@pytest.fixture(params=[MetaWithInit, MetaWithoutInit, ModelFormMeta])
def model_form_all(request):
    ModelForm = model_form_factory(meta=request.param)
    return ModelForm
Returns one of each possible model form classes with custom and the
dataset/ETHPy150Open kvesteri/wtforms-alchemy/tests/conftest.py/model_form_all