testing

A set of testing rules for a monorepo—a repository containing multiple related packages or projects—using Bun’s test runner.

In plain words
What is it for?
Use it when writing or reviewing unit and integration tests, especially tests using bun:test, HappyDOM, Testing Library, or mocked boundaries such as networks and databases.
Why use it?
It standardizes test names, structure, mocks, file placement, and quality checks so tests remain readable and reliable.

Cursor rule for Cursor

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 rules/movahedan/monobun/testing
Clone the repo
git clone --depth 1 https://github.com/movahedan/monobun

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 367 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 $0.00000 $0.00367
Opus 5 $0.00000 $0.00183
Sonnet 5 $0.00000 $0.00073
Haiku 4.5 $0.00000 $0.00037

Measured 2d ago against content hash 259ea034716f, 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.

.cursor/rules/testing.mdc · 41 lines

What it actually says

Testing

Stack (configured — do not restate)

Naming and structure

  • describe('<module> - <unit>', () => {})
  • it('<expected outcome> when <condition>', () => {})
  • No inline comments or JSDoc in tests; names document behavior
  • AAA layout; blank line between logical groups inside a test

Quality bar

  • Assert observable behavior, not internals
  • One failure reason per test; no flakiness (mock time/network/random)
  • Mock boundaries only (network, DB, fs, env) — not pure logic
  • Restore spies; preset handles most cleanup

File placement

  • Unit: src/<area>/<thing>.test.ts or src/__tests__/
  • Integration: src/__tests__/<thing>.integration.test.ts

Patterns

  • Table-driven cases via cases.forEach or test.each (Bun: test.each / describe.each, not it.each)

Commands

See docs/CHEATSHEET.mdbun test, bun run overall.

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 · 41 lines · 367 tokens per session scan A 259ea034716f

Subscribe to this mod's changes

testing is a cursor rule published in the GitHub repository movahedan/monobun (18 stars, last pushed 4d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 367 tokens. 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.