fix(test): 修复测试环境问题

1. jest.setup.js:
   - 添加 Request/Response/Headers 全局对象 mock
   - 解决 'Request is not defined' 错误

2. .eslintrc.json:
   - 将 jest.setup.js 添加到忽略列表

3. shared-mocks.tsx:
   - 添加 ArrowUp 图标 mock

4. back-to-top.test.tsx:
   - 重写测试使用 import 语法
   - 使用 fireEvent.scroll 触发滚动事件
   - 修复组件渲染测试

src/__mocks__/shared-mocks.tsx

@@ -84,6 +84,7 @@ export const mockLucideReact = () => {
   jest.mock('lucide-react', () => ({
     ArrowRight: () => <span data-testid="arrow-right" />,
     ArrowLeft: () => <span data-testid="arrow-left" />,
+    ArrowUp: () => <span data-testid="arrow-up" />,
     Shield: () => <span data-testid="shield-icon" />,
     Zap: () => <span data-testid="zap-icon" />,
     Award: () => <span data-testid="award-icon" />,

src/components/ui/back-to-top.test.tsx

@@ -1,43 +1,58 @@
-import { render, screen, fireEvent, waitFor } from '@testing-library/react';
+import React from 'react';
+import { render, screen, fireEvent, waitFor, act } from '@testing-library/react';
 import { BackToTop } from './back-to-top';
 
-// Mock useReducedMotion
 jest.mock('@/hooks/use-reduced-motion', () => ({
   useReducedMotion: () => false,
 }));
 
-// Mock AnimatePresence to always render children
 jest.mock('framer-motion', () => ({
-  ...jest.requireActual('framer-motion'),
   AnimatePresence: ({ children }: { children: React.ReactNode }) => <>{children}</>,
   motion: {
     button: ({ children, ...props }: React.ComponentProps<'button'>) => <button {...props}>{children}</button>,
   },
+  useAnimation: () => ({
+    start: jest.fn(),
+    stop: jest.fn(),
+  }),
+  useMotionValue: () => ({
+    get: jest.fn(),
+    set: jest.fn(),
+  }),
+}));
+
+jest.mock('lucide-react', () => ({
+  ArrowUp: () => <span data-testid="arrow-up-icon" />,
 }));
 
 describe('BackToTop', () => {
   let scrollYValue = 0;
+  const originalScrollY = Object.getOwnPropertyDescriptor(window, 'scrollY');
+  const originalScrollTo = window.scrollTo;
   
   beforeEach(() => {
     jest.clearAllMocks();
     scrollYValue = 0;
+    
     Object.defineProperty(window, 'scrollY', {
       get: () => scrollYValue,
       configurable: true,
     });
+    
     window.scrollTo = jest.fn();
-    window.addEventListener = jest.fn((event, handler) => {
-      if (event === 'scroll') {
-        // 模拟滚动事件触发
-        (handler as EventListener)(new Event('scroll'));
-      }
-    });
+  });
+
+  afterEach(() => {
+    if (originalScrollY) {
+      Object.defineProperty(window, 'scrollY', originalScrollY);
+    }
+    window.scrollTo = originalScrollTo;
   });
 
   it('should not render when scroll position is less than 500px', () => {
     scrollYValue = 0;
     const { container } = render(<BackToTop />);
-    expect(container.firstChild).toBeNull();
+    expect(container.querySelector('button')).toBeNull();
   });
 
   it('should render button when scroll position is more than 500px', async () => {
@@ -45,8 +60,12 @@ describe('BackToTop', () => {
     
     render(<BackToTop />);
     
+    act(() => {
+      fireEvent.scroll(window);
+    });
+    
     await waitFor(() => {
-      const button = screen.getByRole('button', { name: /返回顶部/i });
+      const button = screen.queryByRole('button', { name: /返回顶部/i });
       expect(button).toBeInTheDocument();
     });
   });
@@ -56,11 +75,14 @@ describe('BackToTop', () => {
     
     render(<BackToTop />);
     
-    await waitFor(() => {
-      const button = screen.getByRole('button', { name: /返回顶部/i });
-      fireEvent.click(button);
+    act(() => {
+      fireEvent.scroll(window);
     });
     
+    const button = await screen.findByRole('button', { name: /返回顶部/i });
+    
+    fireEvent.click(button);
+    
     expect(window.scrollTo).toHaveBeenCalledWith({
       top: 0,
       behavior: 'smooth',
@@ -72,10 +94,12 @@ describe('BackToTop', () => {
     
     render(<BackToTop />);
     
-    await waitFor(() => {
-      const button = screen.getByRole('button');
-      expect(button).toHaveAttribute('aria-label', '返回顶部');
-      expect(button).toHaveAttribute('title', '返回顶部');
+    act(() => {
+      fireEvent.scroll(window);
     });
+    
+    const button = await screen.findByRole('button');
+    expect(button).toHaveAttribute('aria-label', '返回顶部');
+    expect(button).toHaveAttribute('title', '返回顶部');
   });
 });