Unable to collect code coverage when using `ChannelsLiveServerTestCase`

[kierangillblueberry]

Unable to collect code coverage when using `ChannelsLiveServerTestCase`

[carltongibson]

Ok, well I can't see anything in obvious... there's a lot going on in the repo so I guess trying to reduce it would be the next phase.

I can see if I can find it next time I'm looking this area.

[carltongibson]

Thanks for the report. I'm not immediately sure what the problem is. Have you explored coverage's concurrency option?

[kierangillblueberry]

I have. It wasn't clear to me which Daphne used so I tried every concurrency option in their docs. I also adding coverage directly to sitecustomize.py as recommended in the docs but did not make any headway.

There are more details in the reproduction's README.md.

[carltongibson]

I'd imagine you'd need a multi-value like multiprocessing,thread 🤔

[kierangillblueberry]

I just tried every combination of the concurrency options available to me:

multiprocessing,greenlet,thread
multiprocessing,greenlet
multiprocessing,thread
greenlet,multiprocessing
greenlet,thread
thread,multiprocessing
thread,greenlet

I am still unable to collect coverage. gevent and eventlet weren't dependencies of anything I am using so I didn't try them.

[kierangillblueberry]

@carltongibson I've created a smaller reproduction here: https://github.com/kierangillblueberry/code-coverage-ChannelsLiveServerTestCase_small

• README.md
• tests.py
• views.py
• run LiveServerTestCase tests
• runChannelsLiveServerTestCase tests

[carltongibson]

Thanks @kierangillblueberry 👀

[kierangillblueberry]

Hey @carltongibson, following up on this. I can also take a stab at this fix but I'm not sure where to start. Any pointers would be helpful! Also happy to hop on a call if you think it'd be helpful.

[carltongibson]

Hi @kierangillblueberry, I haven't had a chance to sit down with it to be honest. First pass would be to see if we can pick down exactly what's happening.

[carltongibson]

parallel = True

Q: does coverage work running with just a single process (I guess yes)?