For testing purposes, I need a flow that never com...

# coroutines

[tseisel]

For testing purposes, I need a flow that never completes (similar to Flowable.never())
Is something like this correct ?

object NeverFlow : Flow<Nothing> {
    override suspend fun collect(collector: FlowCollector<Nothing>) {
        delay(Long.MAX_VALUE)
    }
}

[streetsofboston]

val flow: Flow<Nothing> = flow {
        suspendCancellableCoroutine { /* do nothing */ }
    }

[streetsofboston]

Basically, replace the delay(Long.MAX_VALUE) call with an empty suspendCancellableCoroutine call

[elizarov]

Actually, that is exactly what delay would do if you call it with Long.MAX_VALUE — it assumes you suspend forever.

[streetsofboston]

Had some issues with unit-testing code that uses delay(Long.MAX_VALUE), due to Long.MAX_VALUE rolling over to a negative value of you add just 1 millisecond. Maybe that has been fixed in the latest coroutines-test libraries. If not, calling delay(Long.MAX_VALUE - 1) may still have that roll-over issue...