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/*
* Copyright 2016-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.coroutines.flow
import kotlinx.coroutines.*
import kotlinx.coroutines.channels.*
import kotlin.test.*
class ChannelFlowTest : TestBase() {
@Test
fun testRegular() = runTest {
val flow = channelFlow {
assertTrue(offer(1))
assertTrue(offer(2))
assertTrue(offer(3))
}
assertEquals(listOf(1, 2, 3), flow.toList())
}
@Test
fun testBuffer() = runTest {
val flow = channelFlow {
assertTrue(offer(1))
assertTrue(offer(2))
assertFalse(offer(3))
}.buffer(1)
assertEquals(listOf(1, 2), flow.toList())
}
@Test
fun testConflated() = runTest {
val flow = channelFlow {
assertTrue(offer(1))
assertTrue(offer(2))
assertTrue(offer(3))
assertTrue(offer(4))
}.buffer(Channel.CONFLATED)
assertEquals(listOf(1, 4), flow.toList()) // two elements in the middle got conflated
}
@Test
fun testFailureCancelsChannel() = runTest {
val flow = channelFlow {
offer(1)
invokeOnClose {
expect(2)
}
}.onEach { throw TestException() }
expect(1)
assertFailsWith<TestException>(flow)
finish(3)
}
@Test
fun testFailureInSourceCancelsConsumer() = runTest {
val flow = channelFlow<Int> {
expect(2)
throw TestException()
}.onEach { expectUnreached() }
expect(1)
assertFailsWith<TestException>(flow)
finish(3)
}
@Test
fun testScopedCancellation() = runTest {
val flow = channelFlow<Int> {
expect(2)
launch(start = CoroutineStart.ATOMIC) {
hang { expect(3) }
}
throw TestException()
}.onEach { expectUnreached() }
expect(1)
assertFailsWith<TestException>(flow)
finish(4)
}
@Test
fun testMergeOneCoroutineWithCancellation() = runTest {
val flow = flowOf(1, 2, 3)
val f = flow.mergeOneCoroutine(flow).take(2)
assertEquals(listOf(1, 1), f.toList())
}
@Test
fun testMergeTwoCoroutinesWithCancellation() = runTest {
val flow = flowOf(1, 2, 3)
val f = flow.mergeTwoCoroutines(flow).take(2)
assertEquals(listOf(1, 1), f.toList())
}
private fun Flow<Int>.mergeTwoCoroutines(other: Flow<Int>): Flow<Int> = channelFlow {
launch {
collect { send(it); yield() }
}
launch {
other.collect { send(it) }
}
}
private fun Flow<Int>.mergeOneCoroutine(other: Flow<Int>): Flow<Int> = channelFlow {
launch {
collect { send(it); yield() }
}
other.collect { send(it); yield() }
}
@Test
@Ignore // #1374
fun testBufferWithTimeout() = runTest {
fun Flow<Int>.bufferWithTimeout(): Flow<Int> = channelFlow {
expect(2)
launch {
expect(3)
hang {
expect(5)
}
}
launch {
expect(4)
collect {
withTimeout(-1) {
send(it)
}
expectUnreached()
}
expectUnreached()
}
}
val flow = flowOf(1, 2, 3).bufferWithTimeout()
expect(1)
assertFailsWith<TimeoutCancellationException>(flow)
finish(6)
}
@Test
fun testChildCancellation() = runTest {
channelFlow {
val job = launch {
expect(2)
hang { expect(4) }
}
expect(1)
yield()
expect(3)
job.cancelAndJoin()
send(5)
}.collect {
expect(it)
}
finish(6)
}
@Test
fun testClosedPrematurely() = runTest(unhandled = listOf({ e -> e is ClosedSendChannelException })) {
val outerScope = this
val flow = channelFlow {
// ~ callback-based API, no children
outerScope.launch(Job()) {
expect(2)
send(1)
expectUnreached()
}
expect(1)
}
assertEquals(emptyList(), flow.toList())
finish(3)
}
@Test
fun testNotClosedPrematurely() = runTest {
val outerScope = this
val flow = channelFlow {
// ~ callback-based API
outerScope.launch(Job()) {
expect(2)
send(1)
close()
}
expect(1)
awaitClose()
}
assertEquals(listOf(1), flow.toList())
finish(3)
}
}
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