public function testReverseFilterOnNonUTF8String()
{
$twig = new Twig_Environment($this->getMock('Twig_LoaderInterface'));
$twig->setCharset('ISO-8859-1');
$input = iconv('UTF-8', 'ISO-8859-1', 'Äé');
$output = iconv('ISO-8859-1', 'UTF-8', twig_reverse_filter($twig, $input));
$this->assertEquals($output, 'éÄ');
}