public void TestNextStep()
{
var game = new Game(new HashSet<Size> { new Size(0, 0), new Size(1, 0), new Size(-1, 0) });
CollectionAssert.AreEquivalent(
new HashSet<Size> { new Size(0, 0), new Size(0, 1), new Size(0, -1) },
game.NextStep()
);
}
static void Run(Game game)
{
SlowConsolePrint(game.ToString());
Run(new Game(game.NextStep()));
}