webapp-testing

Test local web applications with Python Playwright scripts and managed server lifecycles.

Updated May 24, 2026
One-click install
npx skills add https://github.com/MWest2020/skill-forge --skill webapp-testing-mwest2020
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: webapp-testing
Source: https://github.com/MWest2020/skill-forge/tree/main/skills/webapp-testing
Command: npx skills add https://github.com/MWest2020/skill-forge --skill webapp-testing-mwest2020

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires playwright, and includes scripts (resource) components.

What problem does it solve? Testing local web applications requires manually starting servers, waiting for them to be ready, and writing browser automation that accounts for dynamic JavaScript rendering. This Skill removes that friction by managing server lifecycles and providing proven Playwright patterns for interacting with rendered pages. ## Core Features & Use Cases - Server Lifecycle Management: The with_server.py helper starts one or more servers (e.g., backend plus frontend), waits for each port to be ready, runs your automation, and cleans up afterward. - Reconnaissance-Then-Action Pattern: Inspect the rendered DOM via screenshots and selectors after waiting for networkidle, then execute actions against discovered elements. - Use Case: You need to verify a React frontend talking to a Flask backend. Run both servers through the helper, then use a Playwright script to navigate, capture a screenshot, and assert that key buttons and inputs render correctly. ## Quick Start Ask the agent to start your dev server with the with_server.py helper and write a Playwright script that loads the page, waits for networkidle, and screenshots the result.

Frequently Asked Questions about webapp-testing

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I test a local web application with Playwright?

Write a Python script using sync_playwright, launch Chromium in headless mode, navigate to your localhost URL, and wait for networkidle before interacting with elements. Use the with_server.py helper to start your dev server automatically before the script runs.

How do I run multiple servers for frontend and backend testing?

Pass multiple --server and --port pairs to with_server.py, one per server. It starts each server, waits for its port to accept connections, runs your test command, then terminates all servers cleanly.

Why does Playwright find no elements on my dynamic web app?

The DOM is inspected before JavaScript finishes rendering. Call page.wait_for_load_state('networkidle') after navigation so dynamic content loads before you query selectors or take screenshots.

Can Playwright automate static HTML files without a server?

Yes. Read the HTML file directly to identify selectors, then load it in Playwright using a file:// URL. No server is needed for static pages, which simplifies the automation script.

Should I read helper script source code before running it?

No. Run scripts with --help first and treat them as black-box tools. Reading large scripts into context wastes the context window; only inspect source when the default behavior cannot accomplish your task.