v0.3.1 — multiplayer groundwork: 13 engine tests covering 2-4 player games, a seat parameter on snapshot and actionMenu so a player sees their own railroad rather than seat 0's, and the 22 opponent-directed cards held out of every deck until they are built
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Jesse
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/**
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* The engine with more than one player.
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*
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* Everything else in this suite is solitaire, so the multi-player paths — Superintendent rotation,
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* Subdivisions split by SOME players' Control Points, one player's train blocking another's, and
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* scoring the right seat — have been running unwatched. The engine does play 2-5 players today; this
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* is the net under it before the presentation layer learns about seats.
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*/
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import { describe, it } from 'node:test';
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import assert from 'node:assert/strict';
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import { advance, pump } from '../src/engine/advance.ts';
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import { areaOf } from '../src/engine/apply.ts';
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import { STAGES_PER_SHIFT, crewTrayCount } from '../src/engine/content.ts';
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import { createGame } from '../src/engine/setup.ts';
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import type { GameConfig, GameState, PlayerIndex } from '../src/engine/state.ts';
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import { coordKey, subdivisions } from '../src/engine/state.ts';
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import { developerBot, playGame } from '../src/sim/bot.ts';
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import { snapshot } from '../src/sim/view.ts';
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const competitive: GameConfig = {
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mode: 'competitive',
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victory: 'highestAfterDays',
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length: 'standard',
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optionalRules: { reducedVisibility: false, sisterTrains: false, employeeRotation: false, emergencyToolbox: false },
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};
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const game = (players: number, seed = 4242): GameState =>
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createGame({
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id: `mp${players}`,
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seed,
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config: competitive,
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playerNames: Array.from({ length: players }, (_, i) => `p${i}`),
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});
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/** Puts a made-up train on `owner`'s A/D track, ready to highball in `direction`. */
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function readyToLeave(s: GameState, owner: PlayerIndex, id: string, direction: 'east' | 'west'): void {
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const area = areaOf(s, owner);
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s.trays.set(id, {
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id, trainNumber: 9, trainIsExtra: false, engineAt: 0, consist: [],
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direction, position: { at: 'grid', owner, coord: area.officeCoord }, movesUsed: 0,
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});
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area.adOccupancy.push(id);
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}
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const pinTerrain = (s: GameState): void => {
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// Double Track and Uncontrolled Siding print "trains may pass", which would clear any departure.
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for (const n of s.division.nodes) if (n.kind === 'mainline') n.card = 'plains';
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};
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// ---------------------------------------------------------------------------
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describe('multi-player games run at all', () => {
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it('plays 2, 3 and 4 players to a finish, scoring each seat separately', () => {
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for (const players of [2, 3, 4]) {
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const s = game(players);
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const r = playGame(s, developerBot, pump);
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assert.ok(r.finished, `${players}p did not finish`);
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assert.equal(s.players.length, players);
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// Each seat keeps its own score. A single shared counter would show identical revenue.
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assert.equal(new Set(s.players.map((p) => p.index)).size, players, 'seats are not distinct');
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}
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});
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it('gives every player an Office Area and the right number of Crew Trays', () => {
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for (const players of [2, 3, 4]) {
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const s = game(players);
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assert.equal(s.officeAreas.size, players, `${players}p office areas`);
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for (let p = 0; p < players; p++) {
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assert.equal(areaOf(s, p).owner, p, 'an Office Area is owned by the wrong seat');
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}
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// §7 — trays are scarce on purpose, and the count is per player count.
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assert.equal(s.freeTrays.length, crewTrayCount(players), `${players}p crew trays`);
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}
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});
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});
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describe('the Fedora goes round the table', () => {
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/**
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* Watches the Superintendent while the BOT plays the game.
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*
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* `advance` stops and asks for input rather than driving itself, so calling it in a loop never
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* moves the clock — the game has to actually be played. A spy policy records the seat holding the
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* Fedora each time a decision is asked for.
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*/
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const superintendentsSeen = (players: number): number[] => {
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const s = game(players);
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const seen: number[] = [];
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const spy = {
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name: 'spy',
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choose(st: GameState, p: PlayerIndex, opts: Parameters<typeof developerBot.choose>[2]) {
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const who = st.clock.superintendent;
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if (seen[seen.length - 1] !== who) seen.push(who);
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return developerBot.choose(st, p, opts);
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},
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};
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playGame(s, spy as never, pump);
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return seen;
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};
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it('passes the Superintendent to the next seat, wrapping round the table', () => {
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// §5 — the Fedora passes every three Stages. With one player that is invisible, because the next
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// seat is always the same seat.
