public function testPositiveAndNegative()
{
$val = val('1 eur');
batchEqualDumps(array(array('1 eur', $val->positive()->dump(false)), array('-1 eur', $val->negative()->dump(false)), array('-1 eur', $val->negative()->dump(false)), array('1 eur', $val->positive()->dump(false))));
}