tdd

Original：🇺🇸 English

Translated

Test-driven development with red-green-refactor loop. Use when user wants to build features or fix bugs using TDD, mentions "red-green-refactor", wants test-first development, or requests TDD workflow.

1installs

Sourcehelderberto/skills

Added on2026-02-15

NPX Install

npx skill4agent add helderberto/skills tdd

SKILL.md Content

View Translation Comparison →

Test-Driven Development

Philosophy

Tests verify behavior through public interfaces, not implementation. Good tests survive refactors.

See

principles.md

for testing philosophy and anti-patterns.

Workflow

1. Planning

Confirm interface design with user
List behaviors to test (prioritize critical paths)
Get approval before writing code

2. Tracer Bullet

RED:   Write first test → fails
GREEN: Minimal code to pass → passes

3. Incremental Loop

For each remaining behavior:

RED:   Write next test → fails
GREEN: Minimal code to pass → passes

Rules:

One test at a time
Minimal code to pass
No refactoring while RED

4. Refactor

Once all tests GREEN:

Remove duplication
Improve structure
Tests must stay GREEN

Anti-Pattern: Horizontal Slices

DO NOT write all tests first, then all implementation. DO use vertical slices: one test → one implementation → repeat.

See

examples.md

for workflow demonstrations.

tdd