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/*
* Copyright 2016-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.coroutines.channels
import kotlinx.coroutines.*
import kotlinx.coroutines.internal.*
import kotlinx.coroutines.selects.*
import kotlin.test.*
/**
* Tests for failures inside `onUndeliveredElement` handler in [Channel].
*/
class ChannelUndeliveredElementFailureTest : TestBase() {
private val item = "LOST"
private val onCancelFail: (String) -> Unit = { throw TestException(it) }
private val shouldBeUnhandled: List<(Throwable) -> Boolean> = listOf({ it.isElementCancelException() })
private fun Throwable.isElementCancelException() =
this is UndeliveredElementException && cause is TestException && cause!!.message == item
@Test
fun testSendCancelledFail() = runTest(unhandled = shouldBeUnhandled) {
val channel = Channel(onUndeliveredElement = onCancelFail)
val job = launch(start = CoroutineStart.UNDISPATCHED) {
channel.send(item)
expectUnreached()
}
job.cancel()
}
@Test
fun testSendSelectCancelledFail() = runTest(unhandled = shouldBeUnhandled) {
val channel = Channel(onUndeliveredElement = onCancelFail)
val job = launch(start = CoroutineStart.UNDISPATCHED) {
select {
channel.onSend(item) {
expectUnreached()
}
}
}
job.cancel()
}
@Test
fun testReceiveCancelledFail() = runTest(unhandled = shouldBeUnhandled) {
val channel = Channel(onUndeliveredElement = onCancelFail)
val job = launch(start = CoroutineStart.UNDISPATCHED) {
channel.receive()
expectUnreached() // will be cancelled before it dispatches
}
channel.send(item)
job.cancel()
}
@Test
fun testReceiveSelectCancelledFail() = runTest(unhandled = shouldBeUnhandled) {
val channel = Channel(onUndeliveredElement = onCancelFail)
val job = launch(start = CoroutineStart.UNDISPATCHED) {
select<Unit> {
channel.onReceive {
expectUnreached()
}
}
expectUnreached() // will be cancelled before it dispatches
}
channel.send(item)
job.cancel()
}
@Test
fun testReceiveCatchingCancelledFail() = runTest(unhandled = shouldBeUnhandled) {
val channel = Channel(onUndeliveredElement = onCancelFail)
val job = launch(start = CoroutineStart.UNDISPATCHED) {
channel.receiveCatching()
expectUnreached() // will be cancelled before it dispatches
}
channel.send(item)
job.cancel()
}
@Test
fun testReceiveOrClosedSelectCancelledFail() = runTest(unhandled = shouldBeUnhandled) {
val channel = Channel(onUndeliveredElement = onCancelFail)
val job = launch(start = CoroutineStart.UNDISPATCHED) {
select<Unit> {
channel.onReceiveCatching {
expectUnreached()
}
}
expectUnreached() // will be cancelled before it dispatches
}
channel.send(item)
job.cancel()
}
@Test
fun testHasNextCancelledFail() = runTest(unhandled = shouldBeUnhandled) {
val channel = Channel(onUndeliveredElement = onCancelFail)
val job = launch(start = CoroutineStart.UNDISPATCHED) {
channel.iterator().hasNext()
expectUnreached() // will be cancelled before it dispatches
}
channel.send(item)
job.cancel()
}
@Test
fun testChannelCancelledFail() = runTest(expected = { it.isElementCancelException()}) {
val channel = Channel(1, onUndeliveredElement = onCancelFail)
channel.send(item)
channel.cancel()
expectUnreached()
}
}
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