/**
* {@inheritdoc}
*/
public function calculate($base, TaxRateInterface $rate)
{
if ($rate->isIncludedInPrice()) {
return (int) round($base - $base / (1 + $rate->getAmount()));
}
return (int) round($base * $rate->getAmount());
}
function it_calculates_correct_tax_for_given_base_if_rate_is_included_in_price(TaxRateInterface $rate)
{
$rate->isIncludedInPrice()->willReturn(true);
$rate->getAmount()->willReturn(0.23);
$this->calculate(10000, $rate)->shouldReturn(1870);
$rate->getAmount()->willReturn(0.2);
$this->calculate(315, $rate)->shouldReturn(53);
}