Undocumented breaking changes from v8->v9?

[charmingduchess]

Looking though the backwards-incompatible breaking changes in the release notes for v9, I don't see anything called out that would cause the following code to stop working. Yet, when I run this test using v9.0.0, I get an error:
fixture 'mock_token_server' not found
The other tests not using this fixture pass in v9, and all tests, including tests that use the fixture run fine when I revert to 8.3.5.
Am I missing something? The only changes I see regarding fixtures is this bug fix, but that doesn't feel relevant here.

import pytest
import responses

class TestClient:
    @responses.activate
    @pytest.fixture(autouse=True)
    def mock_token_server(self):
        return responses.post(
            'https://fake-token.com', json={"access_token": "12345"}
        )

    @responses.activate
    def test_create_job_ok(self, mock_token_server):
       print('whatever')

pinned dependencies from pyproject:

[dependency-groups]
dev = [    
    "pydantic==2.10.6",
    "flake8>=7.3.0",
    "mock>=5.2.0",
    "pytest==9.0.0", // or 8.3.5
    "pytest-mock==3.15.1",
    "responses>=0.25.7"
    ]

EDIT: updated so code is more reproducible

[RonnyPfannschmidt]

this is related to fxitures no longer being functions

there should be a warning on this

a quick workaround is to put fixture around responses.activate isntead of within

[charmingduchess]

Yea I got a working solution, I'm more curious as to why this isn't called out in 9.0 breaking changes?

[RonnyPfannschmidt]

Its a bug in in the other library

It jusz nevet surfaced before