testing

A testing guide explains how to choose and write tests for software, including unit tests for small pieces and smoke tests for key real-world flows.

In plain words
What is it for?
Use it when adding features, fixing bugs, deciding what to test, or covering risky behavior such as data changes, synchronization, edge cases, and API compatibility.
Why use it?
It helps catch bugs before they return while avoiding tests that break during harmless code changes or merely repeat what a framework already guarantees.

Skill for Claude CodeCodex

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 skills/fthsrbst/mnema/testing
Any agent
npx skills add fthsrbst/mnema --skill testing
Clone the repo
git clone --depth 1 https://github.com/fthsrbst/mnema

Made for: Claude Code, Codex.

Per session 59 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 565 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 $0.00059 $0.00565
Opus 5 $0.00030 $0.00282
Sonnet 5 $0.00012 $0.00113
Haiku 4.5 $0.00006 $0.00056

Measured 2d ago against content hash f1f3cd689070, 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.

skills/testing/SKILL.md · 32 lines

What it actually says

Testing — Ne Zaman, Ne Kadar, Nasıl

Temel kurallar

  • Her bug düzeltmesi = önce onu yakalayan test. Test kırmızıyken düzelt, yeşile dön (bu repo'daki smoke pattern'i). Testsiz düzeltilen bug geri gelir.
  • Davranışı test et, implementasyonu değil: "fonksiyon X'i çağırıyor mu" değil, "girdi A → çıktı B mi". İç yapıya bağlı test, her refactor'da kırılan yüktür.
  • Test piramidi pragmatik: Bol hızlı birim testi çekirdek mantığa (chunker, arama, LWW merge gibi); az sayıda uçtan uca smoke gerçek akışa (kaydet→ara→bul). UI/entegrasyon testini gerçek fayda varsa yaz.

Neyi MUTLAKA test et

  • Para/veri kaybettirebilecek yollar: silme, senkron/merge, migration
  • Sınır koşulları: boş, null, unicode/Türkçe, eşzamanlılık, büyük girdi
  • Sözleşmeler: API response şekli, geriye dönük uyumluluk
  • Daha önce kırılmış her şey (regresyon)

Neyi test ETME

  • Framework'ün kendisini (express route'a istek atıp "çalışıyor mu" bakmak — bir smoke yeter)
  • Getter/setter, saf konfig, tek satırlık delegasyon
  • Mock'un mock'unu gerektiren şeyler — tasarım kokusudur; önce bağımlılığı ayrıştır

Pratik akış (yeni özellik)

  1. En riskli davranışı belirle → onun testini İLK yaz (kırmızı)
  2. Geçir (yeşil), sonra kenar durumları ekle
  3. Smoke'a bir uçtan uca satır ekle (gerçek akış hâlâ bütün mü?)
  4. CI yoksa bile: npm run smoke alışkanlığı — commit'ten önce çalıştır

Hata anatomisi

Test başarısız olduğunda mesaj üç soruyu cevaplamalı: ne bekleniyordu, ne geldi, hangi girdiyle. assert(x) değil assert.equal(sonuc, beklenen, "girdi: ...").

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 · 32 lines · 59 tokens per session scan A f1f3cd689070

Subscribe to this mod's changes

testing is a skill published in the GitHub repository fthsrbst/mnema (2 stars, last pushed 2d ago), licensed MIT. It adds 59 tokens to every session and 565 once invoked, about $0.0003 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.

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