feat: enhance FEN and PGN parsers with additional test cases and coverage improvements
This commit is contained in:
@@ -101,3 +101,34 @@ class FenParserTest extends AnyFunSuite with Matchers:
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val gameState = FenParser.parseFen(fen)
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gameState.isDefined shouldBe false
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test("parseFen: castling '-' produces CastlingRights.None for both sides"):
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val fen = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w - - 0 1"
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val gameState = FenParser.parseFen(fen)
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gameState.isDefined shouldBe true
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gameState.get.castlingWhite.kingSide shouldBe false
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gameState.get.castlingWhite.queenSide shouldBe false
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gameState.get.castlingBlack.kingSide shouldBe false
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gameState.get.castlingBlack.queenSide shouldBe false
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test("parseBoard: returns None when a rank has too many files (overflow beyond 8)"):
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// "9" alone would advance fileIdx to 9, exceeding 8 → None
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val fen = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBN9"
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val board = FenParser.parseBoard(fen)
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board shouldBe empty
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test("parseBoard: returns None when a rank fails to parse (invalid middle rank)"):
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// Invalid character 'X' in rank 4 should cause failure
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val fen = "rnbqkbnr/pppppppp/8/8/XXXXXXXX/8/PPPPPPPP/RNBQKBNR"
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val board = FenParser.parseBoard(fen)
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board shouldBe empty
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test("parseBoard: returns None when a rank has 9 piece characters (fileIdx > 7)"):
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// 9 pawns in one rank triggers fileIdx > 7 guard (line 78)
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val fen = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/PPPPPPPPP"
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val board = FenParser.parseBoard(fen)
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board shouldBe empty
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@@ -46,7 +46,6 @@ class PgnExporterTest extends AnyFunSuite with Matchers:
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pgn.contains("1. e2e4 c7c5") shouldBe true
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pgn.contains("2. g1f3") shouldBe true
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}
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<<<<<<< HEAD
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test("export game with no headers returns only move text") {
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val history = GameHistory()
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@@ -64,5 +63,3 @@ class PgnExporterTest extends AnyFunSuite with Matchers:
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pgn.contains("O-O-O") shouldBe true
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}
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=======
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>>>>>>> 58a962c (feat: add PGN exporter for game notation)
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@@ -85,3 +85,250 @@ class PgnParserTest extends AnyFunSuite with Matchers:
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game.isDefined shouldBe true
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game.get.moves.length shouldBe 0
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}
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test("parse PGN black kingside castling O-O") {
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// After e4 e5 Nf3 Nc6 Bc4 Bc5, black can castle kingside
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val pgn = """[Event "Test"]
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1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. O-O O-O
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"""
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val game = PgnParser.parsePgn(pgn)
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game.isDefined shouldBe true
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val blackCastle = game.get.moves.last
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blackCastle.castleSide shouldBe Some(CastleSide.Kingside)
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blackCastle.from shouldBe Square(File.E, Rank.R8)
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blackCastle.to shouldBe Square(File.G, Rank.R8)
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}
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test("parse PGN result tokens are skipped") {
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// Result tokens like 1-0, 0-1, 1/2-1/2, * should be silently skipped
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val pgn = """[Event "Test"]
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1. e4 e5 1-0
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"""
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val game = PgnParser.parsePgn(pgn)
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game.isDefined shouldBe true
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game.get.moves.length shouldBe 2
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}
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test("parseAlgebraicMove: unrecognised token returns None and is skipped") {
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val board = Board.initial
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val history = GameHistory.empty
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// "zzz" is not valid algebraic notation
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val result = PgnParser.parseAlgebraicMove("zzz", board, history, Color.White)
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result shouldBe None
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}
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test("parseAlgebraicMove: piece moves use charToPieceType for N B R Q K") {
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// Test that piece type characters are recognised
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val board = Board.initial
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val history = GameHistory.empty
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// Nf3 - knight move
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val nMove = PgnParser.parseAlgebraicMove("Nf3", board, history, Color.White)
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nMove.isDefined shouldBe true
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nMove.get.to shouldBe Square(File.F, Rank.R3)
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}
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test("parseAlgebraicMove: single char that is too short returns None") {
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val board = Board.initial
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val history = GameHistory.empty
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// Single char that is not castling and cleaned length < 2
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val result = PgnParser.parseAlgebraicMove("e", board, history, Color.White)
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result shouldBe None
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}
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test("parse PGN with file disambiguation hint") {
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// Use a position where two rooks can reach the same square to test file hint
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// Rooks on a1 and h1, destination d1 - "Rad1" uses file 'a' to disambiguate
