# Testing Guide

## Overview

Headquarter has comprehensive testing for both backend and frontend to ensure reliability and catch regressions.

## Backend Testing

### Test Framework

- **pytest**: Test runner
- **pytest-asyncio**: Async test support
- **httpx**: HTTP client for API tests
- **factory-boy**: Test data generation (recommended)

### Test Structure

```
apps/api/tests/
├── conftest.py              # Shared fixtures
├── test_auth_api.py         # Auth endpoint tests
├── test_auth_services.py    # Auth service tests
├── test_models.py           # Database model tests
├── test_projects_api.py     # Project endpoint tests
├── test_git_repositories.py # Repository tests
└── ...
```

### Running Tests

```bash
cd apps/api

# Run all tests
pytest

# Run with coverage
pytest --cov=src --cov-report=html

# Run specific test file
pytest tests/test_auth_api.py

# Run specific test
pytest tests/test_auth_api.py::test_login_redirect

# Run with verbose output
pytest -v

# Run async tests
pytest --asyncio-mode=auto
```

### Writing Tests

**Unit Test Example**:
```python
import pytest
from src.utils.git_url_parser import extract_base_repo_url

def test_extract_github_url():
    url = "https://github.com/user/repo/tree/main"
    result = extract_base_repo_url(url)
    assert result == "https://github.com/user/repo.git"

def test_valid_git_url_unchanged():
    url = "https://github.com/user/repo.git"
    result = extract_base_repo_url(url)
    assert result == url
```

**Async Test Example**:
```python
import pytest
from httpx import AsyncClient

@pytest.mark.asyncio
async def test_get_projects(client: AsyncClient):
    response = await client.get("/projects")
    assert response.status_code == 200
    assert isinstance(response.json(), list)
```

**API Integration Test**:
```python
@pytest.mark.asyncio
async def test_create_project(client: AsyncClient, auth_headers):
    response = await client.post(
        "/projects",
        json={"name": "Test Project"},
        headers=auth_headers
    )
    assert response.status_code == 201
    data = response.json()
    assert data["name"] == "Test Project"
    assert "id" in data
```

### Test Fixtures

**conftest.py** provides:

```python
import pytest
from httpx import AsyncClient

@pytest.fixture
async def client():
    from src.main import app
    async with AsyncClient(app=app, base_url="http://test") as client:
        yield client

@pytest.fixture
async def auth_headers(client):
    # Login and return auth headers
    response = await client.post("/auth/login")
    # ... setup session
    return {"Cookie": "session=..."}
```

### Test Database

Tests use a separate database:

```bash
# Test database URL (from .env)
TEST_DATABASE_URL=postgresql+asyncpg://headquarter:headquarter@localhost:5432/headquarter_test

# Run tests with test DB
TEST_DATABASE_URL=... pytest
```

## Frontend Testing

### Test Framework

- **Vitest**: Test runner
- **React Testing Library**: Component testing
- **jsdom**: DOM environment

### Test Structure

```
apps/web/src/
├── components/
│   └── protected-route.test.tsx
├── pages/
│   ├── dashboard.test.tsx
│   └── projects.test.tsx
└── test/
    └── setup.ts              # Test setup
```

### Running Tests

```bash
cd apps/web

# Run all tests
npm run test

# Run in watch mode
npm run test -- --watch

# Run with coverage
npm run test -- --coverage

# Run specific file
npm run test -- protected-route
```

### Writing Tests

**Component Test Example**:
```typescript
import { render, screen, fireEvent } from '@testing-library/react';
import { FileTree } from '../components/file-tree';

describe('FileTree', () => {
  const mockFiles = [
    { name: 'src', type: 'directory', path: 'src' },
    { name: 'main.py', type: 'file', path: 'src/main.py' },
  ];

  it('renders file list', () => {
    render(<FileTree files={mockFiles} onFileClick={() => {}} />);
    
    expect(screen.getByText('src')).toBeInTheDocument();
    expect(screen.getByText('main.py')).toBeInTheDocument();
  });

  it('calls onFileClick when file clicked', () => {
    const handleClick = vi.fn();
    render(<FileTree files={mockFiles} onFileClick={handleClick} />);
    
    fireEvent.click(screen.getByText('main.py'));
    expect(handleClick).toHaveBeenCalledWith(mockFiles[1]);
  });
});
```

