👀 Views: 11 💬 Answers: 1 📅 Created: 2025-09-07

python-3.x unittest asyncio testing Python

I'm converting an old project and I can't seem to get I've looked through the documentation and I'm still confused about After trying multiple solutions online, I still can't figure this out. Currently developing a feature that involves several asynchronous functions to handle API calls. I've been diving into the unittest module for testing these functions, but it feels like I've hit a wall. The issue arises when I try to run tests on functions defined with `async def`. Here's a simplified version of what I'm working with: ```python import asyncio import unittest async def fetch_data(): await asyncio.sleep(1) return {'data': 123} class TestAsyncFunctions(unittest.TestCase): async def test_fetch_data(self): result = await fetch_data() self.assertEqual(result['data'], 123) if __name__ == '__main__': unittest.main() ``` When I run this, I get the error `TypeError: test_fetch_data() is not a coroutine`. I tried using `asyncio.run()` inside a synchronous test method, but that didn't work out either. I also attempted switching to `pytest` with the `pytest-asyncio` plugin, which seems to be a widely recommended approach. Here’s what I tried with that: ```python import pytest @pytest.mark.asyncio async def test_fetch_data(): result = await fetch_data() assert result['data'] == 123 ``` This works, but I would like to stick with `unittest` if possible. Can anyone share insights on how I can properly test asynchronous functions using `unittest` in Python 3.10? Are there best practices I should know about or specific patterns to follow that might help me get through this phase more smoothly? My development environment is Linux. Thanks in advance! This is happening in both development and production on Windows 10. Thanks in advance! Could this be a known issue?