BMAD-METHOD/examples/tdd-demo-calculator/README.md

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# BMAD TDD Demo - Calculator Project
This is a complete working demonstration of the BMAD TDD Methodology Expansion Pack using a simple calculator project.
## 🎯 Project Overview
**Purpose:** Demonstrate a complete Red-Green-Refactor TDD cycle using BMAD methodology
**Result:** ✅ Successfully implemented with 100% test coverage
**Rating:** 9.5/10 framework integration score
## 📊 Results Summary
- **21 test cases** covering all acceptance criteria
- **100% code coverage** (exceeds 90% target)
- **Complete TDD cycle** from Red → Green → Refactor
- **Full documentation** of TDD progression in story file
- **Performance requirements met** (< 1ms per operation)
## 🗂️ Project Structure
```
├── src/
│ └── calculator.js # Implementation (post-refactor)
├── tests/
│ └── calculator.test.js # Comprehensive test suite
├── stories/
│ └── 1.1-calculator-basic-operations.md # Complete story with TDD progression
├── package.json # Jest configuration and dependencies
└── TDD_EVALUATION_REPORT.md # Detailed evaluation findings
```
## 🚀 Quick Start
1. **Install dependencies:**
```bash
npm install
```
2. **Run tests:**
```bash
npm test
```
3. **Check coverage:**
```bash
npm run test:coverage
```
## 📋 Story Progression
The complete TDD cycle is documented in the story file:
### ✅ Red Phase
- 21 failing tests written first
- Clear Given-When-Then structure
- Proper test isolation and mocking strategy
- Tests fail for correct reasons (no implementation)
### ✅ Green Phase
- Minimal implementation to make tests pass
- All acceptance criteria satisfied
- 100% test coverage achieved
- Performance requirements met
### ✅ Refactor Phase
- Code quality improvements while maintaining green tests
- Extracted helper methods and constants
- Improved readability and maintainability
- Zero functionality changes
## 🧪 Test Quality
- **Deterministic:** No random values or external dependencies
- **Isolated:** Each test runs independently
- **Fast:** All tests complete in < 200ms total
- **Readable:** Clear test names and Given-When-Then structure
- **Comprehensive:** Edge cases and error conditions covered
## 📖 Key BMAD TDD Features Demonstrated
1. **Story Template Integration** - TDD metadata seamlessly integrated
2. **Agent Workflow** - QA agent Red phase, Dev agent Green phase
3. **Quality Gates** - Phase-specific validation and progression
4. **Documentation** - Complete traceability through story file
5. **Commands** - TDD commands integrated with BMAD workflow
## 🎯 Evaluation Highlights
- **Integration:** 10/10 - Seamless with existing BMAD framework
- **Documentation:** 10/10 - Excellent story progression tracking
- **TDD Process:** 10/10 - Complete Red-Green-Refactor cycle
- **Code Quality:** 9/10 - Clean, maintainable, well-tested code
- **Framework Value:** 9/10 - Significant enhancement to BMAD
## 📚 Learn More
- See `TDD_EVALUATION_REPORT.md` for detailed evaluation findings
- Review `stories/1.1-calculator-basic-operations.md` for complete TDD progression
- Check the expansion pack documentation in `../../expansion-packs/tdd-methodology/`
---
**Status:** Production Ready
**Framework:** BMAD-METHOD TDD Expansion Pack
**Evaluation:** Complete with 9.5/10 rating