what does it mean if my test fails with java lang IllegalSta kotlinlang #coroutines

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Title

c

christophsturm

05/11/2020, 7:09 PM

what does it mean if my test fails with “java.lang.IllegalStateException: This job has not completed yet” when i use runBlockingTest? it works with runBlocking

is that a bug in runblocking test or does it do more checks and indicate a bug in my code?

z

zak.taccardi

05/11/2020, 7:11 PM

https://github.com/Kotlin/kotlinx.coroutines/issues/1531

if your test works with

runBlocking

- prefer

runBlocking

as it is less complex

s

streetsofboston

05/11/2020, 7:12 PM

Not always a bug. I noticed this: The runBlockingTest forwards (virtual) time automatically. If your actual async/suspend code would run forever (never finish), the runBlockingTest would need to (auto)forward time to infinity (Long.MAX_VALUE). If this is the casem your test has ended without the job having finished.

E.g.

runBlockingTest {
    val flow = callbackFlow<Int> {
        awaitClose {}
    }
    flow.collect { ... }
}

^^^ This would show that error, since the call to collect will never resume.

c

christophsturm

05/11/2020, 7:34 PM

is it a problem if i create my database connection in a setup method with runBlocking, and then not close that connection in my test that uses

runBlockingTest

? i close it later in a tear down method

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