public MiniBoard Copy()
{
var c = new MiniBoard();
c._state = _state;
c._x = _x;
c._o = _o;
return(c);
}
public void TestMiniBoard()
{
var board = new MiniBoard();
Assert.AreEqual(board.Probability(Player.X), 0.5, 0.05, "a new board has even probability for X");
Assert.AreEqual(board.Probability(Player.O), 0.5, 0.05, "same for O");
var moves = board.Moves();
var expected = Enumerable.Range(0, 9).ToList();
CollectionAssert.AreEqual(expected, moves, "all nine moves are available");
var hash = board.GetHashCode();
Assert.AreEqual(0, hash, "proper hash for an empty board");
var p1 = board.Probability(Player.X);
board.MakeMove(4, Player.X);
var p2 = board.Probability(Player.X);
board.MakeMove(3, Player.X);
var p3 = board.Probability(Player.X);
board.MakeMove(5, Player.X);
var p4 = board.Probability(Player.X);
Assert.Greater(p2, p1);
Assert.Greater(p3, p2);
Assert.Greater(p4, p3);
Assert.AreEqual(p4, 1.0, "exact match on a win");
moves = board.Moves();
expected = new List <int> {
0, 1, 2, 6, 7, 8
};
CollectionAssert.AreEqual(expected, moves, "six moves are left");
p1 = board.Probability(Player.O);
Assert.AreEqual(0.0, p1);
board.MakeMove(6, Player.O);
p2 = board.Probability(Player.O);
Assert.AreEqual(0.0, p2);
board.MakeMove(7, Player.O);
p3 = board.Probability(Player.O);
Assert.AreEqual(0.0, p3);
board.MakeMove(8, Player.O);
p4 = board.Probability(Player.O);
Assert.AreEqual(0.0, p4);
}