Testing Channels database data missing in Consumer

[Daniel Gilge]

Hi,

this question is related to Channels 2.0, Django 2.0, pytest 3.4, pytest-django 3.1 and pytest-asyncio 0.8.

I created a pytest:

@pytest.fixture
def db_with_obj(db):
    factories.MyModelFactory()

@pytest.mark.asyncio
async def test_something(db_with_obj):
    print(models.MyModelFactory.objects.all())
    obj = models.MyModelFactory.objects.first()
    communicator = WebsocketCommunicator(MyConsumer, 'ws/')
    connected, subprotocol = await communicator.connect()
    assert connected
    await communicator.send_to(text_data=json.dumps({
        'id': obj.pk,
        'content': 'my content',
    }))
    response = await communicator.receive_from()
    assert response == 'my content'
    await communicator.disconnect()

print gives me <QuerySet [<MyModel: 1>]>

Here my Consumer code:

class MyConsumer(WebsocketConsumer):
    def receive(self, text_data=None, bytes_data=None):
        print(models.MyModel.objects.all())
        # ...

print gives me <QuerySet []>

I don't know what I'm doing wrong. I didn't use both, pytest and Python async code, before. Therefore I don't know where to look for the solution, though I think it's easy to solve. Any hint appreciated.

Thanks :)

[Andrew Godwin]

I'm not quite sure either. Does the test setup work if you are not in async mode?

Andrew

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[Daniel Gilge]

Hi Andrew,

thanks for your reply.

This test is passing (using the same packages):

def test_fixture(db_with_segment, admin_client):
    assert models.MyModel.objects.count() == 1
    response = admin_client.get('/api/my_model/list/')
    assert len(response.json()['results']) == 1

I tried to write a simpler async test with asyncio.wait but I didn't complete it so far.

I thought to just write ChannelsLiveServerTestCase tests but I couldn't manage to serve static files there. (Both, setting static_handler = StaticFilesHandler – what StaticLiveServerTestCase does – and running collectstatic didn't work.)

Finally I ran my development server and did some tests in the browser console. There it works. I'll continue coding using this technique to "test" my code and try to find a solution for the other (real) tests as I have time.

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[Andrew Godwin]

Interesting. I did note that you called ORM methods in an async context, which is not how you are supposed to do it, but I also believe that should work. Maybe try splitting the ORM methods into a separate function and awaiting it using SyncToAsync?

As for the staticfiles in live test case problem, I have opened a ticket for that: https://github.com/django/channels/issues/880

Andrew

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