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testing Cursor ruleA

testing from darknecrocities/skillbuilder is a Cursor rule: instructions the Cursor agent follows in that repo.

Install it, pinned

mdr add darknecrocities/skillbuilder/.cursor/rules/testing.mdc@git:20261029.1aa6bef

Pins git:20261029.1aa6bef in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 14 of 14 checks passed
Kind: Cursor rule
Repository: darknecrocities/skillbuilder
Path: .cursor/rules/testing.mdc
Versions recorded: 1
Latest version: git:20261029.1aa6bef, committed Oct 29, 2026
Size: 5,125 bytes
Repository stars: 13
License: none declared

Test-Driven Development (TDD) discipline, Vitest, Jest, Playwright E2E with accessible locators, MSW contract tests, and mutation testing principles.

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

# Test-Driven Discipline, Playwright E2E & Mutation QA (`/testing`)

> **Philosophy**: *Untested code is broken by design. Write failing characterization tests before refactoring. Ban fragile CSS selectors in E2E tests—use accessible roles and semantic labels. Ban hardcoded sleep timers—use auto-waiting web-first assertions. Aim for 80%+ line and branch coverage.*

This skill establishes automated testing discipline across **Vitest**, **Jest**, **Playwright**, **Cypress**, and **Mock Service Worker (MSW)**.

---

## 1. Quick Navigation & Progressive Disclosure

| Resource Type | Document | Description |
| :--- | :--- | :--- |
| **Reference** | [references/playwright-accessible-locators.md](references/playwright-accessible-locators.md) | Accessible locator hierarchy, web-first assertions, zero sleep timeouts. |
| **Reference** | [references/tdd-and-msw-contracts.md](references/tdd-and-msw-contracts.md) | Red-Green-Refactor cycle, MSW network interception handlers, fixture isolation. |
| **Utility** | [scripts/verify_testing_hygiene.py](scripts/verify_testing_hygiene.py) | Audits tests for brittle XPath/class selectors, hardcoded sleep calls, and unisolated state. |

---
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add darknecrocities/skillbuilder/.cursor/rules/testing.mdc@sha256:235ec247df4601d0

The line at the top of this page pins the label git:20261029.1aa6bef, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_5wcghepmigz4v6nt.svg)](https://markdownregistry.com/a/art_5wcghepmigz4v6nt)

0 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on Oct 29, 2026.

version	committed	commit	size	audit
git:20261029.1aa6bef latest	2026-10-29	1aa6bef	5,125 B	A	view

Audit of the latest version

A 14 of 14 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Size between 200 bytes and 200 KB (5125 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

darknecrocities/skillbuilder · 13 stars · license none declared · pushed 2026-10-29 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_5wcghepmigz4v6nt
GET https://markdownregistry.com/api/v1/resolve?ref=darknecrocities/skillbuilder/.cursor/rules/testing.mdc
GET https://markdownregistry.com/api/v1/blob/235ec247df4601d08dcef98462ff147936e9b7fd9f04fd66adb3f3c66227c0df

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.

Guides: Cursor rules vs AGENTS.md · which agent file does what.

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