claude (blind_chess)
101 lines
4.1 KiB
TypeScript
101 lines
4.1 KiB
TypeScript
import { describe, it, expect } from 'vitest';
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import { Chess } from 'chess.js';
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import { legalCandidates } from '../../../src/bot/candidates.js';
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import type { Game } from '../../../src/state.js';
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import { RATE_LIMIT } from '../../../src/state.js';
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function makeGame(mode: 'blind' | 'vanilla', fen?: string): Game {
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return {
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id: 'cand0001',
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mode,
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highlightingEnabled: false,
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status: 'active',
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createdAt: Date.now(),
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chess: fen ? new Chess(fen) : new Chess(),
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moveHistory: [],
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announcements: [],
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players: {
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w: { token: 'w'.repeat(24), socket: null, joinedAt: 0,
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rateBucket: { tokens: RATE_LIMIT.capacity, last: 0 } },
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b: { token: 'b'.repeat(24), socket: null, joinedAt: 0,
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rateBucket: { tokens: RATE_LIMIT.capacity, last: 0 } },
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},
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armed: null,
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drawOffer: null,
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disconnectAt: {},
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};
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}
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describe('legalCandidates / vanilla', () => {
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it('starting position: 20 candidates for white', () => {
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const game = makeGame('vanilla');
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const candidates = legalCandidates(game, 'w');
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expect(candidates.length).toBe(20);
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});
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it('returns from/to on each candidate', () => {
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const game = makeGame('vanilla');
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const candidates = legalCandidates(game, 'w');
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expect(candidates.every((c) => c.from && c.to)).toBe(true);
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});
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it('vanilla excludes pinned-piece moves (chess.js filters self-check)', () => {
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// White king e1, white bishop e2, black rook e8. Bishop is pinned.
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const game = makeGame('vanilla', '4r2k/8/8/8/8/8/4B3/4K3 w - - 0 1');
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const candidates = legalCandidates(game, 'w');
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// Bishop on e2 has zero legal moves (any move drops the king to check).
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expect(candidates.find((c) => c.from === 'e2')).toBeUndefined();
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});
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it('vanilla expands all 4 promotion options', () => {
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// White pawn on a7, ready to promote.
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const game = makeGame('vanilla', '4k3/P7/8/8/8/8/8/4K3 w - - 0 1');
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const candidates = legalCandidates(game, 'w').filter((c) => c.from === 'a7');
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expect(candidates.map((c) => c.promotion).sort()).toEqual(['b', 'n', 'q', 'r']);
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});
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});
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describe('legalCandidates / blind', () => {
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it('starting position: 34 geometric candidates for white', () => {
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// 8 pawns: edge pawns (a2, h2) return 3 moves each (forward 1, forward 2, 1 diagonal),
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// interior pawns (b2-g2) return 4 moves each (forward 1, forward 2, 2 diagonals).
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// Total pawn: 2*3 + 6*4 = 30.
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// 2 knights: 2 moves each = 4.
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// Total: 34.
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const game = makeGame('blind');
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const candidates = legalCandidates(game, 'w');
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expect(candidates.length).toBe(34);
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});
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it('blind INCLUDES pinned-piece moves (geometric does not know about pins)', () => {
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// Same pinned-bishop position. Geometric move-gen sees no own piece blocking;
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// bishop can geometrically reach d3, c4, b5, a6, f3, etc.
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const game = makeGame('blind', '4r2k/8/8/8/8/8/4B3/4K3 w - - 0 1');
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const candidates = legalCandidates(game, 'w');
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expect(candidates.some((c) => c.from === 'e2')).toBe(true);
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});
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it('blind expands all 4 promotion options for own pawn', () => {
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const game = makeGame('blind', '4k3/P7/8/8/8/8/8/4K3 w - - 0 1');
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const candidates = legalCandidates(game, 'w').filter((c) => c.from === 'a7' && c.to === 'a8');
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expect(candidates.map((c) => c.promotion).sort()).toEqual(['b', 'n', 'q', 'r']);
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});
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it('blind ignores whose turn it is (returns moves for either color)', () => {
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// Vanilla path filters by chess.js .moves() which respects toMove. Blind
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// path iterates own pieces directly, so black candidates exist on move 0.
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const game = makeGame('blind');
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const candidates = legalCandidates(game, 'b');
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// Same geometric move count as white: 34.
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expect(candidates.length).toBe(34);
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});
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it('zero own pieces = zero candidates (degenerate)', () => {
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// FEN with only black king + pieces — but FEN must be valid, kings required.
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const game = makeGame('blind', '4k3/8/8/8/8/8/8/4K3 w - - 0 1');
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const black = legalCandidates(game, 'b');
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// Black king on e8 has 5 geometric king moves (d8, f8, d7, e7, f7).
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expect(black.length).toBe(5);
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});
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});
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