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writing-good-tests

writing-good-tests is a skill for Claude Code from pbdeuchler/llm-plugins. It costs 25 tokens per session (2,850 once invoked), scanned A, original, no licence file.

A guide for writing and reviewing software tests.

In plain words
What is it for?
Use it when creating or reviewing automated tests.
Why use it?
It helps avoid unreliable tests by covering how tests wait for conditions, use mocks, and remain isolated from one another.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the house-style plugin — 9 skills shipped together

not rated 13repo 4mo ago A scan 25 tokens no licence

Good fit Use it when creating or reviewing automated tests.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/pbdeuchler/llm-plugins/writing-good-tests
View source ↗ pbdeuchler/llm-plugins
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add pbdeuchler/llm-plugins --skill writing-good-tests
Clone the repo
git clone --depth 1 https://github.com/pbdeuchler/llm-plugins

Made for: Claude Code.

Or install house-style, the plugin that ships this one along with the rest of its 9 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for writing-good-tests

README.md
[![agentmods](https://agentmods.dev/badge/skills/pbdeuchler/llm-plugins/writing-good-tests/github.svg)](https://agentmods.dev/skills/pbdeuchler/llm-plugins/writing-good-tests)
Your own site
<a href="https://agentmods.dev/skills/pbdeuchler/llm-plugins/writing-good-tests"><img src="https://agentmods.dev/badge/skills/pbdeuchler/llm-plugins/writing-good-tests/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for writing-good-tests

Your own site · 80×15
<a href="https://agentmods.dev/skills/pbdeuchler/llm-plugins/writing-good-tests"><img src="https://agentmods.dev/badge/skills/pbdeuchler/llm-plugins/writing-good-tests.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 25 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,850 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00025 $0.02850
Opus 5.5 $0.00010 $0.01140
Sonnet 5.5 $0.00005 $0.00570
Haiku 4.5 $0.00003 $0.00285

Measured 2mo ago against content hash 08d0bfe9ff87, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

writing-good-tests scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/house-style/skills/writing-good-tests/SKILL.md · 416 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 416 lines · 25 tokens per session scan A 08d0bfe9ff87

Subscribe to this mod's changes

writing-good-tests is a skill published in the GitHub repository pbdeuchler/llm-plugins (13 stars, last pushed 4mo ago), with no licence file. It adds 25 tokens to every session and 2,850 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Testing
Related

writing-good-tests compared with skills from other repositories

writing-good-tests next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
writing-good-testspbdeuchler/llm-pluginsSkill134mo agononeA25Claude Code
imagegenopenai/codexSkill133kyesterdayApache-2.0A113Codex
playwright-climicrosoft/playwrightSkill99kyesterdayApache-2.0A19Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79k4d agoMITA200Claude Code, Codex
systematic-debuggingobra/superpowersSkill313k3d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143kyesterdayMITA95Claude Code
next-partial-prefetching-adoptionvercel/next.jsSkill143kyesterdayMITA103Claude Code