testing-principles SKILL.md skillA
testing-principles from shinpr/claude-code-workflows is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add shinpr/claude-code-workflows/testing-principles@git:20261019.4d66b0cPins git:20261019.4d66b0c in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- shinpr/claude-code-workflows
- Path
dev-workflows-frontend/skills/testing-principles/SKILL.md- Versions recorded
- 7
- Latest version
- git:20261019.4d66b0c, committed Oct 19, 2026
- First version recorded
- Jul 27, 2026
- Size
- 5,827 bytes
- Repository stars
- 707
- License
- MIT
Language-agnostic testing principles for choosing which tests a change needs, test quality, and proof ownership, with frontend and browser E2E implementation references. Use when writing tests, deciding test scope, or reviewing test quality.
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
# Language-Agnostic Testing Principles Tests here guarantee accepted behavior, and the next agent reads every existing test as a requirement to preserve. A brittle, duplicated, or implementation-shaped test therefore becomes a false requirement: it gets worked around, and the workaround leaves debt in the implementation. Keep the set of tests whose proof is worth its maintenance. ## Test Selection - Prove accepted behavior by default through integration and E2E tests at the boundary users and callers observe. Add a unit test for logic whose cases one representative boundary test cannot prove, such as calculations, parsing, or branching rules. - Each behavioral claim is owned by one test: such logic by its unit test, other behavior by the test at the narrowest integration or E2E boundary where it is observable. A test at a wider boundary or in a variant (viewport, device, role) proves what that boundary or variant adds, such as wiring, mapping, persistence, rendering, or navigation, and keeps at most one representative case of a rule owned elsewhere. …
Read the whole file at its exact version.
How to install
mdr add shinpr/claude-code-workflows/testing-principles@sha256:6edf8ef18f2eb12eThe line at the top of this page pins the label git:20261019.4d66b0c, 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_3a2l7zjticv6htfb)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 7 versions of this file, between Jul 27, 2026 and Oct 19, 2026, about one every 14 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261019.4d66b0c latest | 2026-10-19 | 4d66b0c | 5,827 B | A | view · diff |
| git:20261013.5482041 | 2026-10-13 | 5482041 | 5,146 B | A | view · diff |
| git:20260809.6130272 | 2026-08-09 | 6130272 | 4,554 B | A | view · diff |
| git:20260806.d8a29d4 | 2026-08-06 | d8a29d4 | 4,608 B | A | view · diff |
| git:20260728.e9e235b | 2026-07-28 | e9e235b | 4,529 B | A | view · diff |
| git:20260728.aeb22be | 2026-07-28 | aeb22be | 13,310 B | A | view · diff |
| git:20260727.b2c46ee | 2026-07-27 | b2c46ee | 13,422 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 (5827 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
shinpr/claude-code-workflows · 707 stars · license MIT · pushed 2026-10-29 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_3a2l7zjticv6htfb GET https://markdownregistry.com/api/v1/resolve?ref=shinpr/claude-code-workflows/testing-principles GET https://markdownregistry.com/api/v1/blob/6edf8ef18f2eb12eba1dd300bc201d8b83d7871fddeeb89fb350bff039b608ff
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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