Repeat: Red → Green → Refactor

1. Red:    Write a failing test
2. Green:  Write minimal code to pass the test
3. Refactor: Clean up code (tests still pass)

# tests/test_{module}.py
def test_{function}_basic():
    """Test the most basic case"""
    result = function(input)
    assert result == expected

uv run pytest tests/test_{module}.py -v

uv run pytest tests/test_{module}.py -v

uv run pytest tests/test_{module}.py -v  # Confirm still passes

# Run all tests
uv run pytest -v

# Check coverage (target 80%+)
uv run pytest --cov={module} --cov-report=term-missing

## TDD Complete: {Feature Name}

### Test Cases
- [x] {test1}: {description}
- [x] {test2}: {description}
...

### Coverage
{Coverage report}

### Implementation Files
- `src/{module}.py`: {description}
- `tests/test_{module}.py`: {N} tests