Fast api override dependency as a class

Question

I am trying to write test on some endpoint in fastAPI that has a auth dependency:

router = APIRouter(dependencies=[Security(auth.AccountAuth())])

In the conftest.py. I have a class to override that dependency (I checked the formatted payload as well from jwt when calling the api):

class AccountAuthTest:

def __init__(self):
    pass

async def __call__( 
    self
) -> FormattedPayload:
    return FormattedPayload(email="myemail",
                            accounts={},
                            id="someid",
                            scopes=None,
                            permissions=[],
                            m2m=False)

I create a fixture like this one:

@pytest.fixture()
 def fastapi_authenticated_app(
    dbsession: AsyncSession,
) -> FastAPI:
"""
Fixture for creating FastAPI app.
:return: fastapi app with mocked dependencies.
"""



application, sub_app = get_app()
sub_app.dependency_overrides[get_db_session] = lambda: dbsession
sub_app.dependency_overrides[auth.AccountAuth()] = lambda: AccountAuthTest()


return application

I expect the test will run correctly but it showed me 403. I don't know why this goes wrong here

Answer 1

I ran into the same issue, and found this solution on Github: https://github.com/tiangolo/fastapi/issues/2795#issuecomment-778031303.

In your case, this would mean:

from dataclasses import dataclass


@dataclass(frozen=True)
class AccountAuthTest:

    async def __call__(self) -> FormattedPayload:
        ...