public void Position_and_Direction_with_radius_azimuth_and_declination()
{
var orbitingStand = new OrbitingStand(
10, Constants.PI * 0.75f, Constants.HALF_PI * 0.5f);
var expectedPosition = new Vector3(-5, 7.071068f, 5);
Assert.AreEqual(expectedPosition, orbitingStand.Position,
new Vector3EqualityComparer());
Assert.AreEqual(-expectedPosition.Normalized(), orbitingStand.Direction,
new Vector3EqualityComparer());
}