public function testSqr()
{
$this->assertTrue(CMathf::equalsZt(CMathf::sqr(4.0), 16.0));
$this->assertTrue(CMathf::equalsZt(CMathf::sqr(-5.5), 30.25));
$this->assertTrue(CMathf::sqr(4) === 16.0);
$this->assertTrue(CMathf::sqr(-5) === 25.0);
}