Im using unittest.mock for building tests for my python code. I have a method that I am trying to test that contains a async call to another function. I want to patch that async call so that I can just have Mock return a testing value for the asset id, and not actually call the async method. I have tried many things I've found online, but none have worked thus far.
Simplified example below:
test.py
import pytest
from app.create.creations import generate_new_asset
from app.fakeapi.utils import create_asset
from unittest.mock import Mock, patch
@patch("app.fakeapi.utils.create_asset")
@pytest.mark.anyio
async def test_generate_new_asset(mock_create):
mock_create.return_value = 12345678
await generate_new_asset()
...
creations.py
from app.fakeapi.utils import create_asset
...
async def generate_new_asset()
...
# When I run tests this does not return the 12345678 value, but actually calls the `create_asset` method.
return await create_asset(...)
Testing async code is bit tricky. If you are using python3.8 or higher AsyncMock is available.
Note: it will work only for Python > 3.8
I think in your case event loop is missing. Here is the code which should work, you may need to do few tweaks. You may also need to install pytest-mock. Having it as fixture will allow you to have mock different values for testing for different scenarios.
import asyncio
from unittest.mock import AsyncMock, Mock
@pytest.fixture(scope="module")
def mock_create_asset(mocker):
async_mock = AsyncMock()
mocker.patch('app.fakeapi.utils.create_asset', side_effect=async_mock)
return async_mock
@pytest.fixture(scope="module")
def event_loop():
return asyncio.get_event_loop()
@pytest.mark.asyncio
async def test_generate_new_asset(mock_create_asset):
mock_create_asset.return_value = 12345678
await generate_new_asset()