public function testDegToRad()
{
$this->assertTrue(CMathf::equalsZt(CMathf::degToRad(0.0), 0.0));
$this->assertTrue(CMathf::equalsZt(CMathf::degToRad(90.0), CMathf::HALF_PI));
$this->assertTrue(CMathf::equalsZt(CMathf::degToRad(180.0), CMathf::PI));
$this->assertTrue(CMathf::equalsZt(CMathf::degToRad(360.0), CMathf::PI * 2));
$this->assertTrue(CMathf::equalsZt(CMathf::degToRad(90), CMathf::HALF_PI));
}