tests-that-respect-boundaries SKILL.md skillB
tests-that-respect-boundaries from chrisreddington/flight-school is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add chrisreddington/flight-school/tests-that-respect-boundaries@git:20260526.7b314d2Pins git:20260526.7b314d2 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- chrisreddington/flight-school
- Path
.github/skills/tests-that-respect-boundaries/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260526.7b314d2, committed May 26, 2026
- First version recorded
- May 24, 2026
- Size
- 10,115 bytes
- Repository stars
- 30
- License
- MIT
Use whenever you are writing, reviewing, or refactoring tests in this repo. Enforces the project's contract that tests assert observable behaviour, mock only at system seams, stay small and table-driven, and never drift into "did the mock get called" territory. Trigger phrases: "write tests for", "add a test", "fix this test", "are these tests testing the right thing?", "review my 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
# Tests that respect boundaries ## Why this skill exists In this repo, tests are starting to drift past their own boundaries: hook tests that assert on `expect(mocks.someStore).toHaveBeenCalledWith(...)` instead of asserting on `result.current`; storage tests that re-verify what the persistence layer already proves; multi-hundred-line files that prove the same behaviour six different ways. Each one of those is a test that locks in the *implementation* — so harmless refactors break tests and the suite stops being a safety net and starts being a tax. This skill is the practical contract: **one module, one test file, observable assertions, system-seam mocks, table-driven cases, hard size caps**. It supplements the rules in [`.github/instructions/testing.instructions.md`](../../instructions/testing.instructions.md) and the TDD discipline in [`tdd/SKILL.md`](../tdd/SKILL.md) — it does not replace them. ## The contract ### 1. Test the unit, not the mock …
Read the whole file at its exact version.
How to install
mdr add chrisreddington/flight-school/tests-that-respect-boundaries@sha256:5c603ca50f4b1d08The line at the top of this page pins the label git:20260526.7b314d2, 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_w7dtbskx3wlvnm45)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between May 24, 2026 and May 26, 2026, about one every 2 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260526.7b314d2 latest | 2026-05-26 | 7b314d2 | 10,115 B | B | view · diff |
| git:20260524.78cd692 | 2026-05-24 | 78cd692 | 9,974 B | B | view |
Audit of the latest version
- fail: Frontmatter declares a name
- pass: Frontmatter block present
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (10115 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
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
chrisreddington/flight-school · 30 stars · license MIT · pushed 2026-10-17 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_w7dtbskx3wlvnm45 GET https://markdownregistry.com/api/v1/resolve?ref=chrisreddington/flight-school/tests-that-respect-boundaries GET https://markdownregistry.com/api/v1/blob/5c603ca50f4b1d08b8989317bc8fd0d8def4902aa0dccdd9176edbc1a0e66be6
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.