Doc improvement is welcome. If you add request(1) before the expectComplete
it’s not undefined, then you are supposed to get it.

/Patrik
mån 19 feb. 2018 kl. 07:40 skrev Jakub Kahovec <jakub.kaho...@gmail.com>:

> I had another thought about this behaviour and two things came to my mind.
> First, it might be worth mentioning this somewhere in the documentation
> about testing as other users might also experience this and I think didn't
> see this mentioned anywhere in the docs. And second, is it safe to use 
> *expectComplete
> *at all if the behaviour is undefined and any such change might break the
> tests unexpectedly ?
>
> Jakub
>
> On Friday, February 16, 2018 at 9:55:45 PM UTC+1, Patrik Nordwall wrote:
>
>> It is allowed to ”delay” delivery of the complete signal when there is no
>> demand. This behavior is undefined, i.e. some stages deliver it
>> immediately, some only when demand is requested. This is as expected and in
>> such test you have to request enough to be sure to get the completed signal.
>>
>> /Patrik
>>
> fre 16 feb. 2018 kl. 09:02 skrev Jakub Kahovec <jakub....@gmail.com>:
>>
> Hi,
>>>
>>>
>>> when using Akka Streams (2.5.9)  I've recently bumped into a problem
>>> when testing a stream with a mapAsync stage. It unexpectedly ends with an
>>> assertion failing on *"timeout (3 seconds) during expectMsg while
>>> waiting for OnComplete"*
>>>
>>>
>>> To demonstrate it I've created a simple example.
>>>
>>>
>>> The code below works as expected.
>>>
>>>
>>> val sourceUnderTest = Source(1 to 2).mapAsync(2)(i => Future.successful(i
>>> * 2))
>>>
>>> val c = TestSubscriber.manualProbe[Int]()
>>> val p = sourceUnderTest.to(Sink.fromSubscriber(c)).run()
>>> val sub = c.expectSubscription()
>>>
>>> sub.request(2)
>>> c.expectNextN(2)   // List(2,4)
>>> c.expectComplete()   //
>>> akka.stream.testkit.TestSubscriber$ManualProbe@fc258b1
>>>
>>>
>>> However, when I add another mapping function (bold code), the test fails
>>> with a timeout. When I call additional c.request(1) (commented code) it
>>> ends correctly. So it looks like the mapping function adds an
>>> additional item into the stream, which seems strange.
>>>
>>>
>>> val sourceUnderTest = Source(1 to 2).mapAsync(2)(i => Future.successful(i
>>> * 2)*.**map(identity**)*)
>>>
>>> val c = TestSubscriber.manualProbe[Int]()
>>> val p = sourceUnderTest.to(Sink.fromSubscriber(c)).run()
>>> val sub = c.expectSubscription()
>>>
>>> sub.request(2)
>>> c.expectNextN(2)   // List(2,4)
>>> // c.request(1)
>>> c.expectComplete()   // ends with java.lang.AssertionError: assertion
>>> failed: timeout (3 seconds) during expectMsg while waiting for OnComplete
>>>
>>>
>>> Can anyone explain this strange behaviour ?
>>>
>>>
>>> Thanks
>>>
>>> Jakub
>>>
>>> --
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-- 
>>>>>>>>>>      Read the docs: http://akka.io/docs/
>>>>>>>>>>      Check the FAQ: 
>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
>>>>>>>>>>      Search the archives: https://groups.google.com/group/akka-user
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