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diff --git a/miniapp/assets/brand/default-avatar.png b/miniapp/assets/brand/default-avatar.png
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diff --git a/miniapp/assets/brand/home-nightscape.jpg b/miniapp/assets/brand/home-nightscape.jpg
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diff --git a/miniapp/assets/covers/activity-default.jpg b/miniapp/assets/covers/activity-default.jpg
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diff --git a/miniapp/assets/covers/classroom-default.jpg b/miniapp/assets/covers/classroom-default.jpg
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diff --git a/ui-tests/brand-assets.mjs b/ui-tests/brand-assets.mjs
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+++ b/ui-tests/brand-assets.mjs
@@ -0,0 +1,25 @@
+import assert from 'node:assert/strict'
+import { existsSync, readFileSync } from 'node:fs'
+import { resolve } from 'node:path'
+
+const root = resolve(import.meta.dirname, '..')
+const assets = [
+  'admin-web/public/brand/logo-mark.png',
+  'admin-web/public/brand/login-illustration.jpg',
+  'miniapp/assets/brand/logo-mark.png',
+  'miniapp/assets/brand/home-nightscape.jpg',
+  'miniapp/assets/brand/default-avatar.png',
+  'miniapp/assets/covers/activity-default.jpg',
+  'miniapp/assets/covers/classroom-default.jpg',
+  'miniapp/assets/covers/counseling-default.jpg',
+  'miniapp/assets/covers/anti-fraud-default.jpg',
+  'miniapp/assets/covers/station-default.jpg',
+]
+
+for (const file of assets) {
+  const path = resolve(root, file)
+  assert.ok(existsSync(path), `缺少品牌资产 ${file}`)
+  assert.ok(readFileSync(path).length > 4096, `品牌资产为空或过小 ${file}`)
+}
+
+console.log('Brand asset contracts passed')