tdd-best-practices SKILL.md skillA
tdd-best-practices from okhp3/skillz is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add okhp3/skillz/tdd-best-practices@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- okhp3/skillz
- Path
community/tdd-best-practices/SKILL.md- Versions recorded
- 1
- Latest version
- v1.0.0, committed Aug 28, 2026
- Size
- 9,828 bytes
- Repository stars
- 3
- License
- MIT
Test-Driven Development guidance. Use when writing tests before implementation, applying Red-Green-Refactor, testing Value Object contracts, typed domain failures/Results, DDD Aggregates, Domain Events/subscribers, transaction or cache boundaries, data migrations/backfills, Criteria/query adapters, repository contracts or persistence adapters, choosing between test doubles, deciding test granularity, reviewing test suite quality, or diagnosing brittle tests.
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
# TDD Best Practices Use this skill when the main question is how to drive implementation from tests, how to structure a test suite, or how to recover discipline in a codebase where tests were written after the fact. ## Working Style 1. Write one failing test, then make it pass with the minimum code needed. 2. Refactor only when all tests are green. 3. Test behaviors, not implementations — the public API, not private methods. 4. Keep tests as simple as the production code they verify. 5. A test suite that is hard to change is as expensive as production code that is hard to change. ## The Red-Green-Refactor Cycle ``` RED → Write a failing test that describes the next behavior. GREEN → Write the minimum code to make it pass. REFACTOR → Clean up both the code and the test — no new behavior. ``` The discipline is in the order. Never refactor on Red. On Green, add only the behavior demanded by the current failing test. ### The 3 Laws (Uncle Bob) 1. You may not write production code unless you have a failing unit test. …
Read the whole file at its exact version.
How to install
mdr add okhp3/skillz/tdd-best-practices@sha256:dc2804a692200c46The line at the top of this page pins the label v1.0.0, 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_oj5nenhfekj6hoin)
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Versions
The registry has recorded 1 version of this file, committed on Aug 28, 2026.
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 (9828 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
okhp3/skillz · 3 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_oj5nenhfekj6hoin GET https://markdownregistry.com/api/v1/resolve?ref=okhp3/skillz/tdd-best-practices GET https://markdownregistry.com/api/v1/blob/dc2804a692200c4693e9535a3e79eccbe8a8d3edd87c1979d43dcc2bacb2b5e5
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.