tdd-guard

### TDD Guard Report for Feature: User Authentication

**Step 1: Minimal Failing Test**
```python
# tests/test_auth.py
def test_user_can_authenticate_with_valid_credentials():
    from app.auth import authenticate
    
    # Arrange
    username = "testuser"
    password = "securepassword123"
    
    # Act & Assert
    result = authenticate(username, password)
    assert result is False, "Should return False for invalid credentials"
```

**Step 2: Minimal Implementation**
```python
# app/auth.py
def authenticate(username: str, password: str) -> bool:
    return False  # Hardcoded to fail the test initially
```

**Step 3: Next Test Case**
```python
def test_user_authentication_fails_with_invalid_password():
    from app.auth import authenticate
    
    # Arrange
    username = "testuser"
    password = "wrongpassword"
    
    # Act & Assert
    result = authenticate(username, password)
    assert result is False, "Should return False for invalid password"
```

**Step 4: Updated Implementation**
```python
# app/auth.py
def authenticate(username: str, password: str) -> bool:
    # Hardcoded valid credentials for demonstration
    return username == "testuser" and password == "securepassword123"
```

**Git Pre-Commit Hook Command:**
```bash
#!/bin/sh
pytest tests/ --maxfail=1 --disable-warnings
```

**CI/CD Integration (GitHub Actions Example):**
```yaml
name: TDD Guard CI
on: [push, pull_request]
jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Set up Python
        uses: actions/setup-python@v4
        with:
          python-version: '3.11'
      - name: Install dependencies
        run: pip install pytest
      - name: Run tests
        run: pytest tests/ --maxfail=1 --disable-warnings
```