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.

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npx skill4agent add helderberto/skills tdd

Tags

Translated version includes tags in frontmatter
test-driven-developmentred-green-refactortdd-workflowtesting-philosophyanti-patterns

SKILL.md Content

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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.