test-driven-development-practices

test-driven-development-practices is a cursor rule for Cursor from Stramp/Lost-Mines-Phandelver. It costs 2,049 tokens per session, scanned A, original, MIT.

A practical Test-Driven Development (TDD) checklist and set of examples. TDD means writing a failing test before implementing the code it checks.

In plain words
What is it for?
It guides checking test behavior, test isolation, hardcoded expected values, minimal implementations, and the Red-Green-Refactor workflow.
Why use it?
It helps prevent incomplete, unclear, or ineffective tests and encourages small, testable implementations followed by safe refactoring.

Cursor rule for Cursor

Written for Cursor: installed under .cursor/.

Good fit It guides checking test behavior, test isolation, hardcoded expected values, minimal implementations, and the Red-Green-Refactor workflow.

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Install with agentmods
npx agentmods add rules/stramp/lost-mines-phandelver/test-driven-development-practices
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.

Clone the repo
git clone --depth 1 https://github.com/Stramp/Lost-Mines-Phandelver

Made for: Cursor.

Wrote this? Show the measurements

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README.md
[![agentmods](https://agentmods.dev/badge/rules/stramp/lost-mines-phandelver/test-driven-development-practices/github.svg)](https://agentmods.dev/rules/stramp/lost-mines-phandelver/test-driven-development-practices)
Your own site
<a href="https://agentmods.dev/rules/stramp/lost-mines-phandelver/test-driven-development-practices"><img src="https://agentmods.dev/badge/rules/stramp/lost-mines-phandelver/test-driven-development-practices/github.svg" alt="Measured on agentmods" height="20"></a>

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Your own site · 80×15
<a href="https://agentmods.dev/rules/stramp/lost-mines-phandelver/test-driven-development-practices"><img src="https://agentmods.dev/badge/rules/stramp/lost-mines-phandelver/test-driven-development-practices.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 2,049 This file is loaded in full into every session.
When invoked 2,049 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.02049 $0.02049
Opus 5.5 $0.00820 $0.00820
Sonnet 5.5 $0.00410 $0.00410
Haiku 4.5 $0.00205 $0.00205

Measured 1mo ago against content hash 360ba65c5028, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

test-driven-development-practices 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 1mo 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/test-driven-development-practices.mdc · 252 lines

How it starts

The opening of the file, as written. The whole thing — 252 lines — stays where its author put it; the contents beside it link to each section on GitHub.

🧪 Test-Driven Development (TDD) - Practices

📋 Checklist TDD Obrigatório

BEFORE escrever QUALQUER código crítico, SEMPRE verificar:

  1. [ ] Escrevi o teste que falha (Red)?

    • Teste define comportamento esperado?
    • Teste pode detectar erros?
    • Teste compila (mesmo que função não exista ainda)?
  2. [ ] O teste é atômico e focado?

    • Testa uma única coisa?
    • Nome descritivo (<Scenario>_<Condition>_<ExpectedResult>)?
    • Independente de outros testes?
  3. [ ] O teste NÃO tem lógica interna?

    • Valor esperado é hardcoded (não calculado)?
    • Teste chama a função real do módulo oficial?
    • Mock apenas simula dados (não implementa lógica)?
    • Teste falharia se o código estivesse errado?
    • Não há lógica de cálculo no teste?
  4. [ ] A função será testável isoladamente?

    • Sem dependências ocultas?
    • Parâmetros claros?
    • Retorno verificável?
  5. [ ] Implementação mínima faz teste passar (Green)?

    • Solução mais simples possível?
    • Teste fica verde?
    • Comportamento básico funciona?
  6. [ ] Refatorei com segurança (Refactor)?

    • Testes ainda passam?
    • Código melhorado sem quebrar comportamento?
    • Clean Code aplicado?

Se QUALQUER resposta for NÃO → PARAR e corrigir antes de continuar

⚠️ Exceções: Quando Test-After é Aceitável

Test-After (escrever teste depois) é aceitável quando:

  • ❌ Getters/Setters simples (sem lógica)

    // Não precisa de teste primeiro
    float GetHealth() const { return Health; }
    void SetHealth(float NewHealth) { Health = NewHealth; }
    
  • ❌ Wrappers diretos de API Unreal (sem lógica customizada)

    // Wrapper simples, testar depois se necessário
    UDataTable* GetRaceDataTable() const { return RaceDataTable; }
    
  • ❌ Integração com Blueprint (testar depois pode ser mais prático)

    // Integração complexa, testar depois
    UFUNCTION(BlueprintCallable)
    void InitializeFromBlueprint(UCharacterSheetDataAsset* Asset);
    

Read the full file on GitHub · 252 lines

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. 1mo ago First seen · 252 lines · 2,049 tokens per session scan A 360ba65c5028

Subscribe to this mod's changes

test-driven-development-practices is a cursor rule published in the GitHub repository Stramp/Lost-Mines-Phandelver (2 stars, last pushed 10mo ago), licensed MIT. It adds 2,049 tokens to every session, about $0.0082 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 2026-08-31.