/**
* @covers Moontoast\Math\BigNumber::sqrt
*/
public function testSqrt()
{
$bn1 = new BigNumber(16);
$bn2 = new BigNumber(17);
$bn3 = clone $bn2;
$this->assertSame($bn1, $bn1->sqrt());
$this->assertSame('4', $bn1->getValue());
$this->assertSame('4', $bn2->sqrt()->getValue());
$bn3->setScale(8);
$this->assertSame('4.12310562', $bn3->sqrt()->getValue());
}