51 lines
1.9 KiB
JavaScript
51 lines
1.9 KiB
JavaScript
import { describe, it, expect } from 'vitest';
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import { createWorld, advance } from '../src/sim/world.js';
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describe('world', () => {
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it('creates a populated world with player at a planet', () => {
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const w = createWorld('alpha', { systemCount: 12, npcCount: 30 });
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expect(w.npcs).toHaveLength(30);
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expect(w.galaxy.systems).toHaveLength(12);
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expect(w.player.loc.kind).toBe('docked');
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expect(w.player.credits).toBeGreaterThan(0);
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for (const npc of w.npcs) {
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expect(npc.alive).toBe(true);
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expect(w.galaxy.planets[npc.planetId]).toBeTruthy();
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}
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});
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it('advance processes events; NPCs actually trade', () => {
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const w = createWorld('alpha', { systemCount: 12, npcCount: 30 });
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advance(w, 40);
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expect(w.t).toBe(40);
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expect(w.stats.trades).toBeGreaterThan(30); // every npc averages >1 completed trade
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});
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it('is deterministic end-to-end', () => {
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const run = () => {
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const w = createWorld('alpha', { systemCount: 12, npcCount: 30 });
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advance(w, 40);
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return w.npcs.map((n) => [n.credits, n.planetId, n.alive]);
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};
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expect(JSON.stringify(run())).toBe(JSON.stringify(run()));
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});
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it('different seeds diverge', () => {
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const w1 = createWorld('alpha', { systemCount: 12, npcCount: 30 });
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const w2 = createWorld('beta', { systemCount: 12, npcCount: 30 });
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advance(w1, 20);
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advance(w2, 20);
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expect(JSON.stringify(w1.npcs.map((n) => n.credits)))
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.not.toBe(JSON.stringify(w2.npcs.map((n) => n.credits)));
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});
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it('advance is incremental: many small steps equal one big step', () => {
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const a = createWorld('alpha', { systemCount: 12, npcCount: 30 });
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const b = createWorld('alpha', { systemCount: 12, npcCount: 30 });
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advance(a, 20);
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for (let t = 0.5; t <= 20.0001; t += 0.5) advance(b, t);
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expect(JSON.stringify(b.npcs.map((n) => [n.credits, n.planetId])))
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.toBe(JSON.stringify(a.npcs.map((n) => [n.credits, n.planetId])));
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});
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});
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