public void RotateDirection_ReturnsRotated()
 {
     Assert.AreEqual(OrthogonalLine.Direction.Bottom, OrthogonalLine.RotateDirection(OrthogonalLine.Direction.Right, 90));
     Assert.AreEqual(OrthogonalLine.Direction.Top, OrthogonalLine.RotateDirection(OrthogonalLine.Direction.Bottom, -180));
 }