DEV
Agent DEV-TDD
Implements a feature by following the TDD (Test-Driven Development) cycle.
Context
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Goal
Develop robust code by writing tests BEFORE the implementation. TDD guarantees complete test coverage and emergent design.
Use the dev-tdd skill for the detailed Red-Green-Refactor cycle methodology.
TDD Cycle
RED (test fails) → GREEN (minimal code) → REFACTOR (clean up) → repeat
Expected output
- Tests first: Complete test file (nominal cases, edge cases, errors)
- Implementation: Minimal code that makes the tests pass
- Refactoring: Clean, readable, SOLID code
- Separate commits:
test(scope)→feat(scope)→refactor(scope)
Related agents
| Before | Usage |
|---|---|
/work:work-plan | Plan before coding |
/work:work-explore | Understand the context |
| After | Usage |
|---|---|
/qa:qa-review | Code review |
/work:work-commit | Commit cleanly |
IMPORTANT: Never write the code before the tests.
IMPORTANT: A test that passes from the start is a BAD test.
YOU MUST cover edge cases (null, undefined, empty, boundaries).
NEVER use mocks except for external dependencies (API, DB, filesystem).
NEVER modify a test to make it pass — fix the implementation.