How can I use pytest-asyncio for advanced testing?

How can I use pytest-asyncio for advanced testing?

You can use pytest-asyncio to test asynchronous code in Python. It provides fixtures and tools to handle async functions.

Can you give me an example of testing an async function?

Sure! Here's a simple example:

import pytest
import asyncio

async def fetch_data():
    await asyncio.sleep(1)
    return 'data'

@pytest.mark.asyncio
async def test_fetch_data():
    result = await fetch_data()
    assert result == 'data'

What if I want to test multiple async functions?

You can use pytest.mark.parametrize to run multiple tests with different inputs. Here's an example:

@pytest.mark.parametrize('input, expected', [
    (1, 'data1'),
    (2, 'data2'),
])
@pytest.mark.asyncio
async def test_multiple_fetch(input, expected):
    result = await fetch_data(input)
    assert result == expected

Are there any best practices for using pytest-asyncio?

Yes, some best practices include keeping tests isolated, using fixtures for setup, and avoiding blocking calls in async tests.