Testing SKILL.md skillA

Testing from nxtg-ai/forge-plugin is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add nxtg-ai/forge-plugin/Testing@git:20260715.857b62e

Pins git:20260715.857b62e in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: nxtg-ai/forge-plugin
Path: plugins/nxtg-forge/skills/testing/SKILL.md
Versions recorded: 3
Latest version: git:20260715.857b62e, committed Jul 15, 2026
First version recorded: Feb 7, 2026
Size: 11,566 bytes
Repository stars: 6
License: MIT

How to WRITE real, maintainable tests in any stack — assertions that fail when the code is broken, the test pyramid and AAA structure, behavior-over-implementation, mocking discipline, fixtures, coverage that means something, and the ship gates (test-count-never-decrease, no self-mocking, prove-RED-first). Language-generic with concrete examples in TypeScript/JavaScript, Python, Rust, and Go. Use when asked to "add tests", "write a test", "improve coverage", "fix a flaky test…

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 — Writing Tests That Catch Real Bugs

A test that stays green while the code is broken is **worse than no test** — it
manufactures false confidence. This skill is the *construction* companion to the
crucible-detective agent:

- **crucible-audit** skill — *detection*: the 8 fraud patterns (hollow assertions,
  mock proliferation, dead tests, coverage-config lies) + the language matrix.
- **testing** (this skill) — *construction*: principles + how to write a test that
  actually fails on a real bug, in whatever stack the project uses.

Guidance is language-generic; examples cover the stacks Forge users build in —
TypeScript/JavaScript, Python, Rust, Go. Match the project before you copy a snippet.

## The one rule that makes a test real

Every test must **fail when you break the thing it names.** Before you trust a new
test, prove it: change the production code to be wrong, re-run, confirm **RED**, then
revert. An assertion that survives a deliberately broken implementation is theater.

```js
// THEATER — passes even if computeDiscount() returns garbage
expect(result).toBeDefined();
expect(result.total).toBeTruthy();
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add nxtg-ai/forge-plugin/Testing@sha256:ca362aaad089ccaa

The line at the top of this page pins the label git:20260715.857b62e, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_6q3hrbkgr3w7tgrm.svg)](https://markdownregistry.com/a/art_6q3hrbkgr3w7tgrm)

3 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 3 versions of this file, between Feb 7, 2026 and Jul 15, 2026, about one every 79 days.

version	committed	commit	size	audit
git:20260715.857b62e latest	2026-07-15	857b62e	11,566 B	A	view · diff
git:20260714.4fd0952	2026-07-14	4fd0952	6,963 B	A	view · diff
git:20260207.88c1f6e	2026-02-07	88c1f6e	2,392 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (11566 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

GitHub

nxtg-ai/forge-plugin · 6 stars · license MIT · pushed 2026-10-15 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_6q3hrbkgr3w7tgrm
GET https://markdownregistry.com/api/v1/resolve?ref=nxtg-ai/forge-plugin/Testing
GET https://markdownregistry.com/api/v1/blob/ca362aaad089ccaa937479e7bfb0a71be7d8961526db8ac8cff25914cfbc450c

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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