Full Guide: Setting Up Node.js, Playwright, and Trae CN for AI Testing

1. Pain points

Typical obstacles when starting AI‑assisted test automation:

Uncertainty about required software and installation order.

Version constraints (Node.js must meet Playwright requirements).

Lack of guidance on integrating AI coding assistants with Playwright.

2. Three‑step environment setup

Step 1 – Install Node.js

Playwright runs on Node.js, so a compatible runtime is mandatory.

Check existing installation:

node -v
npm -v

If the commands output a version (e.g., v20.12.0 and 10.5.0), Node.js is already present.

Recommended LTS releases: Node.js 18.x or Node.js 20.x .

Download from https://nodejs.org/ and select the LTS installer for your OS:

Windows – run the .msi installer.

macOS – run the .pkg installer.

Linux – use a package manager (e.g., nvm or n).

Verify installation after installation:

node -v   # e.g., v20.12.0
npm -v    # e.g., 10.5.0

Step 2 – Install Playwright

Create a dedicated project directory and enter it:

# Create directory
mkdir playwright-tests
# Enter directory
cd playwright-tests

Initialize an npm project (creates package.json): npm init -y Install Playwright as a development dependency: npm install -D @playwright/test The -D flag adds it to devDependencies; @playwright/test provides the test runner.

Install browser drivers (Chromium, Firefox, WebKit): npx playwright install If network speed is limited, install only Chromium to reduce size: npx playwright install chromium Verify Playwright installation:

npx playwright --version   # e.g., Version 1.43.0

Create a first test file tests/login.spec.ts:

// tests/login.spec.ts
import { test, expect } from '@playwright/test';

test('page loads', async ({ page }) => {
  // Navigate to login page
  await page.goto('https://sogoodtool.com/#/login');
  // Verify title contains "登录"
  await expect(page).toHaveTitle(/登录/);
});

Run the test:

npx playwright test
# or run a specific file
npx playwright test tests/login.spec.ts

Successful execution confirms a functional Playwright environment.

Step 3 – Install Trae CN (AI‑assisted coding tool)

Trae CN provides a Chinese UI, supports multiple AI models, and integrates directly with editors, making it suitable for AI test engineers.

Download from https://trae.cn/ and choose the installer matching your OS:

Windows – .exe or .zip.

macOS – .dmg.

Linux – .AppImage or .deb.

First‑time configuration:

Log in or create an account.

Configure an AI model (use the built‑in model or provide a custom API key).

Open the project folder (File → Open Folder → playwright-tests).

Using Trae CN to assist test writing:

Method 1 – Direct query: type a request such as “帮我写一个 Playwright 测试用例，测试 sogoodtool.com 的登录功能”.

Method 2 – Query selected code: select a snippet and ask “这段代码有什么问题？怎么优化？”

Method 3 – Comment‑driven generation: write comments like:

// 请帮我写一个测试，验证用户登录成功后跳转到 dashboard
// 1. 打开登录页面
// 2. 输入邮箱和密码
// 3. 点击登录按钮
// 4. 验证跳转到 dashboard

Trae CN will generate the corresponding test code.

3. Environment checklist

┌─────────────────────────────────────────────────────────┐
│                 Environment Checklist                  │
├─────────────────────────────────────────────────────────┤
│  【Node.js】                                            │
│   ├── ✅ node -v shows version (v18+ or v20+)           │
│   └── ✅ npm -v shows version                           │
│  【Playwright】                                         │
│   ├── ✅ package.json contains @playwright/test        │
│   ├── ✅ npx playwright --version shows version          │
│   ├── ✅ browser drivers installed (Chromium, …)       │
│   └── ✅ npx playwright test runs tests                │
│  【Trae CN】                                            │
│   ├── ✅ Trae CN launches successfully                │
│   ├── ✅ Project folder can be opened                  │
│   └── ✅ AI dialogue works                            │
└─────────────────────────────────────────────────────────┘

4. Common issues and solutions

Issue 1 – Playwright browser download timeout

# Method 1: use a domestic mirror
PLAYWRIGHT_DOWNLOAD_HOST=https://npmmirror.com/mirrors/playwright npx playwright install
# Method 2: install only Chromium
npx playwright install chromium

Issue 2 – Node.js version too old

# Check current version
node -v
# If version < 18, upgrade:
# Windows – reinstall from https://nodejs.org/
# macOS/Linux – use n or nvm to manage versions

Issue 3 – Insufficient permissions

# Windows – run command line as Administrator
# macOS/Linux – use sudo (or adjust directory permissions)

Issue 4 – Test run errors

# Show detailed error information
npx playwright test --reporter=list
# Or run in UI mode
npx playwright test --ui