writing-tests SKILL.md skillA
writing-tests from ahgraber/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ahgraber/skills/writing-tests@git:20260819.209d97bPins git:20260819.209d97b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ahgraber/skills
- Path
skills/writing-tests/SKILL.md- Versions recorded
- 4
- Latest version
- git:20260819.209d97b, committed Aug 19, 2026
- First version recorded
- May 14, 2026
- Size
- 12,994 bytes
- Repository stars
- 6
- License
- CC0-1.0
Use when writing or reviewing tests in any language, or diagnosing a suite that is slow, brittle, or hard to read. Triggers: "write tests", "how should I test this", "what kind of test", "test is flaky/fragile", "should I mock this", "test is hard to read". Python-specific practices (mocking, pytest, async) are included in `references/python-testing.md`.
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
# Writing Tests ## When to Use - Writing or reviewing tests in any language or framework. - Choosing what kind of test to write (unit, integration, E2E). - Diagnosing a suite that is slow, brittle, flaky, or hard to maintain. - Reviewing test structure, naming, or test double usage. - Unsure what test coverage a change needs. ## When NOT to use - Auditing Python code for house-style violations outside tests: see the `python` skill. ## Invocation Notice - Tell the user when this skill is running: `writing-tests`. Skip the notice when the user asked for the skill by name or slash command; spelling and spacing need not match. A phrase from this skill's own trigger list is not a name — naming the work is not naming the skill. ## Quick Reference - Test observable behavior — outputs, state transitions, emitted effects — not implementation internals. - One behavior per test. Split when you can't write a single coherent name covering all assertions. - Write the regression test before the fix; a test you never saw fail proves nothing. - Keep tests order-independent and deterministic. Inject clocks and randomness; never sleep. …
Read the whole file at its exact version.
How to install
mdr add ahgraber/skills/writing-tests@sha256:8bf26ec0aab3d011The line at the top of this page pins the label git:20260819.209d97b, 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.
[](https://markdownregistry.com/a/art_6hk3gdvdedbo5z5d)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between May 14, 2026 and Aug 19, 2026, about one every 33 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260819.209d97b latest | 2026-08-19 | 209d97b | 12,994 B | A | view · diff |
| git:20260819.e83ef88 | 2026-08-19 | e83ef88 | 12,788 B | A | view · diff |
| git:20260728.79ff2f8 | 2026-07-28 | 79ff2f8 | 12,109 B | A | view · diff |
| git:20260514.4293de9 | 2026-05-14 | 4293de9 | 12,117 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (12994 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
ahgraber/skills · 6 stars · license CC0-1.0 · pushed 2026-10-29 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_6hk3gdvdedbo5z5d GET https://markdownregistry.com/api/v1/resolve?ref=ahgraber/skills/writing-tests GET https://markdownregistry.com/api/v1/blob/8bf26ec0aab3d011f4b8d7ea8331f5fede51c6a7047f3744b6937ff11294d251
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.