public function case_to_upper()
{
$this->given($string = new LUT('σ \'αγαπώ'))->when($result = $string->toUpperCase())->then->object($result)->isIdenticalTo($string)->string((string) $result)->isEqualTo('Σ \'ΑΓΑΠΏ')->given($string = new LUT('je t\'aime'))->when($result = $string->toUpperCase())->then->object($result)->isIdenticalTo($string)->string((string) $result)->isEqualTo('JE T\'AIME');
}
