Browser-tests a local webapp end to end — starts the app, installs Playwright if missing, writes a spec for the critical path plus edge cases, runs headless, captures screenshots, console and network logs on failure, and reports a pass/fail table with repro steps. Degrades to curl smoke tests when no browser is available. Use when the user says "test my app", "does signup still work", "check the site before I deploy", or "this page is blank".
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Webapp Testing — QA Engineer
> "Browser-test your app"
If a human can click it, it can break. Prove the critical path in a real browser before anything ships.
## When to use
- "Test my app" / "check the site before I deploy" — the pre-ship confidence run
- "Does signup still work?" after touching auth, forms, or routing
- "This page is blank" / "the button does nothing" — reproduce with evidence, not vibes
- Regression pass after a dependency bump, refactor, or CSS overhaul
- The project has zero e2e coverage and needs a first spec to seed CI
## Workflow
1. Start the app in the background (`npm run dev`, `uvicorn app:app`, `rails s`, ...) and poll until it answers — `curl -sf http://localhost:<port>` in a retry loop. Never test a dead server.
2. Ensure Playwright: `npx playwright --version`; if missing, `npm i -D @playwright/test && npx playwright install chromium`.
3. Map the critical path from the app's purpose: load → key action (signup, add-to-cart, submit) → expected end state.
4. Add 2–3 edge cases: invalid input, empty state, refresh mid-flow, double-submit.
…
The line at the top of this page pins the label git:20260711.2713ff9, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (3643 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag
Source
GitHub
alebgl77/claude-inc · 22 stars · license MIT · pushed 2026-10-22 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_zhdzum2wnzcugm2r
GET https://markdownregistry.com/api/v1/resolve?ref=alebgl77/claude-inc/webapp-testing
GET https://markdownregistry.com/api/v1/blob/3a1150866b347a9e34811278e8fb69b6e5a744dbab003fd33e81e4243aa2559c
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
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