public void Collision_CenterRects()
{
Rectangle A = new Rectangle(0, 0, 5, 5); // center = 3
Rectangle B = new Rectangle(1000, -500, 10, 10);
Debug.Assert(Collision.CenterRects(A, B) == new Rectangle(-3, -3, 10, 10), "1"); // -3 and not -2.5 because rectangle only uses ints...
}