[Python] Pytest mocker not mocking

I have the following structure for my code which is a fastapi app:

/repo
/src
main.app
/routes
/resource
resource.py
/repository
repository.py
/tests
/routes
/resource
resource_test.py


/src/routes/resource/resource.py

def get_repository() -> Repository:
return repository

RepositoryDep = Annotated[Repository, Depends(get_repository)]


router = APIRouter()

@router.get("/")
def list(repo: RepositoryDep) -> list[Alumno]:
return repo.list()


/src/repository/repository.py

class Repository:
...

repository = Repository()


Then I have some tests for my router like this tests/routes/resource/resource.py


client = TestClient(app)

def test_get_resources(mocker) -> None:
mock_repo = MagicMock(Repository)
mock_repo.list.return_value = [
Resource(id=1, name="Something", age=20),
Resource(id=2, name="Something2", age=22)
]

mocker.patch('src.routes.resource.resource.get_repository', return_value=mock_repo)
response = client.get(
"/resources/",
)

assert response.status_code == 200
content = response.json()
assert len(content) == 2


But this tests fails, the repository used (checked by debugging) is not the mock I set up, it's the real object.

Why is it not mocking?

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