrupalTestBase {
     \Drupal::service('module_installer')->install(['migrate_example_setup']);
     $this->installConfig(['migrate_example_setup']);
 
+    $this->startCollectingMessages();
+
     // Execute "beer" migrations from 'migrate_example' module.
     $this->executeMigration('beer_user');
     $this->executeMigrations([