pytest-fixture-config

import os import pytest import subprocess from pytest_fixture_config import Config, requires_config # 1. Define your configuration class inheriting from Config class MyAppConfig(Config): __slots__ = ('api_key', 'base_url') # Define expected config attributes # 2. Create a singleton instance, reading from environment variables APP_CONFIG = MyAppConfig( api_key=os.environ.get('MY_APP_API_KEY'), # No default, required base_url=os.environ.get('MY_APP_BASE_URL', 'https://api.example.com') # With default ) # 3. Use requires_config decorator to make fixtures dependent on config @pytest.fixture @requires_config(APP_CONFIG, ['api_key']) def authenticated_client(): """Provides an authenticated client if API_KEY is set.""" print(f"\nUsing API Key: {APP_CONFIG.api_key[:5]}... and Base URL: {APP_CONFIG.base_url}") # In a real app, this would initialize an API client class MockClient: def fetch_data(self): return {"status": "data_fetched"} return MockClient() def test_data_fetch(authenticated_client): """This test requires a valid API_KEY to run.""" assert authenticated_client.fetch_data() == {"status": "data_fetched"} # To run this example: # 1. Save as `test_app.py` # 2. Run: `pytest -s test_app.py` (it will be skipped) # 3. Set env var: `export MY_APP_API_KEY="your_secret_key"` # 4. Run again: `pytest -s test_app.py` (it should pass)