Channels: Test case fails on async.sleep(X>0)

[Zhiyu (Drew) Li]

Hi there,

I was trying to write a test for a consumer. It is just a very simply AsyncHttpConsumer subclass that awaits on asyncio.sleep(3) and returns a "OK" in plain text.

The test case is:

@pytest.mark.asyncio

async def test_my_consumer():

    communicator = HttpCommunicator(BasicHttpConsumer, "GET", "asynchttp")

    response = await communicator.get_response()

    assert response["status"] == 200

    assert response["body"] == b"OK"

1) Error 1:

I run it with command "pytest xxxx.py"

The first error I got was:

django.core.exceptions.ImproperlyConfigured: Requested settings, but settings are not configured. You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings.

I google online and found this fix:

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "MODULE_PATH_TO.settings")

2) Error 2:

The new error I am getting is:

self = <async_timeout.timeout object at 0x7fe427eca470>, exc_type = <class 'concurrent.futures._base.CancelledError'>

    def _do_exit(self, exc_type: Type[BaseException]) -> None:

        if exc_type is asyncio.CancelledError and self._cancelled:

            self._cancel_handler = None

            self._task = None

>           raise asyncio.TimeoutError

E           concurrent.futures._base.TimeoutError

But If I change async.sleep(3) to  async.sleep(0) the test passed. Not sure why

Also how to test url mapping works correctly? 

Thanks

Drew

[Andrew Godwin]

Couple of points:

- Did you install pytest-django? That should help the settings thing.

- There's a default 1-second timeout on get_response; pass timeout=4 to it and you should see that error go away.

We have a default timeout because otherwise we can't tell if an async app has died/crashed and it'd hang forever!

Andrew

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