public function testSqrt()
{
$this->assertTrue(CMathf::equalsZt(CMathf::sqrt(16.0), 4.0));
$this->assertTrue(CMathf::equalsZt(CMathf::sqrt(30.25), 5.5));
$this->assertTrue(CMathf::sqrt(16) === 4.0);
$this->assertTrue(CMathf::sqrt(49) === 7.0);
}