Hello there. Is there any smart way to test (in junits) if there’s no blocking IO calls inside a sus...

# coroutines

[Jakub Gwóźdź]

Hello there. Is there any smart way to test (in junits) if there’s no blocking IO calls inside a suspending function? Let’s say I can mockk a potentially blocking dependency (in my case it would be org.apache.kafka.clients.producer.KafkaProducer#send(...) which returns some Future<...> )

[Dmitry Khalanskiy [JB]]

https://kotlinlang.org/api/kotlinx.coroutines/kotlinx-coroutines-debug/
Ctrl+F "blockhound"

[Jakub Gwóźdź]

❤️

[Jakub Gwóźdź]

Thank you!

[Jakub Gwóźdź]

oh, unfortunately BlockHoud does not raise alarm on Future.get() 😞

[Dmitry Khalanskiy [JB]]

Well, Future.get itself is not necessarily blocking. But if the Future.get call actually makes the thread sleep, I think BlockHound will react. At least I don't remember any explicit exceptions being made for Future.get, and I don't think they would make sense.

[Jakub Gwóźdź]

yeah, I think now it was my mistake on guessing how/when BlockHound would intervene and I simply didn’t give it a chance to raise anything 🙂
And while I solved my whole problem with rethinking approach, thank you for pointing me to this BlockHound project, for sure it will come handy another time 🙂