Is there any way to create a fixture with a default indirect parameter?

[migue99angel]

I'm thinking about creating a fixture parametrized by the indirect parameter as the documentation specified here:

But I am wondering if something like this is possible:

@pytest.fixture()
def populate_roles(request) -> list[Role]:
    """
    Generate n roles introduced by an indirect parameter, by default 5 are generated
    """
    created_roles = []
    for test in range(request.param or 5):
       # Code for generating a role

Actually, I am receiving this error: AttributeError: 'SubRequest' object has no attribute 'param'

Thank you! 😊

[portyu9]

Hi @migue99angel

request.param only exists when that fixture has actually been parametrized.

For a fixture that should also work without indirect parametrization, give it an explicit fallback:

@pytest.fixture
def populate_roles(request):
    count = getattr(request, "param", 5)

    created_roles = []
    for _ in range(count):
        # create role
        ...
    return created_roles

Then both cases work:

def test_default(populate_roles):
    # uses 5
    ...

and:

@pytest.mark.parametrize("populate_roles", [3], indirect=True)
def test_three_roles(populate_roles):
    # uses 3
    ...

I would use getattr(request, "param", 5) rather than something like getattr(..., None) or 5, because the latter also changes a legitimate parameter value of 0 into 5.

Please mark this answer as accepted if it helped, thank you.