diff --git a/core/modules/menu/lib/Drupal/menu/Tests/MenuTest.php b/core/modules/menu/lib/Drupal/menu/Tests/MenuTest.php
index 75532b0..88283cc 100644
--- a/core/modules/menu/lib/Drupal/menu/Tests/MenuTest.php
+++ b/core/modules/menu/lib/Drupal/menu/Tests/MenuTest.php
@@ -182,6 +182,14 @@ function deleteCustomMenu($menu) {
     // Test if all menu links associated to the menu were removed from database.
     $result = entity_load_multiple_by_properties('menu_link', array('menu_name' => $menu_name));
     $this->assertFalse($result, 'All menu links associated to the custom menu were deleted.');
+
+    // Make sure there's no delete button on system menus.
+    $this->drupalGet('admin/structure/menu/manage/main/edit');
+    $this->assertNoRaw('edit-delete', 'The delete button was not found');
+
+    // Try to delete the main menu.
+    $this->drupalGet('admin/structure/menu/manage/main/delete');
+    $this->assertText(t('You are not authorized to access this page.'));
   }
 
   /**