/**
* Decreases the stock level.
*
* @author David Pauli <*****@*****.**>
* @since 0.1.0
* @api
* @param float $step The value the stock level should be decreased, default value is 1.
* @return float|null The new stock level of the product.
*/
public function decreaseStockLevel($step = 1.0)
{
$this->getStockLevel();
// cast int to float
if (InputValidator::isInt($step)) {
$step = (double) $step;
}
if (!InputValidator::isRangedFloat($step, 0.0)) {
return $this->stockLevel;
}
$this->changeStockLevel((double) $step * -1);
return $this->stockLevel;
}
/**
* @group utility
*/
function testIsInt()
{
$this->assertFalse(InputValidator::isInt("String"));
$this->assertFalse(InputValidator::isInt(array()));
$this->assertFalse(InputValidator::isInt(array(12)));
$this->assertTrue(InputValidator::isInt(3));
$this->assertFalse(InputValidator::isInt(null));
$this->assertFalse(InputValidator::isInt(1.2));
$this->assertTrue(InputValidator::isInt(-3));
}