41 lines
1.6 KiB
JavaScript
41 lines
1.6 KiB
JavaScript
import { describe, it, expect } from 'vitest';
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import { NewsLedger } from '../src/sim/news.js';
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import { generateGalaxy } from '../src/sim/galaxy.js';
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import { priceOf } from '../src/sim/economy.js';
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describe('NewsLedger', () => {
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it('records snapshots and serves them with lane delay', () => {
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const galaxy = generateGalaxy('news-test', { systemCount: 8 });
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const news = new NewsLedger();
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news.record(galaxy, 0);
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news.record(galaxy, 1);
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news.record(galaxy, 2);
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const pid = galaxy.planets[0].id;
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// 0 hops away at t=2: freshest snapshot (t=2)
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expect(news.knownPrices(pid, 0, 2).time).toBe(2);
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// 2 hops away at t=2: only the t=0 snapshot has reached us
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expect(news.knownPrices(pid, 2, 2).time).toBe(0);
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// far away early on: clamps to the universally-known t=0 snapshot
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expect(news.knownPrices(pid, 5, 1).time).toBe(0);
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});
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it('snapshot prices match the live price curve at record time', () => {
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const galaxy = generateGalaxy('news-test', { systemCount: 8 });
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const news = new NewsLedger();
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news.record(galaxy, 0);
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const p = galaxy.planets[0];
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const snap = news.knownPrices(p.id, 0, 0);
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expect(snap.prices.ore).toBeCloseTo(priceOf('ore', p.stock.ore), 5);
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});
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it('trims history beyond SNAPSHOT_KEEP entries', () => {
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const galaxy = generateGalaxy('news-test', { systemCount: 8 });
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const news = new NewsLedger();
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for (let t = 0; t <= 50; t++) news.record(galaxy, t);
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// a 45-day-old snapshot is gone; we get the oldest retained one instead
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const snap = news.knownPrices(galaxy.planets[0].id, 45, 50);
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expect(snap.time).toBeGreaterThanOrEqual(50 - 30);
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});
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});
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