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

Post by 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.
@pytest.mark.asyncio
communicator = HttpCommunicator(BasicHttpConsumer, "GET", "asynchttp")
response = await communicator.get_response()
assert response["status"] == 200
assert response["body"] == b"OK"
I run it with command "pytest xxxx.py"
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.
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "MODULE_PATH_TO.settings")
self = <async_timeout.timeout object at 0x7fe427eca470>, exc_type = <class
'concurrent.futures._base.CancelledError'>
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
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