What tools or libraries have you used for conducting asynchronous tests?

For testing asynchronous code in Python, the following tools and libraries are commonly used:

• pytest-asyncio — a plugin for pytest that allows writing and executing async tests with async def.
• asyncio — Python's standard library for asynchronous programming; in tests, you can use asyncio.run() or special fixtures.
• aiohttp.test_utils — for testing async HTTP servers and clients.

Example of an async test with pytest-asyncio:

import pytest
import asyncio

async def async_function():
    await asyncio.sleep(0.1)
    return 42

@pytest.mark.asyncio
async def test_async_function():
    result = await async_function()
    assert result == 42

Thus, for asynchronous testing, it is important to use tools that support async/await syntax.