protected function addNewUser($app, $username, $displayname, $role, $enabled = true)
{
$user = ['username' => $username, 'password' => 'password', 'email' => $username . '@example.com', 'displayname' => $displayname, 'roles' => [$role], 'enabled' => $enabled];
$app['users']->saveUser(array_merge($app['users']->getEmptyUser(), $user));
$app['users']->users = [];
}