diff -u b/core/modules/system/tests/modules/database_test/src/Controller/DatabaseTestController.php b/core/modules/system/tests/modules/database_test/src/Controller/DatabaseTestController.php
--- b/core/modules/system/tests/modules/database_test/src/Controller/DatabaseTestController.php
+++ b/core/modules/system/tests/modules/database_test/src/Controller/DatabaseTestController.php
@@ -6,6 +6,7 @@
  */
 
 namespace Drupal\database_test\Controller;
+
 use Symfony\Component\HttpFoundation\JsonResponse;
 
 /**
@@ -20,7 +21,7 @@
    * separate menu callback request; After this request is done, the temporary
    * table should automatically dropped.
    *
-   * @return JsonResponse
+   * @return Symfony\Component\HttpFoundation\JsonResponse
    */
   public function dbQueryTemporary() {
     $table_name = db_query_temporary('SELECT age FROM {test}', array());
@@ -36,7 +37,7 @@
    * This function does care about the page GET parameter, as set by the
    * simpletest HTTP call.
    *
-   * @return JsonResponse
+   * @return Symfony\Component\HttpFoundation\JsonResponse
    */
   public function pagerQueryEven($limit) {
     $query = db_select('test', 't');
@@ -62,7 +63,7 @@
    * This function does care about the page GET parameter, as set by the
    * simpletest HTTP call.
    *
-   * @return JsonResponse
+   * @return Symfony\Component\HttpFoundation\JsonResponse
    */
   public function pagerQueryOdd($limit) {
     $query = db_select('test_task', 't');
@@ -88,7 +89,7 @@
    * This function does care about the page GET parameter, as set by the
    * simpletest HTTP call.
    *
-   * @return JsonResponse
+   * @return Symfony\Component\HttpFoundation\JsonResponse
    */
   public function testTablesort() {
     $header = array(
@@ -120,7 +121,7 @@
    * This function does care about the page GET parameter, as set by the
    * simpletest HTTP call.
    *
-   * @return JsonResponse
+   * @return Symfony\Component\HttpFoundation\JsonResponse
    */
   public function testTablesortFirst() {
     $header = array(