Option2 무결성 강화: integrity index 추가, 인덱스 정렬/교차 검증, referencedAt 매트릭스, README 문서화 (TDD)

lib/exporter/assets.referenced.matrix.test.ts

@@ -0,0 +1,41 @@
+import { describe, it, expect } from 'vitest'
+import { AssetManager } from '@/lib/assets/assetManager'
+import { buildAssetsMetadata, type AssetMetaItem } from '@/lib/exporter/assets.meta'
+
+function u8(n: number): Uint8Array { const a = new Uint8Array(n); for (let i=0;i<n;i++) a[i]=i&0xff; return a }
+
+describe('referencedAt matrix across modes and multiple assets', () => {
+  it.each([
+    { mode: 'flat' as const },
+    { mode: 'grouped' as const },
+  ])('tracks only referenced originals once per asset ($mode)', async ({ mode }) => {
+    const am = new AssetManager({ maxBytes: 1024*1024, allowedExts: ['png','woff2'], pathStrategy: mode })
+    await am.add({ name: 'hero.png', type: 'image/png', bytes: u8(10) })
+    await am.add({ name: 'logo.png', type: 'image/png', bytes: u8(12) })
+    await am.add({ name: 'main.woff2', type: 'font/woff2', bytes: u8(14) })
+
+    // reference some assets multiple times; leave logo.png unreferenced
+    am.rewriteUrl('local:hero.png')
+    am.rewriteUrl('local:hero.png')
+    am.rewriteUrl('local:main.woff2')
+
+    const metaBytes = buildAssetsMetadata(am)
+    const obj = JSON.parse(new TextDecoder().decode(metaBytes)) as { assets: AssetMetaItem[] }
+    const byName = new Map(obj.assets.map(a => [a.originalName, a]))
+
+    const hero = byName.get('hero.png')!
+    const logo = byName.get('logo.png')!
+    const font = byName.get('main.woff2')!
+
+    expect(Array.isArray(hero.referencedAt)).toBe(true)
+    expect(hero.referencedAt).toContain('local:hero.png')
+    expect(hero.referencedAt.length).toBe(1)
+
+    expect(Array.isArray(font.referencedAt)).toBe(true)
+    expect(font.referencedAt).toContain('local:main.woff2')
+    expect(font.referencedAt.length).toBe(1)
+
+    expect(Array.isArray(logo.referencedAt)).toBe(true)
+    expect(logo.referencedAt.length).toBe(0)
+  })
+})