webapp-testing

Write a Python script using sync_playwright, launch Chromium in headless mode, navigate to your localhost URL, and wait for the networkidle load state before interacting with elements. Use selectors like text=, role=, or CSS to target buttons and inputs.

Use the with_server.py helper script, passing your server command and port, followed by the automation command. It starts the server, polls the port until ready, runs your script, and terminates the server afterward. It also supports multiple servers.

Yes, Playwright can open local HTML files directly using file:// URLs built from the absolute file path. You can then click elements, fill forms, and take screenshots exactly as you would with a served page.

Dynamic apps render content via JavaScript after initial load, so inspecting the DOM too early misses elements. Always call page.wait_for_load_state('networkidle') before querying selectors or taking screenshots.

Register a handler with page.on('console', handler) before navigating. Each console message is passed to your callback, where you can print or collect the message type and text, then save them to a log file after the browser closes.