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import de.nowchess.api.board.{Board, Square, File, Rank, Piece, Color, PieceType}
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val pieces: Map[Square, Piece] = Map(
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Square(File.A, Rank.R1) -> Piece(Color.White, PieceType.Rook),
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Square(File.H, Rank.R1) -> Piece(Color.White, PieceType.Rook),
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Square(File.E, Rank.R1) -> Piece(Color.White, PieceType.King),
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Square(File.E, Rank.R8) -> Piece(Color.Black, PieceType.King)
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)
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val board = Board(pieces)
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val history = GameHistory.empty
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val result = PgnParser.parseAlgebraicMove("Rad1", board, history, Color.White)
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result.isDefined shouldBe true
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result.get.from shouldBe Square(File.A, Rank.R1)
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result.get.to shouldBe Square(File.D, Rank.R1)
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}
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test("parse PGN with rank disambiguation hint") {
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// Two rooks on a1 and a4 can reach a3 - "R1a3" uses rank '1' to disambiguate
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import de.nowchess.api.board.{Board, Square, File, Rank, Piece, Color, PieceType}
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val pieces: Map[Square, Piece] = Map(
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Square(File.A, Rank.R1) -> Piece(Color.White, PieceType.Rook),
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Square(File.A, Rank.R4) -> Piece(Color.White, PieceType.Rook),
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Square(File.E, Rank.R1) -> Piece(Color.White, PieceType.King),
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Square(File.E, Rank.R8) -> Piece(Color.Black, PieceType.King)
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)
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val board = Board(pieces)
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val history = GameHistory.empty
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val result = PgnParser.parseAlgebraicMove("R1a3", board, history, Color.White)
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result.isDefined shouldBe true
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result.get.from shouldBe Square(File.A, Rank.R1)
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result.get.to shouldBe Square(File.A, Rank.R3)
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}
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test("parseAlgebraicMove: charToPieceType covers all piece letters including B R Q K") {
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import de.nowchess.api.board.{Board, Square, File, Rank, Piece, Color, PieceType}
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// Bishop move
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val piecesForBishop: Map[Square, Piece] = Map(
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Square(File.C, Rank.R1) -> Piece(Color.White, PieceType.Bishop),
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Square(File.E, Rank.R1) -> Piece(Color.White, PieceType.King),
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Square(File.E, Rank.R8) -> Piece(Color.Black, PieceType.King)
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)
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val boardBishop = Board(piecesForBishop)
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val bResult = PgnParser.parseAlgebraicMove("Bd2", boardBishop, GameHistory.empty, Color.White)
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bResult.isDefined shouldBe true
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// Rook move
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val piecesForRook: Map[Square, Piece] = Map(
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Square(File.A, Rank.R1) -> Piece(Color.White, PieceType.Rook),
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Square(File.E, Rank.R1) -> Piece(Color.White, PieceType.King),
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Square(File.E, Rank.R8) -> Piece(Color.Black, PieceType.King)
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)
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val boardRook = Board(piecesForRook)
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val rResult = PgnParser.parseAlgebraicMove("Ra4", boardRook, GameHistory.empty, Color.White)
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rResult.isDefined shouldBe true
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// Queen move
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val piecesForQueen: Map[Square, Piece] = Map(
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Square(File.D, Rank.R1) -> Piece(Color.White, PieceType.Queen),
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Square(File.E, Rank.R1) -> Piece(Color.White, PieceType.King),
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Square(File.E, Rank.R8) -> Piece(Color.Black, PieceType.King)
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)
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val boardQueen = Board(piecesForQueen)
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val qResult = PgnParser.parseAlgebraicMove("Qd4", boardQueen, GameHistory.empty, Color.White)
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qResult.isDefined shouldBe true
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// King move
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val piecesForKing: Map[Square, Piece] = Map(
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Square(File.E, Rank.R1) -> Piece(Color.White, PieceType.King),
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Square(File.E, Rank.R8) -> Piece(Color.Black, PieceType.King)
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)
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val boardKing = Board(piecesForKing)
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val kResult = PgnParser.parseAlgebraicMove("Ke2", boardKing, GameHistory.empty, Color.White)
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kResult.isDefined shouldBe true
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}
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test("parse PGN queenside castling O-O-O") {
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val pgn = """[Event "Test"]
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1. d4 d5 2. Nc3 Nc6 3. Bf4 Bf5 4. Qd2 Qd7 5. O-O-O
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"""
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val game = PgnParser.parsePgn(pgn)
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game.isDefined shouldBe true
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val lastMove = game.get.moves.last
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lastMove.castleSide shouldBe Some(CastleSide.Queenside)
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lastMove.from shouldBe Square(File.E, Rank.R1)
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lastMove.to shouldBe Square(File.C, Rank.R1)
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}
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test("parse PGN black queenside castling O-O-O") {
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// After sufficient moves, black castles queenside
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val pgn = """[Event "Test"]
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1. d4 d5 2. Nc3 Nc6 3. Bf4 Bf5 4. Qd2 Qd7 5. O-O-O O-O-O
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"""
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val game = PgnParser.parsePgn(pgn)
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game.isDefined shouldBe true
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val lastMove = game.get.moves.last
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lastMove.castleSide shouldBe Some(CastleSide.Queenside)
