Issue #2367835 by rpayanm, andypost: Fixed FormBuilderTest namespace.

core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php

@@ -5,7 +5,7 @@
  * Contains \Drupal\Tests\Core\Form\FormBuilderTest.
  */
 
-namespace Drupal\Tests\Core\Form {
+namespace Drupal\Tests\Core\Form;
 
 use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
 use Drupal\Core\Form\EnforcedResponseException;
@@ -419,12 +419,3 @@ public static function create(ContainerInterface $container) {
     return new static();
   }
 }
-
-}
-
-namespace {
-  use Drupal\Core\Form\FormStateInterface;
-
-  function test_form_id_custom_submit(array &$form, FormStateInterface $form_state) {
-  }
-}