feat: world orchestrator with living NPC economy

2026-06-12 14:22:42 +00:00
parent 29b1aef7d3
commit b2aef9e72c
4 changed files with 148 additions and 0 deletions
@@ -0,0 +1,50 @@
+import { describe, it, expect } from 'vitest';
+import { createWorld, advance } from '../src/sim/world.js';
+
+describe('world', () => {
+  it('creates a populated world with player at a planet', () => {
+    const w = createWorld('alpha', { systemCount: 12, npcCount: 30 });
+    expect(w.npcs).toHaveLength(30);
+    expect(w.galaxy.systems).toHaveLength(12);
+    expect(w.player.loc.kind).toBe('docked');
+    expect(w.player.credits).toBeGreaterThan(0);
+    for (const npc of w.npcs) {
+      expect(npc.alive).toBe(true);
+      expect(w.galaxy.planets[npc.planetId]).toBeTruthy();
+    }
+  });
+
+  it('advance processes events; NPCs actually trade', () => {
+    const w = createWorld('alpha', { systemCount: 12, npcCount: 30 });
+    advance(w, 40);
+    expect(w.t).toBe(40);
+    expect(w.stats.trades).toBeGreaterThan(30); // every npc averages >1 completed trade
+  });
+
+  it('is deterministic end-to-end', () => {
+    const run = () => {
+      const w = createWorld('alpha', { systemCount: 12, npcCount: 30 });
+      advance(w, 40);
+      return w.npcs.map((n) => [n.credits, n.planetId, n.alive]);
+    };
+    expect(JSON.stringify(run())).toBe(JSON.stringify(run()));
+  });
+
+  it('different seeds diverge', () => {
+    const w1 = createWorld('alpha', { systemCount: 12, npcCount: 30 });
+    const w2 = createWorld('beta', { systemCount: 12, npcCount: 30 });
+    advance(w1, 20);
+    advance(w2, 20);
+    expect(JSON.stringify(w1.npcs.map((n) => n.credits)))
+      .not.toBe(JSON.stringify(w2.npcs.map((n) => n.credits)));
+  });
+
+  it('advance is incremental: many small steps equal one big step', () => {
+    const a = createWorld('alpha', { systemCount: 12, npcCount: 30 });
+    const b = createWorld('alpha', { systemCount: 12, npcCount: 30 });
+    advance(a, 20);
+    for (let t = 0.5; t <= 20.0001; t += 0.5) advance(b, t);
+    expect(JSON.stringify(b.npcs.map((n) => [n.credits, n.planetId])))
+      .toBe(JSON.stringify(a.npcs.map((n) => [n.credits, n.planetId])));
+  });
+});