webapp-testing

> Vendored from [anthropics/skills](https://github.com/anthropics/skills) under Apache-2.0. Modified: description rewrite, a Delegating section pointing at the paired `webapp-tester` agent shipped in this repo, and a tone pass (emoji and all-caps emphasis removed). # Web Application Testing To test local web applications, write native Python Playwright scripts. **Helper Scripts Available**: - `scripts/with_server.py` - Manages server lifecycle (supports multiple servers) **Always run scripts with `--help` first** to see usage. Don't read the source until the script has been run and shown not to fit the task. These scripts can be large; reading them pollutes your context window. They exist to be called directly as black boxes. ## Decision Tree: Choosing Your Approach UI/frontend only. For pure backend/API assertions without a browser, use Playwright's request context or a plain HTTP client instead (see Limits). ``` 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...