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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.

Author

@ComposioHQ

Category

Development Tools

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webapp-testing - Local Web Application Automation Testing Tool

Skill Overview


webapp-testing is a Python toolkit based on Playwright, designed specifically for testing local web applications. It provides comprehensive automated testing capabilities, including server management, element discovery, UI debugging, and browser log capture.

Applicable Scenarios

  • Testing in Local Development Environments - For starting and testing locally running frontend applications and decoupled frontend-backend projects. The tool includes server lifecycle management and supports both single-server and multi-server environments.

  • Frontend Functionality Verification and UI Debugging - Verify whether page interaction logic works correctly, capture browser screenshots to troubleshoot UI issues, and inspect console logs to locate frontend errors. It is suitable for developer self-testing and QA regression testing.

  • Dynamic Page Element Discovery and Automation - For dynamic applications that require JavaScript rendering, it provides a Reconnaissance-Then-Action workflow: identify selectors first, then perform actions to avoid unstable tests caused by timing issues.

    • Core Features

  • Automated Server Lifecycle Management - The with_server.py helper script automatically starts and stops the server processes required for testing, and supports managing multiple servers simultaneously (such as a frontend development server and a backend API server). This allows developers to focus on writing Playwright test logic without manually setting up the environment.

  • Playwright Python Script Development - Provides full support for the synchronous API, including page navigation, waiting for network idle, retrieving DOM content, identifying element selectors, capturing screenshots, and collecting console logs. It covers testing needs ranging from static HTML to complex single-page applications.

  • Reconnaissance-Then-Action Testing Workflow - For dynamic web applications, first wait for networkidle to ensure JavaScript execution is complete, then identify target element selectors through screenshots and DOM inspection, and finally perform automated actions. This avoids test failures caused by pages not being ready.

    • Frequently Asked Questions

    What types of web applications does webapp-testing support?

    It supports static HTML files and dynamic web applications that require JavaScript rendering, including single-page applications (SPAs), decoupled frontend-backend projects, and any local or remote web page accessible via HTTP.

    How can I test a local application that requires a server to be started?

    Use the with_server.py helper script provided by the tool, which automatically manages server processes. For a single-server scenario, run python scripts/with_server.py --server "npm run dev" --port 5173 -- python your_automation.py. For multiple servers (such as frontend and backend servers), specify multiple --server parameters in the command.

    Why must I wait for networkidle before testing?

    Dynamic web applications rely on JavaScript to asynchronously load data and render the DOM. Checking page elements too early may cause selectors not to be found or states to be incorrect. page.wait_for_load_state('networkidle') ensures that testing continues only after all network requests are complete, making it a crucial step for stable testing.