[Async-sig] async testing question

[Alex Grönholm]

For asyncio, you can write your test functions as coroutines if you use 
pytest-asyncio. You can even write test fixtures using coroutines. 
Mocking coroutine functions can be done using asynctest, although I've 
found that library a bit buggy.


Chris Jerdonek kirjoitti 02.07.2017 klo 00:00:
> On Sat, Jul 1, 2017 at 1:42 PM, Nathaniel Smith <njs at pobox.com> wrote:
>> On Jul 1, 2017 3:11 AM, "Chris Jerdonek" <chris.jerdonek at gmail.com> wrote:
>> Is there a way to write a test case to check that task.cancel() would
>> behave correctly if, say, do_things() is waiting at the line
>> do_more()?
>>
>> One possibility for handling this case with a minimum of mocking would be to
>> hook do_more so that it calls task.cancel and then calls the regular
>> do_more.
>>
>> Beyond that it depends on what the actual functions are, I guess. If do_more
>> naturally blocks under some conditions then you might be able to set up
>> those conditions and then call cancel. Or you could try experimenting with
>> tests that call sleep(0) a fixed number of times before issuing the cancel,
>> and repeat with different iteration counts to find different cancel points.
> Thanks, Nathaniel. The following would be overkill in my case, but
> your suggestion makes me wonder if it would make sense for there to be
> testing tools that have functions to do things like "run the event
> loop until <this future> is at <this line of code>." Do such things
> exist? This is a little bit related to what Dima was saying about
> tools.
>
> --Chris
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