diff --git a/frontend/src/__tests__/setup.ts b/frontend/src/__tests__/setup.ts
index decb2a37..b777b22e 100644
--- a/frontend/src/__tests__/setup.ts
+++ b/frontend/src/__tests__/setup.ts
@@ -5,6 +5,45 @@
 import { config } from '@vue/test-utils'
 import { vi } from 'vitest'
 
+function createMemoryStorage(): Storage {
+  const values = new Map<string, string>()
+
+  return {
+    get length() {
+      return values.size
+    },
+    clear() {
+      values.clear()
+    },
+    getItem(key: string) {
+      return values.has(key) ? values.get(key)! : null
+    },
+    key(index: number) {
+      return Array.from(values.keys())[index] ?? null
+    },
+    removeItem(key: string) {
+      values.delete(key)
+    },
+    setItem(key: string, value: string) {
+      values.set(key, String(value))
+    }
+  }
+}
+
+if (typeof globalThis.localStorage === 'undefined' || typeof globalThis.localStorage.getItem !== 'function') {
+  Object.defineProperty(globalThis, 'localStorage', {
+    configurable: true,
+    value: createMemoryStorage()
+  })
+}
+
+if (typeof window !== 'undefined' && typeof window.localStorage.getItem !== 'function') {
+  Object.defineProperty(window, 'localStorage', {
+    configurable: true,
+    value: globalThis.localStorage
+  })
+}
+
 // Mock requestIdleCallback (Safari < 15 不支持)
 if (typeof globalThis.requestIdleCallback === 'undefined') {
   globalThis.requestIdleCallback = ((callback: IdleRequestCallback) => {
diff --git a/frontend/vitest.config.ts b/frontend/vitest.config.ts
index 39568250..8c45a9ff 100644
--- a/frontend/vitest.config.ts
+++ b/frontend/vitest.config.ts
@@ -13,6 +13,7 @@ export default defineConfig({
   test: {
     globals: true,
     environment: 'jsdom',
+    setupFiles: ['./src/__tests__/setup.ts'],
     include: ['src/**/*.{test,spec}.{js,ts,jsx,tsx}'],
     exclude: ['node_modules', 'dist'],
     coverage: {