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for (const players of [2, 3, 4]) {
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const seen = superintendentsSeen(players);
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assert.ok(seen.length > players, `${players}p: the Fedora moved only ${seen.length - 1} times`);
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for (let i = 1; i < seen.length; i++) {
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assert.equal(
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seen[i], (seen[i - 1]! + 1) % players,
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`${players}p: the Fedora jumped from ${seen[i - 1]} to ${seen[i]}`,
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);
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}
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}
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});
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it('gives every seat the Fedora over a full game', () => {
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// Four Days of twelve Stages is sixteen shift changes, so nobody should be missed.
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for (const players of [2, 3, 4]) {
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const seen = new Set(superintendentsSeen(players));
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assert.equal(seen.size, players, `${players}p: only ${seen.size} seats ever held the Fedora`);
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}
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});
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it('changes shift on the Stage the rule names, not on some other count', () => {
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// The hand-over happens entering a Stage that is a multiple of three (§5).
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const s = game(3);
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const stages: number[] = [];
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let last = s.clock.superintendent;
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const spy = {
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name: 'spy',
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choose(st: GameState, p: PlayerIndex, opts: Parameters<typeof developerBot.choose>[2]) {
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if (st.clock.superintendent !== last) {
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stages.push(st.clock.stage);
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last = st.clock.superintendent;
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}
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return developerBot.choose(st, p, opts);
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},
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};
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playGame(s, spy as never, pump);
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assert.ok(stages.length > 0, 'the Superintendent never changed');
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for (const stage of stages) {
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assert.equal(
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(stage - 1) % STAGES_PER_SHIFT, 0,
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`the shift changed inside Stage ${stage}, which is not a shift boundary`,
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);
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}
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});
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});
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describe('Subdivisions are split by whoever is a Control Point', () => {
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it('splits only at the Offices that have upgraded', () => {
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// With four players the Division is DP · ML · O0 · ML · O1 · ML · O2 · ML · O3 · ML · DP. Every
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// Office starts a Whistle Post, so the whole railroad is ONE Subdivision; upgrading ONE office in
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// the middle should cut it in two and leave the others inside.
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const s = game(4);
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assert.equal(subdivisions(s).length, 1, 'four Whistle Posts should leave one Subdivision');
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areaOf(s, 1).tier = 'depot';
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const split = subdivisions(s);
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assert.equal(split.length, 2, 'a Control Point should cut the Division in two');
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// The upgraded Office is a BOUNDARY, so it appears in neither group; the others still sit inside.
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const officeIndex = (owner: number): number =>
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s.division.nodes.findIndex((n) => n.kind === 'office' && n.owner === owner);
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const all = split.flat();
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assert.ok(!all.includes(officeIndex(1)), 'the Control Point is still inside a Subdivision');
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for (const other of [0, 2, 3]) {
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assert.ok(all.includes(officeIndex(other)), `a Whistle Post at seat ${other} became a boundary`);
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}
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});
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it('gives every Office its own Subdivision once they are all Control Points', () => {
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const s = game(4);
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for (let p = 0; p < 4; p++) areaOf(s, p).tier = 'terminal';
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// Five Mainline cards, each now bounded by a Control Point or a Division Point.
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assert.equal(subdivisions(s).length, 5, 'each Mainline card should be its own Subdivision');
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});
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});
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describe("one player's train blocks another's", () => {
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it('bars a departure into a Subdivision an opposing train occupies, whoever owns it', () => {
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// §8.1's absolute bar is about the SUBDIVISION, not about whose train it is. With two Whistle
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// Posts the whole railroad is one Subdivision, so seat 0 cannot leave into seat 1's oncoming
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// train even though they are nowhere near each other.
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const s = game(2);
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pinTerrain(s);
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assert.equal(subdivisions(s).length, 1, 'the fixture assumes one Subdivision');
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// Seat 1's train is running WEST somewhere on the Division.
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const far = s.division.nodes.findIndex((n, i) => n.kind === 'mainline' && i > 2);
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const node = s.division.nodes[far];
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if (node?.kind === 'mainline') {
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node.transits.push({ tray: 'theirs', stagesRemaining: 2, stagesTotal: 2, direction: 'west' });
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}
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s.trays.set('theirs', {
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id: 'theirs', trainNumber: 3, trainIsExtra: false, engineAt: 0, consist: [],
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direction: 'west', position: { at: 'mainline', index: far }, movesUsed: 0,
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});
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readyToLeave(s, 0, 'mine', 'east');
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s.clock.phase = 'mainline';
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s.movedThisPhase = new Set();
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advance(s);
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assert.equal(
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s.trays.get('mine')!.position.at, 'grid',
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"a train departed into a Subdivision holding another player's oncoming train",
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);
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});
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it('lets it go once a Control Point puts them in different Subdivisions', () => {
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// The same position, with the middle Office upgraded: the two trains are no longer in the same
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// Subdivision, so seat 0's departure is nobody's business but its own.
