test-first-prompting

name	test-first-prompting
description	Test-first prompting workflow for this booking system. Use when the user asks AI to first derive failure, race, duplicate, overload, Redis outage, payment failure, or retry-storm scenarios before implementation, and to pin those scenarios as tests before writing production code.
triggers	["test-first prompting","테스트 먼저","테스트로 고정","장애 시나리오 먼저","경쟁 시나리오 먼저","중복 시나리오 먼저","failure scenario first","race scenario first"]
allowed-tools	Read, Write, Edit, Glob, Grep, Bash

Test-First Prompting

Use this skill to force AI-assisted development to start from failure evidence, not implementation optimism.

Goal

Before writing production code, derive concrete tests for:

• race conditions
• duplicate requests
• oversell
• undersell
• Redis outage
• payment failure or timeout
• app crash during ambiguous states
• retry storm and overload

Workflow

1. Read docs/requirements.md.
2. Read docs/testing/test-first-scenarios.md.
3. Extract the invariant the user is about to implement.
4. Generate tests before production code.
5. Update docs/testing/test-first-scenarios.md with:
   • scenario ID
   • expected result
   • test level
   • implementation status
   • command/result once available
6. Only then implement the smallest production change needed to pass the test.

Required Output Before Code

## Invariant Under Test

{one sentence}

## Test Cases To Pin First

| ID | Scenario | Expected Result | Why It Matters |
|---|---|---|---|
| ... | ... | ... | ... |

## First Test To Implement

{specific test name/path and why it is first}

Hard Rules

• Do not accept "works on happy path" as sufficient.
• Every booking write-path feature must have at least one duplicate or concurrency test.
• Every fallback feature must have a degraded dependency test.
• Every retry feature must have a retry cap or retry storm test.
• If the codebase has no test harness yet, create the smallest harness first.
• If a scenario cannot be automated yet, record it as manual or pending in docs/testing/test-first-scenarios.md.