diff -u b/core/tests/Drupal/KernelTests/Core/Database/InsertTest.php b/core/tests/Drupal/KernelTests/Core/Database/InsertTest.php
--- b/core/tests/Drupal/KernelTests/Core/Database/InsertTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/InsertTest.php
@@ -136,7 +136,7 @@
    * Tests that inserts return the proper auto-increment ID.
    */
   function testInsertLastInsertID() {
-    $id = \Drupal::database()->insert(('test'));
+    $id = \Drupal::database()->insert('test');
     $id ->fields(array(
         'name' => 'Larry',
         'age' => '30',