public void Day06Part2()
{
var lights = new int[1000, 1000];
Day06.ParseLine2("turn on 0,0 through 0,0", ref lights);
var result1 = Day06.Count2(lights);
Assert.IsTrue(result1 == 1);
Day06.ParseLine2("toggle 0,0 through 999,999", ref lights);
var result2 = Day06.Count2(lights);
Assert.IsTrue(result2 == 2000001);
}