only in patch2:
unchanged:
--- a/core/modules/views_ui/src/Tests/UITestBase.php
+++ b/core/modules/views_ui/src/Tests/UITestBase.php
@@ -2,6 +2,8 @@
 
 namespace Drupal\views_ui\Tests;
 
+@trigger_error('\Drupal\views_ui\Tests\UITestBase is deprecated in Drupal 8.4.0 and will be removed before Drupal 9.0.0. Instead, use \Drupal\Tests\views_ui\Functional\UITestBase', E_USER_DEPRECATED);
+
 use Drupal\views\Tests\ViewTestBase;
 
 /**