public void InRange()
{
var pos1 = new Position(0, 0);
var pos2 = new Position(0, 500);
var pos4 = new Position(500, 500);
var pos5 = new Position(-500, -500);
Assert.Equal(true, pos1.InRange(pos2, 500));
Assert.Equal(false, pos1.InRange(pos2, 499));
Assert.Equal(true, pos4.InRange(pos5, 1415));
Assert.Equal(false, pos4.InRange(pos5, 1413));
}