57 lines
2.1 KiB
TypeScript
57 lines
2.1 KiB
TypeScript
import { describe, it, expect } from 'vitest'
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import { GameEngine } from '../src/server/engine/engine.ts'
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describe('Issue #521: Gold Conservation Invariant & Single Source of Truth', () => {
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it('maintains strict gold conservation across drop and pickup without duplication', () => {
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const engine = new GameEngine('sor')
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engine.bag.gold = 5000
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// Drop 2000 gold (server-authoritative `dropPlayerGold`)
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const pile = engine.dropPlayerGold(2000)
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expect(pile?.goldAmount).toBe(2000)
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expect(engine.bag.gold).toBe(3000)
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const goldPiles = engine.groundItems.all.filter(g => g.isGold)
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expect(goldPiles.length).toBe(1)
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expect(goldPiles[0]!.goldAmount).toBe(2000)
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// Total gold in system (player + ground) is conserved at 5000
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expect(engine.bag.gold + (goldPiles[0]!.goldAmount ?? 0)).toBe(5000)
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// Pick up gold pile
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const picked = engine.pickupGroundGoldPile(goldPiles[0]!.id)
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expect(picked).toBe(2000)
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expect(engine.bag.gold).toBe(5000)
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expect(engine.groundItems.all.filter(g => g.isGold).length).toBe(0)
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})
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it('clamps gold pickup to playerLevel * 10,000 capacity and leaves remainder on ground', () => {
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const engine = new GameEngine('pal')
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// Level 1 capacity = 10,000
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expect(engine.maxGoldCapacity).toBe(10_000)
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engine.bag.gold = 8500
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const pile = engine.groundItems.spawnGold(engine.world.player.x, engine.world.player.y, 4000, 0)
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const picked = engine.pickupGroundGoldPile(pile.id)
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expect(picked).toBe(1500)
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expect(engine.bag.gold).toBe(10_000)
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const remainingPile = engine.groundItems.get(pile.id)
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expect(remainingPile).toBeDefined()
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expect(remainingPile!.goldAmount).toBe(2500)
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})
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it('rejects negative, zero, or NaN gold drops without mutating state', () => {
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const engine = new GameEngine('ama')
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engine.bag.gold = 1200
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expect(engine.dropPlayerGold(0)).toBeNull()
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expect(engine.dropPlayerGold(-500)).toBeNull()
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expect(engine.dropPlayerGold(Number.NaN)).toBeNull()
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expect(engine.bag.gold).toBe(1200)
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expect(engine.groundItems.count).toBe(0)
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})
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})
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