Custom fixture unable to inherit target_fixtures

I am trying to create a custom fixture based on value created from a step's target_fixture with no success. I do understand custom and target_fixture are not exactly the same, but I wonder if there is a way I can make it work. For example:

# My custom fixture
@pytest.fixture
def storyboard(storyboard_response):
    return storyboard_response["storyboard"]

@when("get storyboard", target_fixture="storyboard_response")
def get_timeline_storyboard(driver, request):
    response = driver.get_storyboard(123)
    return response

When I try to use a another step that inherit storyboard custom fixture, I get this error:

venv-e2e/lib/python3.7/site-packages/pytest_bdd/scenario.py:216 (test_render_timeline_storyboard_with_video_sources)
.0 = <list_iterator object at 0x7f8b0835aeb8>

>   kwargs = {arg: kwargs[arg] if arg in kwargs else request.getfixturevalue(arg) for arg in args}

venv-e2e/lib/python3.7/site-packages/pytest_bdd/scenario.py:154: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
venv-e2e/lib/python3.7/site-packages/_pytest/fixtures.py:585: in getfixturevalue
    fixturedef = self._get_active_fixturedef(argname)
venv-e2e/lib/python3.7/site-packages/_pytest/fixtures.py:607: in _get_active_fixturedef
    self._compute_fixture_value(fixturedef)
venv-e2e/lib/python3.7/site-packages/_pytest/fixtures.py:693: in _compute_fixture_value
    fixturedef.execute(request=subrequest)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <FixtureDef argname='storyboard' scope='function' baseid=''>
request = <SubRequest 'storyboard' for <Function test_render_timeline_storyboard_with_video_sources>>

    def execute(self, request: SubRequest) -> FixtureValue:
        # Get required arguments and register our own finish()
        # with their finalization.
        for argname in self.argnames:
            fixturedef = request._get_active_fixturedef(argname)
            if argname != "request":
                # PseudoFixtureDef is only for "request".
>               assert isinstance(fixturedef, FixtureDef)
E               AssertionError

venv-e2e/lib/python3.7/site-packages/_pytest/fixtures.py:1048: AssertionError

As workaround that I prefer not to do, I defined the storyboard in conftest.py and I retrieve the target_fixture value like this:

@pytest.fixture
def storyboard(request):
    # Storyboard custom fixture for easier access
    storyboard_response = request.getfixturevalue("storyboard_response")
    return storyboard_response["storyboard"]

pytest-dev / pytest-bdd

Custom fixture unable to inherit target_fixtures #695