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const s = game(2);
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pinTerrain(s);
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areaOf(s, 0).tier = 'depot';
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const far = s.division.nodes.findIndex((n, i) => n.kind === 'mainline' && i > 2);
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const node = s.division.nodes[far];
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if (node?.kind === 'mainline') {
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node.transits.push({ tray: 'theirs', stagesRemaining: 2, stagesTotal: 2, direction: 'west' });
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}
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s.trays.set('theirs', {
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id: 'theirs', trainNumber: 3, trainIsExtra: false, engineAt: 0, consist: [],
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direction: 'west', position: { at: 'mainline', index: far }, movesUsed: 0,
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});
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readyToLeave(s, 0, 'mine', 'west');
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s.clock.phase = 'mainline';
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s.movedThisPhase = new Set();
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advance(s);
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assert.equal(
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s.trays.get('mine')!.position.at, 'mainline',
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'a train was held for a train in a different Subdivision',
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);
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});
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});
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describe('the view shows one seat at a time', () => {
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it('gives each seat its own board and its own hand', () => {
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/**
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* `snapshot` was hardcoded to seat 0. That is correct with one player and would have shown every
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* player player 0's railroad — including player 0's HAND, which the state model calls secret.
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* This is the test that the parameter is real rather than decorative.
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*/
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const s = game(3);
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// Captured BEFORE the loop: seat 0's hand is about to be rewritten, and reading it afterwards
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// would hand every seat the same truncated list.
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const source = [...(s.decks.hands.get(0) ?? [])];
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assert.ok(source.length >= 3, 'the opening deal should be six cards');
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// Make the three districts visibly different, and give each seat a different hand.
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for (let p = 0; p < 3; p++) {
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const area = areaOf(s, p);
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for (let n = 0; n < p; n++) {
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area.grid.set(coordKey({ row: area.runningRow - 1, col: n }), {
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geometry: { kind: 'track', geometry: 'straight' },
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baseOperationalRail: true, standing: [], facility: null, modifiers: [], enhancements: [],
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});
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}
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s.decks.hands.set(p, source.slice(0, p + 1));
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}
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const frames = [0, 1, 2].map((p) => snapshot(s, [], null, null, null, false, p));
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// Each seat sees its OWN district: seat 0 has none of the extra track, seat 2 has two pieces.
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const sizes = frames.map((f) => f.cells.length);
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assert.ok(sizes[0]! < sizes[1]! && sizes[1]! < sizes[2]!, `districts are not distinct: ${sizes.join(', ')}`);
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// And its own hand.
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assert.deepEqual(frames.map((f) => f.hand.length), [1, 2, 3], 'seats do not have distinct hands');
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});
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it('defaults to seat 0, so solitaire and every replay are unaffected', () => {
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const s = game(2);
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assert.deepEqual(
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snapshot(s, [], null).hand,
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snapshot(s, [], null, null, null, false, 0).hand,
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'the default viewer is not seat 0',
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);
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});
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});
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describe('scoring lands on the right seat', () => {
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it('pays the departure Revenue to the Office the train left, not to seat 0', () => {
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/**
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* The rule reads "one Revenue for every train that clears YOUR section", and `awardDeparture`
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* takes the owner of the departing Office. With one player that is unfalsifiable: seat 0 is the
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* only seat there is. This is the test that says so with three.
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*/
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const s = game(3);
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pinTerrain(s);
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const before = s.players.map((p) => p.revenue);
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readyToLeave(s, 2, 'theirs', 'east');
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s.clock.phase = 'mainline';
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s.movedThisPhase = new Set();
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advance(s);
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assert.equal(s.players[2]!.revenue, before[2]! + 1, 'seat 2 was not paid for its own departure');
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assert.equal(s.players[0]!.revenue, before[0]!, 'seat 0 was paid for a train it never ran');
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assert.equal(s.players[1]!.revenue, before[1]!, 'seat 1 was paid for a train it never ran');
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});
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it('keeps each seat’s Office Area to itself', () => {
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// A card laid in one player's district must not appear in another's — the areas are separate maps
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// and it would be easy for a shared reference to make every district the same district.
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const s = game(3);
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const mine = areaOf(s, 1);
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const sizeBefore = s.officeAreas.get(2)!.grid.size;
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mine.grid.set(coordKey({ row: mine.runningRow - 1, col: 0 }), {
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geometry: { kind: 'track', geometry: 'straight' },
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baseOperationalRail: true, standing: [], facility: null, modifiers: [], enhancements: [],
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});
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assert.equal(s.officeAreas.get(2)!.grid.size, sizeBefore, "one player's track appeared in another's district");
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assert.notEqual(areaOf(s, 1), areaOf(s, 2), 'two seats share one Office Area object');
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});
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});
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