django-dev-test

# Django Testing Patterns

pytest-django testing with factory_boy for fixture management.

## Core Principles

1. **pytest only** - Never use Django's TestCase
2. **factory_boy** - Use factories for all test data
3. **Mirror structure** - Tests mirror app structure
4. **Isolation** - Each test fully isolated
5. **Fast fixtures** - Prefer `@pytest.fixture` over setUp

## Installation

```bash
pip install pytest pytest-django factory-boy pytest-cov
```

## Configuration

`pytest.ini` or `pyproject.toml`:

```toml
# pyproject.toml
[tool.pytest.ini_options]
DJANGO_SETTINGS_MODULE = "config.settings"
python_files = ["test_*.py", "*_test.py"]
python_classes = ["Test*"]
python_functions = ["test_*"]
addopts = [
    "--strict-markers",
    "-ra",
    "--tb=short",
]
markers = [
    "slow: marks tests as slow",
    "integration: marks tests as integration tests",
]
```

## Test Structure

```
tests/
├── conftest.py              # Shared fixtures
├── factories/
│   ├── __init__.py
│   ├── user.py              # UserFactory
│   ├── product.py           # ProductFactory
│   └── order.py             # OrderFactory
├── unit/
│   ├── models/
│   │   ├── test_user.py
│   │   └── test_product.py
│   └── services/
│       └── test_user_service.py
├── integration/
│   └── api/
│       ├── test_users.py
│       └── test_products.py
└── e2e/
    └── test_checkout.py
```

## Conftest Setup

`tests/conftest.py`:

```python
import pytest
from django.test import Client
from ninja.testing import TestClient

from apps.myapp.api import api


@pytest.fixture
def client():
    """Django test client."""
    return Client()


@pytest.fixture
def api_client():
    """Django Ninja test client."""
    return TestClient(api)


@pytest.fixture
def authenticated_client(api_client, user):
    """API client with authentication."""
    api_client.headers["Authorization"] = f"Bearer {user.get_token()}"
    return api_client


@pytest.fixture
def user(user_factory):
    """Default test user."""
    return us