tdd-cycle

name	tdd-cycle
description	Run complete TDD red-green-refactor cycle for a test
allowed-tools	Read, Edit, Write, Bash, Grep, Glob

TDD Cycle

Execute a complete Red -> Green -> Refactor cycle.

Workflow

1. Verify Task File

Check for .tasks/YYYY-MM-DD-*.md. If missing, create one before proceeding.

2. RED — Write Failing Test

1. Show test inventory from task file, ask which test to implement
2. Study patterns from existing tests (unit -> assert_test.sh, doubles -> doubles_test.sh)
3. Write the failing test following Arrange-Act-Assert
4. Run: ./bashunit path/to/test.sh — must fail
5. Verify failure is for the RIGHT reason (not syntax error or wrong setup)
6. Update task file: current red bar + logbook entry

3. GREEN — Make It Pass

1. Write minimal code in src/ — only enough for THIS test
2. Run: ./bashunit path/to/test.sh — must pass
3. Update task file: check off test + logbook entry

4. REFACTOR — Improve Code

1. Improve readability, naming, extract duplication — no behavior changes
2. Run tests after each change
3. Quality checks: make sa && make lint && shfmt -w .
4. Full suite: ./bashunit tests/
5. Update task file with refactoring notes

5. Next Test

Show updated test inventory. Ask if continuing or done.

Critical Rules

• Never skip RED — always verify test fails first
• Minimal code in GREEN — resist feature creep
• All tests green during REFACTOR — revert if broken
• Update task file after each phase