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🎯

webapp-testing

🎯Skill

from commandcodeai/agent-skills

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What it does

Automates web application testing using Playwright, enabling browser interaction, UI verification, and screenshot capture for local development environments.

πŸ“¦

Part of

commandcodeai/agent-skills(3 items)

webapp-testing

Installation

PythonRun Python server
python scripts/with_server.py --server "npm run dev" --port 5173 -- python your_automation.py
PythonRun Python server
python scripts/with_server.py \
πŸ“– Extracted from docs: commandcodeai/agent-skills
Need more details? View full documentation on GitHub β†’
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AddedFeb 4, 2026
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Skill Details

SKILL.md

Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs.

Overview

# 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. 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.

Decision Tree: Choosing Your Approach

```

User task β†’ Is it static HTML?

β”œβ”€ Yes β†’ Read HTML file directly to identify selectors

β”‚ β”œβ”€ Success β†’ Write Playwright script using selectors

β”‚ └─ Fails/Incomplete β†’ Treat as dynamic (below)

β”‚

└─ No (dynamic webapp) β†’ Is the server already running?

β”œβ”€ No β†’ Run: python scripts/with_server.py --help

β”‚ Then use the helper + write simplified Playwright script

β”‚

└─ Yes β†’ 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:

```bash

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

```

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

```bash

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

```

To create an automation script, include only Playwright logic (servers are managed automatically):

```python

from playwright.sync_api import sync_playwright

with sync_playwright() as p:

browser = p.chromium.launch(headless=True) # Always launch chromium in headless mode

page = browser.new_page()

page.goto('http://localhost:5173') # Server already running and ready

page.wait_for_load_state('networkidle') # CRITICAL: Wait for JS to execute

# ... your automation logic

browser.close()

```

Reconnaissance-Then-Action Pattern

  1. Inspect rendered DOM:

```python

page.screenshot(path='/tmp/inspect.png', full_page=True)

content = page.content()

page.locator('button').all()

```

  1. Identify selectors from inspection results
  1. Execute actions using discovered selectors

Common Pitfall

❌ Don't inspect the DOM before waiting for networkidle on dynamic apps

βœ… Do wait for page.wait_for_load_state('networkidle') before inspection

Best Practices

  • 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.
  • Use sync_playwright() for synchronous scripts
  • Always close the browser when done
  • Use descriptive selectors: text=, role=, CSS selectors, or IDs
  • Add appropriate waits: page.wait_for_selector() or page.wait_for_timeout()

Reference Files

  • examples/ - Examples showing common patterns:

- element_discovery.py - Discovering buttons, links, and inputs on a page

- static_html_automation.py - Using file:// URLs for local HTML

- console_logging.py - Capturing console logs during automation

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