rust_fish_chess_engine 0.1.4

A chess engine and functionality built in Rust. Built for the intention of incorporating it into my Svelte chess project through WASM.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136


#[cfg(test)]
mod tests {
    use rust_fish_chess_engine::{chess_functionality::moves::{calculate_possible_moves, king::CastleState}, Piece, PieceType};

    #[test]
    fn queen_moves_freely() {
        let mut board = vec![vec![None; 8]; 8];
        board[4][4] = Some(Piece::White(PieceType::Queen));

        let expected_moves = vec![
            // Rook-like moves (horizontal & vertical)
            (4, 0), (4, 1), (4, 2), (4, 3), (4, 5), (4, 6), (4, 7),
            (0, 4), (1, 4), (2, 4), (3, 4), (5, 4), (6, 4), (7, 4),
            // Bishop-like moves (diagonal)
            (5, 5), (6, 6), (7, 7), (3, 3), (2, 2), (1, 1), (0, 0),
            (3, 5), (2, 6), (1, 7), (5, 3), (6, 2), (7, 1)
        ];

        let possible_moves = calculate_possible_moves(4, 4, &mut board, false, true, &None, &mut CastleState::new(), false).unwrap();
        assert_eq!(possible_moves.len(), expected_moves.len(), "Expected and actual moves differ in count");
        for m in possible_moves {
            assert!(expected_moves.contains(&m.new_pos), "Unexpected move: {:?}", m.new_pos);
        }
    }

    #[test]
    fn queen_moves_blocked_by_same_color() {
        let mut board = vec![vec![None; 8]; 8];
        board[4][4] = Some(Piece::White(PieceType::Queen));
        board[4][6] = Some(Piece::White(PieceType::Pawn)); // Blocks right movement
        board[6][4] = Some(Piece::White(PieceType::Pawn)); // Blocks downward movement
        board[6][6] = Some(Piece::White(PieceType::Pawn)); // Blocks diagonal movement

        let expected_moves = vec![
            // Rook-like moves (horizontal & vertical, stopping before blockers)
            (4, 5), (4, 3), (4, 2), (4, 1), (4, 0),
            (3, 4), (2, 4), (1, 4), (0, 4), (5, 4),
            // Bishop-like moves (diagonal, stopping before blockers)
            (5, 5), (3, 3), (2, 2), (1, 1), (0, 0), (3, 5), (2, 6), (1, 7), (5, 3), (6, 2), (7, 1)
        ];

        let possible_moves = calculate_possible_moves(4, 4, &mut board, false, true, &None, &mut CastleState::new(), false).unwrap();
        assert_eq!(possible_moves.len(), expected_moves.len(), "Expected and actual moves differ in count");
        for m in possible_moves {
            assert!(expected_moves.contains(&m.new_pos), "Unexpected move: {:?}", m.new_pos);
        }
    }

    #[test]
    fn queen_moves_blocked_by_same_color_alt_color() {
        let mut board = vec![vec![None; 8]; 8];
        board[4][4] = Some(Piece::Black(PieceType::Queen));
        board[4][6] = Some(Piece::Black(PieceType::Pawn)); // Blocks right movement
        board[6][4] = Some(Piece::Black(PieceType::Pawn)); // Blocks downward movement
        board[6][6] = Some(Piece::Black(PieceType::Pawn)); // Blocks diagonal movement

        let expected_moves = vec![
            // Rook-like moves (horizontal & vertical, stopping before blockers)
            (4, 5), (4, 3), (4, 2), (4, 1), (4, 0),
            (3, 4), (2, 4), (1, 4), (0, 4), (5, 4),
            // Bishop-like moves (diagonal, stopping before blockers)
            (5, 5), (3, 3), (2, 2), (1, 1), (0, 0), (3, 5), (2, 6), (1, 7), (5, 3), (6, 2), (7, 1)
        ];

        let possible_moves = calculate_possible_moves(4, 4, &mut board, false, false, &None, &mut CastleState::new(), false).unwrap();
        assert_eq!(possible_moves.len(), expected_moves.len(), "Expected and actual moves differ in count");
        for m in possible_moves {
            assert!(expected_moves.contains(&m.new_pos), "Unexpected move: {:?}", m.new_pos);
        }
    }

    #[test]
    fn queen_can_capture_opponent_piece() {
        let mut board = vec![vec![None; 8]; 8];
        board[4][4] = Some(Piece::White(PieceType::Queen));
        board[6][6] = Some(Piece::Black(PieceType::Pawn)); // Capturable piece

        let expected_moves = vec![
            // Rook-like moves
            (4, 0), (4, 1), (4, 2), (4, 3), (4, 5), (4, 6), (4, 7),
            (0, 4), (1, 4), (2, 4), (3, 4), (5, 4), (6, 4), (7, 4),
            // Bishop-like moves (including capture at 6,6)
            (5, 5), (6, 6), (3, 3), (2, 2), (1, 1), (0, 0),
            (3, 5), (2, 6), (1, 7), (5, 3), (6, 2), (7, 1)
        ];

        let possible_moves = calculate_possible_moves(4, 4, &mut board, false, true, &None, &mut CastleState::new(), false).unwrap();
        assert_eq!(possible_moves.len(), expected_moves.len(), "Expected and actual moves differ in count");
        for m in possible_moves {
            assert!(expected_moves.contains(&m.new_pos), "Unexpected move: {:?}", m.new_pos);
        }
    }

    #[test]
    fn queen_can_capture_opponent_piece_alt_color() {
        let mut board = vec![vec![None; 8]; 8];
        board[4][4] = Some(Piece::Black(PieceType::Queen));
        board[6][6] = Some(Piece::White(PieceType::Pawn)); // Capturable piece

        let expected_moves = vec![
            // Rook-like moves
            (4, 0), (4, 1), (4, 2), (4, 3), (4, 5), (4, 6), (4, 7),
            (0, 4), (1, 4), (2, 4), (3, 4), (5, 4), (6, 4), (7, 4),
            // Bishop-like moves (including capture at 6,6)
            (5, 5), (6, 6), (3, 3), (2, 2), (1, 1), (0, 0),
            (3, 5), (2, 6), (1, 7), (5, 3), (6, 2), (7, 1)
        ];

        let possible_moves = calculate_possible_moves(4, 4, &mut board, false, false, &None, &mut CastleState::new(), false).unwrap();
        assert_eq!(possible_moves.len(), expected_moves.len(), "Expected and actual moves differ in count");
        for m in possible_moves {
            assert!(expected_moves.contains(&m.new_pos), "Unexpected move: {:?}", m.new_pos);
        }
    }

    #[test]
    fn queen_near_board_edge() {
        let mut board = vec![vec![None; 8]; 8];
        board[0][0] = Some(Piece::White(PieceType::Queen));

        let expected_moves = vec![
            // Rook-like moves
            (0, 1), (0, 2), (0, 3), (0, 4), (0, 5), (0, 6), (0, 7),
            (1, 0), (2, 0), (3, 0), (4, 0), (5, 0), (6, 0), (7, 0),
            // Bishop-like moves
            (1, 1), (2, 2), (3, 3), (4, 4), (5, 5), (6, 6), (7, 7)
        ];

        let possible_moves = calculate_possible_moves(0, 0, &mut board, false, true, &None, &mut CastleState::new(), false).unwrap();
        assert_eq!(possible_moves.len(), expected_moves.len(), "Expected and actual moves differ in count");
        for m in possible_moves {
            assert!(expected_moves.contains(&m.new_pos), "Unexpected move: {:?}", m.new_pos);
        }
    }
}