Hello everyone. I was following the Contributing Guide, but when I run

pytest tests

I get:

ImportError while loading conftest '/Users/daniel.mesejo/PycharmProjects/prefect/tests/conftest.py'.
tests/conftest.py:67: in <module>
    from prefect.testing.cli import *
src/prefect/testing/cli.py:7: in <module>
    from prefect.cli import app
src/prefect/cli/__init__.py:9: in <module>
    import prefect.cli.cloud
src/prefect/cli/cloud.py:58: in <module>
    login_api = FastAPI(on_startup=[set_login_api_ready_event])
../../opt/anaconda3/envs/prefect/lib/python3.8/site-packages/fastapi/applications.py:124: in __init__
    self.router: routing.APIRouter = routing.APIRouter(
../../opt/anaconda3/envs/prefect/lib/python3.8/site-packages/fastapi/routing.py:502: in __init__
    super().__init__(
../../opt/anaconda3/envs/prefect/lib/python3.8/site-packages/starlette/routing.py:592: in __init__
    warnings.warn(
E   DeprecationWarning: The on_startup and on_shutdown parameters are deprecated, and they will be removed on version 1.0. Use the lifespan parameter instead. See more about it on <https://www.starlette.io/lifespan/>.

This is because the latest version (0.94.0) of FastAPI uses the version 0.26.0.post1 of starlette, that it turn introduces the

DeprecationWarning

. The last update for FastAPI was done yesterday March 10th (see here). In the short term downgrading to 0.93.0 (

pip install fastapi==0.93.0

) solves the issue, but perhaps for the future is worth creating a ticket to start using the lifespan parameter. What would be the best course of action here? In any case I’ll be happy to help 🙂.

We’ll want to first add an ignore for those warnings to our pytest configuration so we can run the test suite succesfully

Thanks! I’ll see if I can start working on it

Feel free to lmk if you have questions!