**Async Test Example**:
```typescript
import { render, screen, waitFor } from '@testing-library/react';
import { ProjectsPage } from '../pages/projects';

describe('ProjectsPage', () => {
  it('loads and displays projects', async () => {
    render(<ProjectsPage />);
    
    await waitFor(() => {
      expect(screen.getByText('My Projects')).toBeInTheDocument();
    });
  });
});
```

## E2E Testing (Future)

### Playwright Setup

```bash
cd apps/web
npm install -D @playwright/test
npx playwright install
```

**Example E2E Test**:
```typescript
import { test, expect } from '@playwright/test';

test('user can login', async ({ page }) => {
  await page.goto('http://localhost:5173');
  await page.click('text=Login');
  
  // Authentik login
  await page.fill('[name="username"]', 'test@example.com');
  await page.fill('[name="password"]', 'password');
  await page.click('text=Sign In');
  
  // Should redirect back to app
  await expect(page).toHaveURL('http://localhost:5173/dashboard');
});
```

## Test Data

### Factories (Recommended)

Use factory-boy for test data:

```python
# tests/factories.py
import factory
from src.models.user import User

class UserFactory(factory.Factory):
    class Meta:
        model = User
    
    email = factory.Faker('email')
    name = factory.Faker('name')
    authentik_id = factory.Faker('uuid4')
```

### Fixtures

```python
@pytest.fixture
async def test_user(db_session):
    user = UserFactory()
    db_session.add(user)
    await db_session.commit()
    return user
```

## Coverage Goals

| Component | Target Coverage |
|-----------|----------------|
| Backend API | 80%+ |
| Backend Services | 90%+ |
| Backend Models | 90%+ |
| Frontend Components | 70%+ |
| Frontend Pages | 60%+ |

## Continuous Integration

### GitHub Actions (Example)

```yaml
name: Tests
on: [push, pull_request]

jobs:
  backend:
    runs-on: ubuntu-latest
    services:
      postgres:
        image: postgres:15
        env:
          POSTGRES_PASSWORD: headquarter
    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-python@v4
        with:
          python-version: '3.11'
      - run: pip install -e ".[dev]"
      - run: pytest --cov=src --cov-report=xml
      
  frontend:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-node@v3
        with:
          node-version: '18'
      - run: cd apps/web && npm ci
      - run: cd apps/web && npm run test
```

## Best Practices

### Backend
1. **Test isolation**: Each test should be independent
2. **Use fixtures**: Don't repeat setup code
3. **Mock external services**: Authentik, git operations
4. **Test edge cases**: Empty lists, invalid inputs, errors
5. **Async properly**: Use `pytest.mark.asyncio` and async fixtures

### Frontend
1. **Test behavior, not implementation**: Check what user sees
2. **Use data-testid**: For stable selectors
3. **Mock API calls**: Don't hit real backend
4. **Test accessibility**: Use `screen.getByRole`
5. **Snapshot sparingly**: Only for complex UIs

## Debugging Tests

### Backend
```bash
# Run with debugger
pytest --pdb

# Run specific test with verbose
pytest -v -s test_file.py::test_name

# Show print statements
pytest -s
```

### Frontend
```bash
# Debug mode
npm run test -- --reporter=verbose

# Show browser (for E2E)
npx playwright test --headed
```

## Resources

- [pytest Documentation](https://docs.pytest.org/)
- [React Testing Library](https://testing-library.com/docs/react-testing-library/intro/)
- [Vitest Documentation](https://vitest.dev/)
- [Playwright Documentation](https://playwright.dev/)