[codex] upgrade tests to React 18

[zombieJ]

Summary

• Raise React and React DOM peer/dev dependencies to React 18.
• Drop Enzyme and the Enzyme adapter from dev dependencies.
• Convert the test suite to Testing Library render/fireEvent/act APIs.

Validation

• npm run lint
• bunx tsc --noEmit
• npm run compile
• bun run test -- --coverage --silent

Summary by CodeRabbit

• 兼容性更新

  • 最低 React 要求从 16.9.0 提升到 18.0.0

• 开发依赖

  • 更新若干开发依赖版本（包括 React/React DOM 与测试/渲染相关库）

• 测试

  • 大量测试从 Enzyme 迁移到 React Testing Library，测试用例改为基于 DOM 查询与 fireEvent/act，若干异步/定时器相关断言同步调整

[vercel]

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Project	Deployment	Actions	Updated (UTC)
virtual-list	Ready	Preview, Comment	May 20, 2026 8:16am

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

Walkthrough

本 PR 升级 package.json 中的 peer/dev 依赖以支持 React 18，并将大量测试从 Enzyme 重写为 @testing-library/react（包含导入、辅助函数、事件触发、act 包裹和断言适配）。

Changes

依赖升级与测试迁移

Layer / File(s)	Summary
React 及测试库依赖升级 package.json	peerDependencies 中 react/react-dom 最低版本从 >=16.9.0 提升到 >=18.0.0；devDependencies 中升级 @testing-library/react、rc-test，并将 dev 依赖的 react/react-dom 升至 ^18.3.1。
测试引入与辅助函数迁移 tests/*	统一将测试导入从 Enzyme/react-dom/test-utils 切换为 @testing-library/react，新增/改写 genNode/genList、getHolder、getScrollOffset 等测试工具以基于 DOM 断言。
List 测试适配 DOM 断言 tests/list.test.js	将 List 相关测试从读取组件 props 改为基于渲染后样式与 translateY/height 的 DOM 检查，使用 rerender 驱动状态切换并改用 onLibResize 触发高度收集。
scroll.test 的全面迁移与 act() 修正 tests/scroll.test.js	将大量滚动、滚动条与边界测试改写为 RTL，使用 createEvent/fireEvent、act 包裹 scrollTo 与 jest.runAllTimers()，并用 DOM 查询替换 Enzyme 实例断言。
scrollWidth 的 act 包裹 tests/scrollWidth.test.tsx	为 ref 的 scrollTo 调用添加 act(() => ...) 包裹以保证断言前更新完成。
Firefox 专用测试迁移 tests/scroll-Firefox.test.js	将 UL 节点获取改为 container.querySelector('ul') 并直接断言 scrollTop 以替代 Enzyme instance 用法。
mock/props/test 的 RTL 重写 tests/mock.test.js, tests/props.test.js	将测试断言从 Enzyme wrapper 转为 DOM 查询（container、querySelector、textContent），移除对 Enzyme 的依赖并保持原断言语义。
触摸交互测试迁移 tests/touch.test.js	触摸滚动测试改为使用 RTL 渲染、在 act 内触发触摸事件并显式 unmount() 清理。

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

Suggested reviewers

• afc163

Poem

🐰 我在草丛间跳跃写测试，
把旧的 mount 换成 render 的节拍，
act 把时序轻轻包裹，定时器也乖，
依赖升级到十八号，代码安然入睡，
小胡萝卜祝合并顺利 🥕✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	PR标题准确反映了主要变更内容——升级React和测试相关依赖至React 18，并更新测试代码以适配React 18。
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/react-18-upgrade

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.48%. Comparing base (8d2ead3) to head (4e7fda9).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #359   +/-   ##
=======================================
  Coverage   97.48%   97.48%           
=======================================
  Files          19       19           
  Lines         796      796           
  Branches      189      191    +2     
=======================================
  Hits          776      776           
  Misses         20       20           

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[gemini-code-assist]

Code Review

This pull request upgrades the project to React 18, updating peer and development dependencies including React, React DOM, and testing libraries like @testing-library/react and enzyme. Additionally, it updates test files to wrap scrollTo calls within act() blocks to ensure compatibility with React 18's rendering behavior. I have no feedback to provide as there were no review comments.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​testing-library/​react@​13.4.0

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