Tdd

SKILL.md

---
name: tdd
metadata:
  author: es6kr
  version: "0.1.0"
description: Test-Driven Development for coding and bug fixing. cycle - Red→Green→Refactor cycle, defining expected behavior, bug-fix TDD, anti-patterns [cycle.md], run - test execution workflow (environment detection→impact scope→execution→result reporting) [run.md], test-strategies - boundary value·equivalence partitioning·decision table·error guessing·path coverage test design techniques [test-strategies.md]. "TDD", "test first", "failing test", "doesn't work", "not working", "test design", "boundary value test", "test strategies", "equivalence partitioning", "bug fix", "run tests", "execute tests", "test run", "verify" triggers
---

# TDD (Test-Driven Development)

Test-Driven Development: define expected behavior first, then make it pass with implementation.

## Topics

| Topic | Description | Guide |
|-------|-------------|-------|
| cycle | Red→Green→Refactor cycle, bug-fix TDD, anti-patterns | [cycle.md](./cycle.md) |
| run | Test execution workflow (environment detection→impact scope→execution→result reporting) | [run.md](./run.md) |
| test-strategies | Boundary value·equivalence partitioning·decision table·error guessing·path coverage | [test-strategies.md](./test-strategies.md) |

## Quick Reference

### Trigger entry (HARD STOP — first action)

When this skill is invoked, the FIRST tool call must be TaskCreate (Red/Green/Refactor/Verify) + Red test authoring. Diagnosis, planning, option asks, and medium decisions are forbidden before Red is authored + executed + failure confirmed. See [cycle.md "Trigger entry"](./cycle.md).

### TDD Cycle
Define expected behavior → natural failure → implement → pass → refactor.
See [cycle.md](./cycle.md).

### Test Execution
Environment detection → impact scope → execution (unit→integration→e2e) → result reporting.
See [run.md](./run.md).

### Test Design Techniques
Decide which test cases to write (boundary value, equivalence partitioning, etc.).
See [test-strategies.md](./test-strategies.md).