py.test plugin to make session fixtures behave as if written in conftest, even if it is written in some modules
pytest-forcefail is a plugin to make scope=’session’ fixtures behave as if written in conftest.py.
See test_session_fixture_globalize.py for example.
Unlike usual plugin, this touches the deep area of _pytest.fixtures.FixtureManager. You have to enable this plugin explicitly by –session-fixture-globalize option or PYTEST_SESSION_FIXTURE_GLOBALIZE env.
Binary distribution: https://pypi.org/project/pytest-session-fixture-globalize/