public static IEnumerable <TestCaseData> GetCastlingMoves(Color color, Move move)
{
const string emptyFenWhiteToMove = "4k3/8/8/8/8/8/8/4K3 w - - 0 1";
const string emptyFenBlackToMove = "4k3/8/8/8/8/8/8/4K3 b - - 0 1";
var rookInitialSquareIndex = MoveHelpers.GetRookMoveForCastleMove(move).SourceIndex;
var between = BoardHelpers.InBetween(rookInitialSquareIndex, move.SourceIndex);
var blockerPermutations = MovingPieceService.GetAllPermutationsOfSetBits(between.GetSetBits(), 0, 0)
.Where(x => x != 0);
var fen = color == Color.Black ? emptyFenBlackToMove : emptyFenWhiteToMove;
var board = fenTextToBoard.Translate(fen);
foreach (var permutation in blockerPermutations)
{
var editedBoard = (Board)board.Clone();
editedBoard.Occupancy[(int)color][(int)Piece.King] = permutation;
var strBlockers = string.Join(", ", permutation.GetSetBits());
yield return(new TestCaseData(editedBoard, move)
.SetName($"Blockers on indices {strBlockers}")
.Returns(MoveError.CastleOccupancyBetween));
}
yield return(new TestCaseData(board, move)
.SetName("No Blockers")
.Returns(MoveError.NoneSet));
}
