Pytest parametrize + Fixtures

Question

I am using fixtures to mock my requests.

I am also using @pytest.mark.parametrize() to add arguments to my tests.

I can do this:

def test_format(mock_api):

I can do this:

@pytest.mark.parametrize(
    "format",
    [
        ("xxx"),
        ("yyy"),
    ],
)
def test_format(format):

but I can't do this:

@pytest.mark.parametrize(
    "my_mock",
    [
        (mock_api),
        (None),
    ],
)
def test_format(my_mock):

Does anyone know a workaround for this?

[UPDATE] here is my fixture:

@fixture(scope="function")
def mock_api(app):
    app.test_client_class = build_test_client_class(
        {
            "Authorization": "XXX",
            "X-API-KEY": "YYY",
        }
    )
    with app.test_client() as client:
        yield client