A room whose ledger cannot be read is logged and left unloaded, not the server down; the server has tests of its own

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jm2auWk6RP71CjaAb4FMoG

template/server/src/rooms.test.ts

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+import { appendFileSync, mkdtempSync, rmSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { game, type Input, type State } from '../../src/lib/game';
+import type { GameSpec } from '../../src/lib/game/spec';
+import { Rooms } from './rooms';
+import { Store } from './store';
+
+let dir: string;
+beforeEach(() => {
+	dir = mkdtempSync(join(tmpdir(), 'rooms-'));
+});
+afterEach(() => {
+	rmSync(dir, { recursive: true, force: true });
+});
+
+/** A table of the demo game: the host and a second person, the game begun. */
+function table(spec: GameSpec<State, Input> = game) {
+	const rooms = new Rooms(spec, new Store(dir));
+	const host = rooms.create('Ann', 2);
+	const guest = rooms.join(host.room, 'Bo');
+	rooms.begin(host.room, host.token);
+	return { rooms, room: host.room, ann: host.token, bo: guest.token };
+}
+
+describe('rooms', () => {
+	it('resolves a round once every seat has moved, and refuses a move for a round already played', () => {
+		const { rooms, room, ann, bo } = table();
+		rooms.submit(room, ann, { pick: 5 }, 0);
+		expect(rooms.waitingOn(room)).toEqual(['B']);
+		rooms.submit(room, bo, { pick: 2 }, 0);
+		expect(room.resolved).toBe(1);
+		expect(() => rooms.submit(room, ann, { pick: 4 }, 0)).toThrow(/already been played/);
+	});
+
+	it('leaves a room with an unreadable ledger unloaded and opens the rest', () => {
+		const { room } = table();
+		appendFileSync(join(dir, 'ZZZZ.jsonl'), '{"t":"room","id":"ZZZZ","seats":2,"createdAt":1,"options":{}}\n{"t":"seat", torn');
+		const errors = vi.spyOn(console, 'error').mockImplementation(() => {});
+		const reopened = new Rooms(game, new Store(dir));
+		expect(errors).toHaveBeenCalledWith(expect.stringMatching(/ZZZZ: ledger unreadable/));
+		expect(reopened.get(room.id).state).not.toBeNull();
+		errors.mockRestore();
+	});
+});