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scrabble-game/ui/src/lib/localgame/ruleset.parity.test.ts
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Ilia Denisov e4cf143e9f
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feat(offline): local game engine (Phase B1)
The offline vs_ai game engine — a faithful TS port of backend/internal/engine that
drives a whole local game with no backend. Composes with the move generator (#188) and
robot strategy (#189) from Phase A; not yet wired into the UI (Phase B2/B3).

- ui/src/lib/localgame/ruleset.ts: static per-variant tile values / bag counts / blank
  count, mirrored from rules.go (offline scoring is self-contained; online uses the
  server alphabet). Pinned by ruleset.parity.test.ts against a Go fixture.
- bag.ts: the tile bag (fill from counts/blanks, draw-from-end, return+reshuffle) on a
  deterministic in-house PRNG — a game replays from its seed, not bit-identical to a
  server game (per plan).
- board.ts: the mutable board, satisfying the validator/generator read view + set().
- engine.ts: LocalGame — deal / play (reusing validate.ts) / pass / exchange / resign,
  scoreless(6) & out-of-tiles end detection, end-of-game rack penalties, winner; mirrors
  game.go. The end-game math is exported as pure functions, pinned against the Go engine
  (engine.parity.test.ts, 9 constructed positions).
- engine.test.ts: a full-loop smoke — two robots play a whole vs_ai game to completion
  via generateMoves + decide, and it is reproducible from the seed.
- backend: movegen now dumps the per-variant rulesets; a new in-package engine emitter
  (endfixture_test.go, env-gated) produces the end-game golden.

Pure additive library code; no runtime behavior change (unused at runtime, bundle unchanged).
2026-07-06 08:02:05 +02:00

38 lines
1.2 KiB
TypeScript

import { describe, it, expect } from 'vitest';
import { readFileSync } from 'node:fs';
import { RULESETS } from './ruleset';
import type { Variant } from '../model';
// The offline engine is self-contained: it carries each variant's tile values, bag counts and
// blank count in ruleset.ts (these are not otherwise on the client — online scoring uses the
// server-sent alphabet). This pins that hand-copied table to the Go rulesets
// (scrabble-solver/rules), whose values the movegen tool dumps to testdata/rulesets.json.
interface RulesetFix {
size: number;
rackSize: number;
bingo: number;
blanks: number;
values: number[];
counts: number[];
}
const fx = JSON.parse(
readFileSync(new URL('./testdata/rulesets.json', import.meta.url), 'utf8'),
) as Record<Variant, RulesetFix>;
describe('offline ruleset table parity vs Go rules', () => {
for (const variant of Object.keys(fx) as Variant[]) {
it(variant, () => {
const rs = RULESETS[variant];
expect({
size: rs.size,
rackSize: rs.rackSize,
bingo: rs.bingo,
blanks: rs.blanks,
values: [...rs.values],
counts: [...rs.counts],
}).toEqual(fx[variant]);
});
}
});