# Testing · nxtg-ai

> 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", "how do I test X", when turning a hollow assertion into a real one, deciding what layer a test belongs in, or when a change must not drop test quality. The construction counterpart to the crucible-detective agent's fraud hunt.

## Facts
- Page: https://tashan.sh/capability/skill-nxtg-ai-testing
- tashan id: skill:nxtg-ai/testing
- Source: https://github.com/nxtg-ai/forge-plugin
- Type: skill
- Category: devtools
- tashan score: 48.0 / 100
- Adoption: 14.0
- Upkeep: 95.0
- Freshness: 90.0
- Evidence coverage: 84% of the inputs this score can use
- Health: active
- Instruction depth: not yet graded
- License: MIT
- Official: no

## Install

```sh
cp -r testing ~/.claude/skills/
```

## Security audit
Not scanned. We audit npm-published capabilities; this one has no npm package we can resolve, or has not reached the queue. This is not a clean bill of health.

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Measured 2026-08-25 by tashan (https://tashan.sh) from public evidence. Scorer s5.