public void TestFromQuaternion()
{
UnitQuaternion quaternion = UnitQuaternion.Identity;
Matrix3By3 matrix = new Matrix3By3(quaternion);
Assert.AreEqual(1.0, matrix.M11);
Assert.AreEqual(0.0, matrix.M12);
Assert.AreEqual(0.0, matrix.M13);
Assert.AreEqual(0.0, matrix.M21);
Assert.AreEqual(1.0, matrix.M22);
Assert.AreEqual(0.0, matrix.M23);
Assert.AreEqual(0.0, matrix.M31);
Assert.AreEqual(0.0, matrix.M32);
Assert.AreEqual(1.0, matrix.M33);
}