public function testTrimExtend()
{
isSame('multi', Filter::_("\n\r" . ' multi ' . chr(0xe3) . chr(0x80) . chr(0x80), 'trimExtend'));
isSame('multi', Filter::_(chr(0xc2) . chr(0xa0) . "\n\r" . ' multi ' . "\t", 'trimExtend'));
isSame('clean', Filter::_('clean', 'trim'));
}