Web App Testing

researched 2026-05-25· 1 source · 6 concepts · skill webapp-testing

To test local web applications, write native Python Playwright scripts.

Web Application Testing

To test local web applications, write native Python Playwright scripts. [source]
Helper Scripts Available: [source]
scripts/with_server.py - Manages server lifecycle (supports multiple servers) [source]
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 abslutely 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. [source]

To start a server, run --help first, then use the helper: [source]
Multiple servers (e.g., backend + frontend): [source]
To create an automation script, include only Playwright logic (servers are managed automatically): [source]

❌ Don't inspect the DOM before waiting for networkidle on dynamic apps [source]
✅ Do wait for page.wait_for_load_state('networkidle') before inspection [source]

Use bundled scripts as black boxes - To accomplish a task, consider whether one of the scripts available in scripts/ can help. These scripts handle common, complex workflows reliably without cluttering the context window. Use --help to see usage, then invoke directly. [source]
Use sync_playwright() for synchronous scripts [source]
Always close the browser when done [source]
Use descriptive selectors: text=, role=, CSS selectors, or IDs [source]
Add appropriate waits: page.wait_for_selector() or page.wait_for_timeout() [source]

examples/ - Examples showing common patterns: [source]
element_discovery.py - Discovering buttons, links, and inputs on a page [source]
static_html_automation.py - Using file:// URLs for local HTML [source]
console_logging.py - Capturing console logs during automation [source]

Frontier under this node: Browser Log Inspection, Browser Screenshot Capture, Frontend Functionality Verification, Playwright Integration