Asynchronous fixtures in a class do not work like normal fixtures.

[34j]

python 3.9.9
pytest 6.2.5
pytest-asyncio 0.18.1

import pytest
import pytest_asyncio

The following test passes.

class TestClass:
    @pytest.fixture()
    def init(self):
        self.X = True
    
    async def test_function(self, init):
        assert self.X is True

However, the following test do not pass.

class TestClassAsync:
    @pytest_asyncio.fixture()
    async def init(self):
        self.X = True
    
    async def test_function(self, init):
        assert self.X is True

=================================================================================================================== FAILURES ===================================================================================================================
_________________________________________________________________________________________________________ TestClassAsync.test_function _________________________________________________________________________________________________________ 

self = <pytest_test.TestClassAsync object at 0x0000027E9D82ECA0>, init = None

    async def test_function(self, init):
>       assert self.X is True
E       AttributeError: 'TestClassAsync' object has no attribute 'X'

pytest_test.py:27: AttributeError

If the following changes are made, the test passes.

class TestClassAsync2:        
    @pytest.fixture()    
    def init(self, event_loop:asyncio.BaseEventLoop):
        event_loop.run_until_complete(self.init_async())
    
    async def init_async(self):
        self.X = True
    
    async def test_function(self, init):
        assert self.X is True

But this seems a bit tedious; is it possible to get the second test to pass? Or is there an easier way?

[seifertm]

Thanks @34j for the report! This seems to be a duplicate of #197.

Unfortunately, I can't provide a workaround for the issue at the moment. The only other way I can think of is this:

class TestClassAsync:
    @pytest_asyncio.fixture()
    async def init(self):
        return True
    
    async def test_function(self, init):
        assert init is True

My example doesn't rely on self. The fixture returns its value directly rather than setting self.X. This should work until the issue is fixed.

[Arseniy-Popov]

This workaround seems to work fine:

class Test:
    @pytest.fixture
    async def setup(self):
        self.a = True
        return self.__dict__

    async def test(self, setup):
        self.__dict__ = setup
        assert self.a is True