Smarty not wornking prestashop 1.7.4

[Diego Alves]

public function hookDisplayFooter()
{

    $this->context->smarty->assign('varteste', "olá");
    return $this->display(__FILE__, 'teste.tpl');

}

 

 

in my teste.tpl

{{ $varteste }

shows $varteste when the template is displayed