miri-testing SKILL.md skillA
miri-testing from miri-lang/miri is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add miri-lang/miri/miri-testing@git:20260909.7d62122Pins git:20260909.7d62122 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- miri-lang/miri
- Path
skills/miri-testing/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260909.7d62122, committed Sep 9, 2026
- First version recorded
- Aug 29, 2026
- Size
- 5,256 bytes
- Repository stars
- 16
- License
- Apache-2.0
Writing Miri tests — miri test runner, test attributes, and assertion functions.
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 in Miri
Miri includes a built-in test runner and assertion library. This skill teaches how to write tests, run them, and understand test attributes.
## Writing and Running Tests
### Basic Test
Mark a function with `@test` to make it a test case:
```miri
use system.testing.{assert_eq}
@test fn simple_add()
assert_eq(2 + 2, 4)
```
Run tests with the `miri test` command:
```bash
miri test --dir <directory>
```
The runner discovers all `.mi` files, finds functions marked with `@test`, and executes them.
### Assertion Functions
Miri provides four assertion functions (all require an import):
```miri
use system.testing.{assert, assert_eq, assert_ne, assert_panics}
@test fn test_assert()
assert(true)
@test fn test_equals()
assert_eq(5, 5)
@test fn test_not_equals()
assert_ne(3, 4)
@test fn test_panic()
assert_panics(fn(): panic("expected error"))
```
All assertions accept an optional message argument.
### Test Runner Options
```bash
miri test --dir <DIR> # Run tests in directory
miri test --filter <PATTERN> # Run tests matching pattern
miri test --format pretty|json # Output format
miri test -v # Verbose
…Read the whole file at its exact version.
How to install
mdr add miri-lang/miri/miri-testing@sha256:af767e5b3c158866The line at the top of this page pins the label git:20260909.7d62122, 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_u6p4n3665dayio2n)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Aug 29, 2026 and Sep 9, 2026, about one every 6 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260909.7d62122 latest | 2026-09-09 | 7d62122 | 5,256 B | A | view · diff |
| git:20260901.545b9b0 | 2026-09-01 | 545b9b0 | 4,723 B | A | view · diff |
| git:20260829.6018a27 | 2026-08-29 | 6018a27 | 3,355 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 (5256 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
miri-lang/miri · 16 stars · license Apache-2.0 · pushed 2026-11-07 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_u6p4n3665dayio2n GET https://markdownregistry.com/api/v1/resolve?ref=miri-lang/miri/miri-testing GET https://markdownregistry.com/api/v1/blob/af767e5b3c1588662671c600707c20db5376ee97b00e0ef49268d7c7b420304b
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.