diff --git a/lib/assets/assetManager.grouped.test.ts b/lib/assets/assetManager.grouped.test.ts
new file mode 100644
index 0000000..68d04df
--- /dev/null
+++ b/lib/assets/assetManager.grouped.test.ts
@@ -0,0 +1,26 @@
+import { describe, it, expect } from 'vitest'
+import { AssetManager } from '@/lib/assets/assetManager'
+
+function u8(n: number): Uint8Array { const a = new Uint8Array(n); for (let i=0;i<n;i++) a[i]=i&0xff; return a }
+
+describe('AssetManager pathStrategy grouped', () => {
+  it('writes assets under assets/images and assets/fonts when grouped', async () => {
+    const am = new AssetManager({ maxBytes: 1024*1024, allowedExts: ['png','woff2'], pathStrategy: 'grouped' })
+    const img = await am.add({ name: 'hero.png', type: 'image/png', bytes: u8(10) })
+    const font = await am.add({ name: 'main.woff2', type: 'font/woff2', bytes: u8(12) })
+    expect(img.path).toMatch(/^assets\/images\/[0-9a-f]{8}\.png$/)
+    expect(font.path).toMatch(/^assets\/fonts\/[0-9a-f]{8}\.woff2$/)
+    const zip = am.toZipStructure()
+    const keys = Object.keys(zip)
+    expect(keys.some(k => /^assets\/images\//.test(k))).toBe(true)
+    expect(keys.some(k => /^assets\/fonts\//.test(k))).toBe(true)
+  })
+
+  it('rewriteUrl marks referenced originals and returns grouped path', async () => {
+    const am = new AssetManager({ maxBytes: 1024*1024, allowedExts: ['png'], pathStrategy: 'grouped' })
+    const img = await am.add({ name: 'hero.png', type: 'image/png', bytes: u8(10) })
+    const rewritten = am.rewriteUrl('local:hero.png')
+    expect(rewritten).toBe(img.path)
+    expect(am.referencedList()).toContain('hero.png')
+  })
+})