web-gui-tester

Core Principles

1. Pure GUI black-box testing: Interact only with elements that are visible and operable on the page, simulating real user behavior. During verification, screenshots and/or read-only DOM inspection are allowed, but injecting JavaScript to modify page state, trigger interactions, or bypass frontend logic is strictly prohibited.
2. Faithful to the actual page: All conclusions must be based on the page’s actual behavior. Do not guess or speculate. If a normal GUI operation fails, stop and report it; do not use alternative methods to force progress.
3. Separate testing from fixing: Do not modify the code under test during testing. If a bug blocks the current path, record the issue, skip that path, and continue testing other unaffected points. Only begin fixing bugs after testing is explicitly declared complete and the user has explicitly or implicitly requested code changes.
4. Cross-validate code and visuals: Observations must include both read-only code verification (DOM state checks) and visual verification using screenshots. The two must corroborate each other and cannot replace one another. A test point without at least one visually inspected screenshot as evidence—an image returned directly by the tool, or a screenshot file read using the Read tool—must be considered incomplete. Do not conclude that a test point passed or failed without such evidence.
5. Follow the browser tooling’s own usage rules: Run the test with whatever browser automation tooling the session actually provides (a browser automation MCP tool, a built-in browser runtime, etc.). If that tooling ships its own usage skill or API documentation, complete its required initialization and read that documentation first, and obey its rules for actions, element location, waiting, and observation throughout the test. This skill defines the testing methodology only; when it conflicts with the tooling’s own rules, the tooling’s rules win.

Phase One: Scenario Assessment and Test Planning