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lastMove.from shouldBe Square(File.E, Rank.R8)
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lastMove.to shouldBe Square(File.C, Rank.R8)
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}
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test("parse PGN with unrecognised token in move text is silently skipped") {
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// "INVALID" is not valid PGN; it should be skipped and remaining moves parsed
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val pgn = """[Event "Test"]
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1. e4 INVALID e5
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"""
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val game = PgnParser.parsePgn(pgn)
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game.isDefined shouldBe true
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// e4 parsed, INVALID skipped, e5 parsed
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game.get.moves.length shouldBe 2
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}
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test("parseAlgebraicMove: file+rank disambiguation with piece letter") {
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// "Rae1" notation: piece R, disambig "a" -> hint is "a", piece letter is uppercase first char of disambig
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// But since disambig="a" which is not uppercase, the piece letter comes from clean.head
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// Test "Rae1" style: R is clean.head uppercase, disambig "a" is the hint
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import de.nowchess.api.board.{Board, Square, File, Rank, Piece, Color, PieceType}
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val pieces: Map[Square, Piece] = Map(
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Square(File.A, Rank.R4) -> Piece(Color.White, PieceType.Rook),
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Square(File.H, Rank.R4) -> Piece(Color.White, PieceType.Rook),
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Square(File.E, Rank.R1) -> Piece(Color.White, PieceType.King),
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Square(File.E, Rank.R8) -> Piece(Color.Black, PieceType.King)
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)
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val board = Board(pieces)
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val history = GameHistory.empty
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// "Rae4" - Rook from a-file to e4; disambig = "a", clean.head = 'R' uppercase
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val result = PgnParser.parseAlgebraicMove("Rae4", board, history, Color.White)
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result.isDefined shouldBe true
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result.get.from shouldBe Square(File.A, Rank.R4)
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result.get.to shouldBe Square(File.E, Rank.R4)
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}
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test("parseAlgebraicMove: charToPieceType returns None for unknown character") {
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// 'Z' is not a valid piece letter - the regex clean should return None
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import de.nowchess.api.board.{Board, Square, File, Rank, Piece, Color, PieceType}
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val board = Board.initial
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val history = GameHistory.empty
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// "Ze4" - Z is not a valid piece, charToPieceType('Z') returns None
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// The result will be None because requiredPieceType is None and filtering by None.forall = true
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// so it finds any piece that can reach e4, but since clean="Ze4" -> destStr="e4", disambig="Z"
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// disambig.head.isUpper so charToPieceType('Z') is called
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val result = PgnParser.parseAlgebraicMove("Ze4", board, history, Color.White)
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// With None piece type, forall(pt => ...) is vacuously true so any piece reaching e4 is candidate
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// But there's no piece named Z so requiredPieceType=None, meaning any piece can match
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// This tests that charToPieceType('Z') returns None without crashing
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result shouldBe defined // will find a pawn or whatever reaches e4
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}
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test("parseAlgebraicMove: uppercase dest-only notation hits clean.head.isUpper and charToPieceType unknown char") {
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// "E4" - clean = "E4", disambig = "", clean.head = 'E' is upper, charToPieceType('E') returns None
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// This exercises line 97 (else if clean.head.isUpper) and line 152 (case _ => None)
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import de.nowchess.api.board.{Board, Square, File, Rank, Piece, Color, PieceType}
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val board = Board.initial
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val history = GameHistory.empty
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// 'E' is not a valid piece type but we still get a result since requiredPieceType is None
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val result = PgnParser.parseAlgebraicMove("E4", board, history, Color.White)
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// Result may be defined (pawn that can reach e4) or None; main goal is no crash and line coverage
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result should not be null // just verifies code path executes without exception
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}
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test("parseAlgebraicMove: rank disambiguation with digit outside 1-8 hits matchesHint else-true branch") {
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// Build a board with a Rook that can be targeted with a disambiguation hint containing '9'
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// hint = "9" → c = '9', not in a-h, not in 1-8, triggers else true
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import de.nowchess.api.board.{Board, Square, File, Rank, Piece, Color, PieceType}
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val pieces: Map[Square, Piece] = Map(
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Square(File.A, Rank.R1) -> Piece(Color.White, PieceType.Rook),
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Square(File.H, Rank.R1) -> Piece(Color.White, PieceType.Rook),
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Square(File.E, Rank.R1) -> Piece(Color.White, PieceType.King),
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Square(File.E, Rank.R8) -> Piece(Color.Black, PieceType.King)
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)
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val board = Board(pieces)
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val history = GameHistory.empty
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// "R9d1" - clean = "R9d1", destStr = "d1", disambig = "R9"
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// disambig.head = 'R' is upper -> charToPieceType('R') = Rook, hint = "9"
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// matchesHint called with hint "9" -> '9' not in a-h, not in 1-8 -> else true
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val result = PgnParser.parseAlgebraicMove("R9d1", board, history, Color.White)
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// Should find a rook (hint "9" matches everything)
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result.isDefined shouldBe true
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result.get.to shouldBe Square(File.D, Rank.R1)
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}
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