tdd-workflows-tdd-green

Green Phase: Simple function

def product_list(request): products = Product.objects.all() return JsonResponse({'products': list(products.values())})

Refactor: Class-based view

class ProductListView(View): def get(self, request): products = Product.objects.all() return JsonResponse({'products': list(products.values())})

Refactor: Generic view

class ProductListView(ListView): model = Product context_object_name = 'products'

### Express Patterns

**Inline → Middleware → Service Layer:**
```javascript
// Green Phase: Inline logic
app.post('/api/users', (req, res) => {
  const user = { id: Date.now(), ...req.body };
  users.push(user);
  res.json(user);
});

// Refactor: Extract middleware
app.post('/api/users', validateUser, (req, res) => {
  const user = userService.create(req.body);
  res.json(user);
});

// Refactor: Full layering
app.post('/api/users',
  validateUser,
  asyncHandler(userController.create)
);

Use this skill when

• Moving from red to green in a TDD cycle
• Implementing minimal behavior to satisfy tests
• You want to keep implementation intentionally simple

Do not use this skill when