testing

A workflow for writing, repairing, and reviewing tests in Bun projects. Tests are checks that verify code behaves as expected.

In plain words
What is it for?
Use it to add tests, fix flaky tests, set up coverage, and decide whether code needs unit or component tests.
Why use it?
It helps avoid incomplete tests, ineffective coverage settings, and assertions that appear to pass without actually waiting for failures.

Command

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.

agentmods
npx agentmods add commands/madappgang/magus/testing
Clone the repo
git clone --depth 1 https://github.com/MadAppGang/magus
Per session 23 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 288 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original 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 $0.00023 $0.00288
Opus 5 $0.00012 $0.00144
Sonnet 5 $0.00005 $0.00058
Haiku 4.5 $0.00002 $0.00029

Measured 2d ago against content hash 7337199c01f5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

testing 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 2d 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/bunjs/commands/testing.md · 23 lines

What it actually says

<user_request>$ARGUMENTS</user_request>

  1. Read skills/testing/SKILL.md in full first, resolved against this plugin's own directory (the tree this command was loaded from). It is the router: it names which files in skills/testing/references/ your task actually needs. Read those too before writing code.

Use this for writing tests, fixing failing or flaky tests, setting up coverage, or deciding what to test at which level.

  1. Copy skills/testing/assets/testing/ into the project for the component-test harness, fake upstream and builders. Prefer component tests over unit-mocking by default.
  2. Check the coverage gate actually gates. MEASURED: coverageThreshold = { line = 0.9 } is silently ignored — the keys are plural. Lower a threshold, confirm bun test exits 1, then restore it.
  3. Before reporting done: bun test green, tsc --noEmit clean, and every expect(...).rejects is awaited — without the outer await the assertion passes unconditionally.
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. 2d ago First seen · 23 lines · 23 tokens per session scan A 7337199c01f5

Subscribe to this mod's changes

testing is a command published in the GitHub repository MadAppGang/magus (9 stars, last pushed 3d ago), licensed MIT. It adds 23 tokens to every session and 288 once invoked, about $0.0001 per session on Opus 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 2026-08-31.