/**
* Calculate the required wrapping paper area for given box plus
* the smallest side extra used for overlap
*
* @param Box $box
* @return int|float
*/
public function calculateWrappingPaper(Box $box)
{
$top = $box->getLength() * $box->getWidth();
$side = $box->getWidth() * $box->getHeight();
$front = $box->getHeight() * $box->getLength();
$extra = min($top, $side, $front);
return 2 * $top + 2 * $side + 2 * $front + $extra;
}
public function testGetLength()
{
$box = new Box(5);
$length = $box->getLength();
$this->assertEquals(5, $length);
}