Add server command queue to ChannelsLiveServerTestCase to allow clean…

[johanneswilm]

This is a possible solution for #2208 in combination with johanneswilm/django-channels-contenttype-test#1

[carltongibson]

Hey @johanneswilm. Thanks for this.

Initial thought: it looks overly complex. Not a criticism per se. More, I think we made a misstep, and that's an indication of that.

I'll have a play over the holidays

[johanneswilm]

I agree that it looks complex. I tried to make it as simple as possible and change as little as possible. But there are other solutions - such as rolling back the changes introduced in cd44771 to make the entire test class use the same Daphne process. I am not sure what the benefits of doing that are and whether those benefits outweigh issues such as this one.

[carltongibson]

No me neither currently 😜 Let me think about it. Thanks for the efforts. Really helpful