testing-codegen SKILL.md skillA
testing-codegen from modem-dev/ossrules is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add modem-dev/ossrules/testing-codegen@git:20260917.a2709ecPins git:20260917.a2709ec in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- modem-dev/ossrules
- Path
public/files/biomejs/.claude/skills/testing-codegen/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260917.a2709ec, committed Sep 17, 2026
- Size
- 5,160 bytes
- Repository stars
- 65
- License
- MIT
Use this skill when selecting or running Biome test fixtures, quick tests, `insta` snapshot workflows, expectation comments, orphan checks, or required code generators. Do not use for subsystem implementation design.
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
# Testing and Code Generation Choose the narrowest test that exercises the changed behavior, then broaden only when shared infrastructure or integration risk justifies it. ## Test Selection | Change | Start with | | --- | --- | | Lint rule | `just test-lintrule <ruleName>` | | One crate | `cargo test -p <crate>` or the crate's focused test target | | Parser or formatter investigation | `just qt <package>` | | CLI migration | focused `biome_cli` migration tests | | Documentation code | `just test-doc` | Use `-- --show-output` or `--nocapture` only when the test's diagnostic output is needed. Quick tests are scratch space for inspecting CST, formatter IR, or one analyzer query. Persistent behavior belongs in the subsystem's normal fixture directory before finishing. ## Snapshot Workflow Run the focused test to produce snapshots, then review every changed section: ```shell cargo insta review ``` Use `cargo insta accept` or `cargo insta reject` only after inspecting the pending changes. A passing snapshot test proves output matches the checked-in snapshot, not that the snapshot describes correct behavior. ### Orphaned Snapshots …
Read the whole file at its exact version.
How to install
mdr add modem-dev/ossrules/testing-codegen@sha256:f15a331e9c73223bThe line at the top of this page pins the label git:20260917.a2709ec, 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_3iz5q74edolou73p)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Sep 17, 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 (5160 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
modem-dev/ossrules · 65 stars · license MIT · pushed 2026-09-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_3iz5q74edolou73p GET https://markdownregistry.com/api/v1/resolve?ref=modem-dev/ossrules/testing-codegen GET https://markdownregistry.com/api/v1/blob/f15a331e9c73223b4e2e3f3f7d5fce47daedd58e7fd75b37317d5722c747685b
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.