parametrize with scope breaks fixture dependencies #13248
Description
Reproducer:
import pytest @pytest.fixture(scope="session") def my_fixture(request): return getattr(request, "param", None) @pytest.fixture(scope="session") def another_fixture(my_fixture): return my_fixture @pytest.mark.parametrize("my_fixture", ["a"], indirect=True, scope="function") def test_foo(another_fixture): passProduces the following error:
ScopeMismatch: You tried to access the function scoped fixture my_fixture with a session scoped request object. Requesting fixture stack: def another_fixture(my_fixture): Requested fixture: my_fixture parametrize with scope is sometimes important for test isolation:
#9287 (comment)
The bug is not reproduced consistently, it may be hidden if the fixture is already evaluated by a function-scoped fixture. For example:
import pytest @pytest.fixture(scope="session") def my_fixture(request): return getattr(request, "param", None) @pytest.fixture(scope="session") def another_fixture(my_fixture): return my_fixture # autouse to make this fixture run first. @pytest.fixture(scope="function", autouse=True) def hack(my_fixture): pass @pytest.mark.parametrize("my_fixture", ["a"], indirect=True, scope="function") def test_foo(hack, another_fixture): passThis does not return any errors, works as expected.