Use when writing or maintaining end-to-end tests — Playwright (preferred) or Cypress critical-flow suites. Pattern playbook: page objects, stable selectors, fixtures and isolation, condition-based waiting, flaky quarantine, CI wiring. Backs the e2e-runner agent.
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
# E2E Testing — critical flows, stable and honest
Playbook for functional end-to-end tests. The `e2e-runner` agent does the writing; this skill is the pattern set it follows.
<HARD-RULES>
- Test CRITICAL user journeys (the flows that, broken, mean the product is broken) — not every button. Exhaustive UI coverage is unit/component work, not E2E.
- Selectors: role-based (`getByRole`) or test IDs (`data-testid`) — NEVER brittle CSS/text that breaks on copy changes.
- Wait on CONDITIONS (`expect(...).toBeVisible()`, `waitForResponse`) — never on fixed timeouts (`waitForTimeout`). Timeouts are the #1 source of flake.
- Flaky specs are quarantined and reported, never retried-until-green. A hidden flake is a lie about coverage.
</HARD-RULES>
## Page-object model
- One class/module per page or major component: selectors + actions live there, tests read as user intent (`await loginPage.signInAs(user)`), not selector soup.
- Tests assert outcomes; page objects encapsulate how.
## Fixtures and isolation
- Each test owns its data and starts from a known state (seeded via API/fixtures, not by clicking through setup). No test depends on another's side effects or ordering.
…
The line at the top of this page pins the label git:20260911.30a4306, 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 (4537 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
jdanigo/hydraia · 8 stars · license MIT · pushed 2026-09-24 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ufnjxlelvjodo4ec
GET https://markdownregistry.com/api/v1/resolve?ref=jdanigo/hydraia/e2e-testing
GET https://markdownregistry.com/api/v1/blob/4cce05eda718ca77315426ca4a4e89b034fcf34fa153590020b782923fc00d1c
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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Trigger when the user…
