webapp-testing
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.
When & Why to Use This Skill
This Claude skill provides a comprehensive toolkit for interacting with and testing local web applications using Playwright. It streamlines the process of verifying frontend functionality, debugging complex UI behaviors, and ensuring application stability through automated browser interactions, high-resolution screenshot captures, and detailed browser log analysis.
Use Cases
- Automated Frontend Verification: Create and execute native Playwright scripts to verify that user interfaces and critical user journeys function correctly across various browser states.
- UI Debugging and Troubleshooting: Identify and resolve frontend bugs by capturing real-time browser screenshots and inspecting console logs to pinpoint JavaScript errors or layout shifts.
- Local Development Server Management: Utilize built-in helper scripts to manage the lifecycle of local servers, enabling seamless end-to-end testing environments during the coding process.
- Dynamic Web App Reconnaissance: Navigate complex single-page applications (SPAs), wait for network idle states, and inspect the rendered DOM to identify selectors for robust automation scripts.
- Visual Regression Testing: Capture and compare browser screenshots to ensure that UI updates do not introduce unintended visual changes or regressions.
| name | webapp-testing |
|---|---|
| description | 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. |
| license | Complete terms in LICENSE.txt |
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 → 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