rust-testing SKILL.md skillA
rust-testing from xobotyi/cc-foundry is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add xobotyi/cc-foundry/rust-testing@git:20260602.ee85528Pins git:20260602.ee85528 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- xobotyi/cc-foundry
- Path
plugins/rust/skills/rust-testing/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260602.ee85528, committed Jun 2, 2026
- Size
- 9,979 bytes
- Repository stars
- 23
- License
- MIT
Rust testing conventions and frameworks: built-in #[test], integration, and doctest layout plus the cargo-nextest runner and the proptest, insta, criterion, mockall, and rstest ecosystem. Invoke whenever task involves any interaction with Rust tests — writing, running, configuring, or debugging tests in .rs files and Cargo projects.
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
# Rust Testing
Prefer real implementations and hand-written fakes over heavy mocking — a test wired to a mock asserts how the code
calls its collaborators, not what the code does. Tests are documentation that runs: a reader should learn the intended
behavior from the test name, the arrange/act/assert shape, and the doctest examples on public items. Test the public
contract, not the private call graph.
## Route to Reference
- **Test layout depth** — `${CLAUDE_SKILL_DIR}/references/layout.md` Unit vs integration vs doctest mechanics, `tests/`
crate-per-file model, `tests/common/mod.rs` shared-helper pattern, binary-crate `lib.rs` split, doctest attributes
(`no_run`, `should_panic`, `ignore`, hidden `#` lines), `assert_matches!` and `pretty_assertions` usage
- **Property and snapshot testing, benchmarks** — `${CLAUDE_SKILL_DIR}/references/property-and-snapshot.md` proptest vs
quickcheck strategy authoring and shrinking, insta inline/file snapshots and `cargo insta review`, criterion harness
setup and `std::hint::black_box`
- **Mocking and fixtures** — `${CLAUDE_SKILL_DIR}/references/mocking-and-fixtures.md` mockall `#[automock]` vs `mock!`,
…Read the whole file at its exact version.
How to install
mdr add xobotyi/cc-foundry/rust-testing@sha256:2e4d27bd2d9c9e25The line at the top of this page pins the label git:20260602.ee85528, 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_7ijf7ehmrdkf5brs)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Jun 2, 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 (9979 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
xobotyi/cc-foundry · 23 stars · license MIT · pushed 2026-11-06 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_7ijf7ehmrdkf5brs GET https://markdownregistry.com/api/v1/resolve?ref=xobotyi/cc-foundry/rust-testing GET https://markdownregistry.com/api/v1/blob/2e4d27bd2d9c9e252c9efdce74c0dcb84a0e476776a2de808183b27cc20e5d36
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.
More from xobotyi/cc-foundry
Every file in xobotyi/cc-foundry