webapp-testing

Web Application Testing

To test local web applications, use Playwright to connect to existing Chrome CDP instances.

⚠️ 铁律：禁止 chromium.launch()。一律 connect_over_cdp() 复用已有 Chrome 实例。 Mac 上最多运行多个 Chrome 实例（LaunchAgent 管理），新页面开 tab，不开新进程。 违反此规则会导致僵尸 Chrome 进程泄漏。

Helper Scripts Available:

• scripts/with_server.py - Manages server lifecycle (supports multiple servers)

Always run scripts with --help first to see usage. DO NOT read the source until you try running the script first and find that a customized solution is absolutely necessary. These scripts can be very large and thus pollute your context window. They exist to be called directly as black-box scripts rather than ingested into your context window.

Chrome CDP 实例（只连接，不启动）

用途	CDP 端口	何时用
截图/测试/无登录态	18800 (openclaw headless)	默认选这个
需要登录态的站点	按需配置其他端口	已登录的 Chrome 实例

Decision Tree: Choosing Your Approach

User task → Is it static HTML?
    ├─ Yes → Read HTML file directly to identify selectors
    │         ├─ Success → Write Playwright script using selectors
    │         └─ Fails/Incomplete → Treat as dynamic (below)
    │
    └─ No (dynamic webapp) → Is the server already running?
        ├─ No → Run: python scripts/with_server.py --help
        │        Then use the helper + write simplified Playwright script
        │
        └─ Yes → Reconnaissance-then-action:
            1. Navigate and wait for networkidle
            2. Take screenshot or inspect DOM
            3. Identify selectors from rendered state
            4. Execute actions with discovered selectors

Example: Using with_server.py

To start a server, run --help first, then use the helper:

Single server:

python scripts/with_server.py --server "npm run dev" --port 5173 -- python your_automation.py

Multiple servers (e.g., backend + frontend):

python scripts/with_server.py \
  --server "cd backend && python server.py" --port 3000 \
  --server "cd frontend && npm run dev" --port 5173 \
  -- python your_automation.py