@pytest.fixture compatibility issue

[andras-tim]

Typesafety drops a typesafety.validator.TypesafetyError: Missing required argument '...' exception, when I decorate a py.test helper function with @pytest.fixture

import pytest

class TestFoo:
    @pytest.fixture
    def res(self):
        return Resource()

    def test_foo(self, res: Resource):
        assert res.bar is not None