public void FromXna() { Quaternion xna = new Quaternion(6, 7, 8, 9); QuaternionD v = QuaternionD.FromXna(xna); Assert.AreEqual(xna.X, v.X); Assert.AreEqual(xna.Y, v.Y); Assert.AreEqual(xna.Z, v.Z); Assert.AreEqual(xna.W, v.W); }