Home / wst2002 / claude-code-skills · GitHub

test-writer SKILL.md skillA

test-writer from wst2002/claude-code-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add wst2002/claude-code-skills/test-writer@git:20261016.55bd98a

Pins git:20261016.55bd98a in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: wst2002/claude-code-skills
Path: skills/test-writer/SKILL.md
Versions recorded: 2
Latest version: git:20261016.55bd98a, committed Oct 16, 2026
First version recorded: Oct 16, 2026
Size: 2,963 bytes
Repository stars: 3
License: MIT

Use when asked to write tests, add unit or integration tests, increase test coverage, test existing untested code, or cover a bug fix with a regression test — Jest, Vitest, pytest, JUnit, Go test, Playwright and others.

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 Writer

## Overview

Write tests that would fail if the behavior broke. Match the project's existing test framework and style, test behavior through public interfaces, and run every test you write.

## Method

1. **Learn the project's testing setup:** framework and runner (from config and `package.json`/`pyproject.toml`/`pom.xml`), where tests live, naming, helpers, fixtures, factories. Read two existing tests and copy their style. If there are no tests, pick the standard for the stack and say so.
2. **Decide what to test** for the target code:
   - Main success path.
   - Each branch and error path.
   - Boundaries: empty, zero, one, many, max, null/undefined, invalid types, unicode, time zones.
   - Contracts other code depends on (return shape, thrown errors, emitted events).
3. **Choose the level:** unit for pure logic, integration where the risk is in wiring (database, HTTP, queues), end-to-end only for critical user journeys.
4. **Write each test** as Arrange / Act / Assert with one behavior per test and a name that states it: `returns 0 when the cart is empty`.
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add wst2002/claude-code-skills/test-writer@sha256:c7eb0ba48b6f379f

The line at the top of this page pins the label git:20261016.55bd98a, 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_qdpcahesakkw37wg.svg)](https://markdownregistry.com/a/art_qdpcahesakkw37wg)

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

Versions

The registry has recorded 2 versions of this file, all committed on Oct 16, 2026.

version	committed	commit	size	audit
git:20261016.55bd98a latest	2026-10-16	55bd98a	2,963 B	A	view · diff
git:20261016.bf68d6a	2026-10-16	bf68d6a	2,761 B	A	view

Audit of the latest version

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 (2963 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

wst2002/claude-code-skills · 3 stars · license MIT · pushed 2026-10-19 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_qdpcahesakkw37wg
GET https://markdownregistry.com/api/v1/resolve?ref=wst2002/claude-code-skills/test-writer
GET https://markdownregistry.com/api/v1/blob/c7eb0ba48b6f379f429f7bd6ed729982a96e1ce4e0e67a6743e2d07c73abb2c3

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: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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