diff -u b/core/modules/migrate_drupal_ui/tests/src/Functional/MigrateUpgradeTestBase.php b/core/modules/migrate_drupal_ui/tests/src/Functional/MigrateUpgradeTestBase.php
--- b/core/modules/migrate_drupal_ui/tests/src/Functional/MigrateUpgradeTestBase.php
+++ b/core/modules/migrate_drupal_ui/tests/src/Functional/MigrateUpgradeTestBase.php
@@ -3,6 +3,7 @@
 namespace Drupal\Tests\migrate_drupal_ui\Functional;
 
 use Drupal\Core\Database\Database;
+use Drupal\migrate\Plugin\MigrateIdMapInterface;
 use Drupal\migrate_drupal\MigrationConfigurationTrait;
 use Drupal\Tests\BrowserTestBase;
 use Drupal\Tests\migrate_drupal\Traits\CreateTestContentEntitiesTrait;
only in patch2:
unchanged:
--- a/core/modules/migrate_drupal_ui/tests/src/Functional/MigrateUpgradeReviewPageTestBase.php
+++ b/core/modules/migrate_drupal_ui/tests/src/Functional/MigrateUpgradeReviewPageTestBase.php
@@ -121,4 +121,11 @@ protected function getEntityCounts() {
     return [];
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  protected function getEntityCountsIncremental() {
+    return [];
+  }
+
 }