diff --git a/entrypoints/options/__tests__/App.test.tsx b/entrypoints/options/__tests__/App.test.tsx
index fb26771..d627a0c 100644
--- a/entrypoints/options/__tests__/App.test.tsx
+++ b/entrypoints/options/__tests__/App.test.tsx
@@ -21,6 +21,7 @@ vi.mock('react-i18next', () => ({
   useTranslation: () => ({
     t: (key: string) => key,
   }),
+  withTranslation: () => (Component: any) => Component,
 }));
 
 describe('Options App', () => {
diff --git a/pages/Base64Converter/__tests__/TextMode.test.tsx b/pages/Base64Converter/__tests__/TextMode.test.tsx
index c5d86d3..7dc94bd 100644
--- a/pages/Base64Converter/__tests__/TextMode.test.tsx
+++ b/pages/Base64Converter/__tests__/TextMode.test.tsx
@@ -4,6 +4,7 @@ import TextMode from '../TextMode';
 
 // Mock CopyButton
 vi.mock('@/components/CopyButton', () => ({
+  CopyButton: ({ text }: { text: string }) => <button data-testid="copy-button">{text}</button>,
   default: ({ text }: { text: string }) => <button data-testid="copy-button">{text}</button>,
 }));
 
@@ -39,7 +40,7 @@ describe('TextMode', () => {
     await waitFor(() => {
       expect(screen.getByText('base64Converter:base64Output')).toBeInTheDocument();
     });
-    expect(screen.getByTestId('copy-button')).toHaveTextContent('SGVsbG8=');
+    expect(screen.getByRole('button', { name: 'SGVsbG8=' })).toBeInTheDocument();
   });
 
   it('应该解码 Base64 文本', async () => {
@@ -58,7 +59,7 @@ describe('TextMode', () => {
     await waitFor(() => {
       expect(screen.getByText('base64Converter:textOutput')).toBeInTheDocument();
     });
-    expect(screen.getByTestId('copy-button')).toHaveTextContent('Hello');
+    expect(screen.getByRole('button', { name: 'Hello' })).toBeInTheDocument();
   });
 
   it('应该对无效 Base64 显示错误', async () => {
@@ -91,7 +92,7 @@ describe('TextMode', () => {
     });
 
     await waitFor(() => {
-      expect(screen.getByTestId('copy-button')).toHaveTextContent('SGVsbG8=');
+      expect(screen.getByRole('button', { name: 'SGVsbG8=' })).toBeInTheDocument();
     });
 
     // 切换方向
@@ -99,7 +100,7 @@ describe('TextMode', () => {
 
     // 输出应该被清除
     await waitFor(() => {
-      expect(screen.queryByTestId('copy-button')).not.toBeInTheDocument();
+      expect(screen.queryByRole('button', { name: 'SGVsbG8=' })).not.toBeInTheDocument();
     });
   });
 
@@ -114,13 +115,13 @@ describe('TextMode', () => {
     });
 
     await waitFor(() => {
-      expect(screen.getByTestId('copy-button')).toHaveTextContent('SGVsbG8=');
+      expect(screen.getByRole('button', { name: 'SGVsbG8=' })).toBeInTheDocument();
     });
 
     fireEvent.click(screen.getByRole('button', { name: 'textInputArea.clear' }));
 
     await waitFor(() => {
-      expect(screen.queryByTestId('copy-button')).not.toBeInTheDocument();
+      expect(screen.queryByRole('button', { name: 'SGVsbG8=' })).not.toBeInTheDocument();
       expect(input).toHaveValue('');
     });
   });
diff --git a/vitest.setup.ts b/vitest.setup.ts
index 5e13962..d20df79 100644
--- a/vitest.setup.ts
+++ b/vitest.setup.ts
@@ -1,5 +1,26 @@
 import '@testing-library/jest-dom';
 import { afterEach, beforeEach, vi } from 'vitest';
+import { readFileSync } from 'fs';
+import { resolve } from 'path';
+import React from 'react';
+
+// 读取中文翻译文件用于 withTranslation mock
+const zhCommon = JSON.parse(
+  readFileSync(resolve(__dirname, 'i18n/locales/zh/common.json'), 'utf-8'),
+);
+
+// 支持嵌套 key 查找，如 "errorBoundary.title" → zhCommon.errorBoundary.title
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+function nestedLookup(obj: Record<string, any>, key: string): string | undefined {
+  const parts = key.split('.');
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  let current: any = obj;
+  for (const part of parts) {
+    if (current == null || typeof current !== 'object') return undefined;
+    current = current[part];
+  }
+  return typeof current === 'string' ? current : undefined;
+}
 
 vi.mock('@/utils/useLazyTranslation', () => ({
   useLazyTranslation: (ns?: string) => ({
@@ -21,12 +42,53 @@ vi.mock('react-i18next', () => ({
       language: 'zh-CN',
     },
   }),
+  withTranslation: (ns?: string) => {
+    const translations = ns === 'common' ? zhCommon : {};
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    return (Component: React.ComponentType<any>) => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const Wrapped = (props: any) =>
+        React.createElement(Component, {
+          ...props,
+          t: (key: string) => nestedLookup(translations, key) || key,
+          i18n: { language: 'zh-CN', changeLanguage: vi.fn() },
+        });
+      Wrapped.displayName = `withTranslation(${Component.displayName || Component.name || 'Component'})`;
+      return Wrapped;
+    };
+  },
   initReactI18next: {
     type: '3rdParty',
     init: vi.fn().mockResolvedValue(undefined),
   },
 }));
 
+vi.mock('@/components/CopyButton', () => ({
+  CopyButton: ({
+    text,
+    tooltip,
+    onClick,
+  }: {
+    text: string;
+    tooltip?: string;
+    onClick?: (e: React.MouseEvent) => void;
+  }) =>
+    React.createElement(
+      'button',
+      {
+        'aria-label': tooltip || 'copy',
+        type: 'button',
+        onClick: async (e: React.MouseEvent) => {
+          if (text) {
+            await navigator.clipboard.writeText(text);
+          }
+          onClick?.(e);
+        },
+      },
+      'Copy',
+    ),
+}));
+
 const storageMock = {
   local: {
     get: vi.fn().mockImplementation(() => Promise.resolve({})),