testing

A rule requiring at least one unit test for every non-trivial feature, using pytest. Unit tests check small pieces of code in isolation.

In plain words
What is it for?
Testing functions with decisions, formulas, or store changes, including reference tests for results that can be calculated by hand.
Why use it?
It catches incorrect calculations, branching behavior, and side effects before changes are committed.

Cursor rule for Codex

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/ralfhuesing/computetoai/testing
Clone the repo
git clone --depth 1 https://github.com/RalfHuesing/ComputeToAi

Made for: Codex.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 263 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 $0.00263
Opus 5 $0.00000 $0.00131
Sonnet 5 $0.00000 $0.00053
Haiku 4.5 $0.00000 $0.00026

Measured yesterday against content hash 27d747b5c8ff, 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 yesterday.

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.

.agents/rules/testing.mdc · 18 lines

What it actually says

Testpflicht

Jedes nicht-triviale Feature (jede Funktion mit einer Fallunterscheidung, einer Formel oder einem Seiteneffekt auf einen Store) bekommt mindestens einen Unit-Test. Trivial – und damit ohne eigenen Test zulässig – sind reine Datencontainer ohne Logik und einfache Weiterleitungen ohne eigene Berechnung.

  • Framework: pytest.
  • Ein Testmodul je Quellmodul (tests/test_engine/test_store.py für src/compute_to_ai/engine/store.py), Teststruktur spiegelt Codestruktur.
  • Golden-/Referenztests für alles mit einem von Hand nachrechenbaren Ergebnis – der wichtigste Baustein für Vertrauen in größtenteils agentisch gebauten Code.
  • Kein hartes Coverage-Ziel in Prozent – die Regel ist qualitativ, nicht ein Prozentwert.
  • Ein Agent committet keine Änderung an src/, für die die vorgeschriebenen Tests fehlen oder rot sind (siehe git-workflow.mdc).

Details/Begründung: Docs/11-Code-Standards-und-Projektstruktur.md.

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. yesterday First seen · 18 lines · 0 tokens per session scan A 27d747b5c8ff

Subscribe to this mod's changes

testing is a cursor rule published in the GitHub repository RalfHuesing/ComputeToAi (0 stars, last pushed 1mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 263 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 2026-08-31.