public function testPercent()
{
$discountSave = val('20 eur');
$itemPrice = val('100 eur');
batchEqualDumps(array(array('20 %', $discountSave->percent($itemPrice)->dump(false)), array('40 %', val('10 eur')->percent('50 usd')->dump(false)), array('60 %', val('10 eur')->percent('50 usd', true)->dump(false))));
}