Testing Channels 2.0 consumers - problem with routing

[Azamat Galimzhanov]

Hello,

I'm setting up an auctions application using channels and websockets. When 
I'm running the server the code works just fine, troubles arise when I'm 
trying to test my app.

asgiref==2.1.3
daphne==2.0.2
Django==2.0.2
channels==2.0.1
channels-redis==2.0.2
pytest==3.4.0
pytest-asyncio==0.8.0

a bunch of other stuff, but I think that's it for relevant libraries.

Here is my consumer:

class AuctionConsumer(WebsocketConsumer):
    @property
    @lru_cache(maxsize=None)
    def group_name(self):
        auction_id = self.scope['url_route']['kwargs']['auction_id']
        return 'auction_{}'.format(auction_id)

    def connect(self):
        AsyncToSync(self.channel_layer.group_add)(self.group_name, 
self.channel_name)
        self.accept()


Here is my routing:

application = ProtocolTypeRouter({
    'websocket': URLRouter([
        path("auctions/<auction_id>/", AuctionConsumer),
    ]),
})


And here is my test:


@pytest.mark.asyncio
async def test_auction_consumer(mocker):
    communicator = WebsocketCommunicator(AuctionConsumer, 'auctions/1/')
    connected, subprotocol = await communicator.connect()
    assert connected
    # Test sending text
    await communicator.send_to(text_data='1')
    response = await communicator.receive_from()
    assert response == '1'
    # Close
    await communicator.disconnect()



I'm running into the following problem;

    @property
    @lru_cache(maxsize=None)
    def group_name(self):
>       auction_id = self.scope['url_route']['kwargs']['auction_id']
E       KeyError: 'url_route'

I tried mocking at the top of my test:

    group_name = mocker.patch('auctions.consumers.AuctionConsumer.group_name')
    group_name.return_value = 'auction'


But then I run into:

    def valid_group_name(self, name):
        if self.match_type_and_length(name):
            if bool(self.group_name_regex.match(name)):
                return True
        raise TypeError(
            "Group name must be a valid unicode string containing only 
ASCII " +
>           "alphanumerics, hyphens, or periods."
        )
E       TypeError: Group name must be a valid unicode string containing 
only ASCII alphanumerics, hyphens, or periods.


I also tried:

scope = mocker.patch('auctions.consumers.AuctionConsumer.scope')
scope.return_value = {'url_route': {}}


But that got me:

        if not self.create and original is DEFAULT:
            raise AttributeError(
>               "%s does not have the attribute %r" % (target, name)
            )
E           AttributeError: <class 'auctions.consumers.AuctionConsumer'> 
does not have the attribute 'scope'


At this point I'm out of ideas. Anything I should try?

Thanks in advance.

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