function it_can_subtract(Accountant $accountant, Money $money1, Money $money2, Money $money3)
{
$accountant->subtract($money1, $money2)->willReturn($money3);
$this->subtract($money1, $money2)->shouldReturn($money3);
}
/**
* $money1 - $money2
*
* @param Money\Money $money1
* @param Money\Money $money2
* @return Money\Money
*/
public function subtract(Money\Money $money1, Money\Money $money2)
{
return $this->accountant->subtract($money1, $money2);
}