I’m wondering if I'm seeing a problem related to 
https://github.com/akka/akka/issues/23111 
<https://github.com/akka/akka/issues/23111>. 

My `Source.single` completes quite quickly. I also have a custom stage with an 
async callback. I have observed that the stage registers as being completed 
while the async callback hasn't been serviced. It could absolutely be something 
wrong with my test case. I'm still not clear on why my custom stage is 
registered as being completed, although I don’t see it being because of the 
materialiser shutting down.

If I concat an extra ByteString onto the Source.single then I don’t see the 
issue. Perhaps some race condition then…

Here’s my (uncomfortable) workaround: 
https://github.com/huntc/landlord/blob/3785b47a2f770ede44351b588e3b53a7cdf7d013/landlordd/daemon/src/test/scala/com/github/huntc/landlord/JvmExecutorSpec.scala#L53-L60
 
<https://github.com/huntc/landlord/blob/3785b47a2f770ede44351b588e3b53a7cdf7d013/landlordd/daemon/src/test/scala/com/github/huntc/landlord/JvmExecutorSpec.scala#L53-L60>

Thanks for helping me gain further insight into what’s going on.

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