public function testSubtract()
{
$amount100 = new Amount('100');
$amount50 = $amount100->subtract(new Amount('50'));
$this->assertSame('100', $amount100->getString(0));
$this->assertSame('50', $amount50->getString(0));
}
/**
* Get new Amount with the value of $amount subtracted from instance
*
* @param Amount $amount
* @param integer $precision
* @return Amount
*/
public function subtract(Amount $amount, $precision = -1)
{
$this->validateCurrency($amount);
return parent::subtract($amount, $precision);
}