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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 ChannelBuildersFlowTest : TestBase() {
@Test
fun testChannelConsumeAsFlow() = runTest {
val channel = produce {
repeat(10) {
send(it + 1)
}
}
val flow = channel.consumeAsFlow()
assertEquals(55, flow.sum())
assertFailsWith<IllegalStateException> { flow.collect() }
}
@Test
fun testChannelReceiveAsFlow() = runTest {
val channel = produce {
repeat(10) {
send(it + 1)
}
}
val flow = channel.receiveAsFlow()
assertEquals(55, flow.sum())
assertEquals(emptyList(), flow.toList())
}
@Test
fun testConsumeAsFlowCancellation() = runTest {
val channel = produce(NonCancellable) { // otherwise failure will cancel scope as well
repeat(10) {
send(it + 1)
}
throw TestException()
}
val flow = channel.consumeAsFlow()
assertEquals(15, flow.take(5).sum())
// the channel should have been canceled, even though took only 5 elements
assertTrue(channel.isClosedForReceive)
assertFailsWith<IllegalStateException> { flow.collect() }
}
@Test
fun testReceiveAsFlowCancellation() = runTest {
val channel = produce(NonCancellable) { // otherwise failure will cancel scope as well
repeat(10) {
send(it + 1)
}
throw TestException()
}
val flow = channel.receiveAsFlow()
assertEquals(15, flow.take(5).sum()) // sum of first 5
assertEquals(40, flow.take(5).sum()) // sum the rest 5
assertFailsWith<TestException> { flow.sum() } // exception in the rest
}
@Test
fun testConsumeAsFlowException() = runTest {
val channel = produce(NonCancellable) { // otherwise failure will cancel scope as well
repeat(10) {
send(it + 1)
}
throw TestException()
}
val flow = channel.consumeAsFlow()
assertFailsWith<TestException> { flow.sum() }
assertFailsWith<IllegalStateException> { flow.collect() }
}
@Test
fun testReceiveAsFlowException() = runTest {
val channel = produce(NonCancellable) { // otherwise failure will cancel scope as well
repeat(10) {
send(it + 1)
}
throw TestException()
}
val flow = channel.receiveAsFlow()
assertFailsWith<TestException> { flow.sum() }
assertFailsWith<TestException> { flow.collect() } // repeated collection -- same exception
}
@Test
fun testConsumeAsFlowProduceFusing() = runTest {
val channel = produce { send("OK") }
val flow = channel.consumeAsFlow()
assertSame(channel, flow.produceIn(this))
assertFailsWith<IllegalStateException> { flow.produceIn(this) }
channel.cancel()
}
@Test
fun testReceiveAsFlowProduceFusing() = runTest {
val channel = produce { send("OK") }
val flow = channel.receiveAsFlow()
assertSame(channel, flow.produceIn(this))
assertSame(channel, flow.produceIn(this)) // can use produce multiple times
channel.cancel()
}
@Test
fun testConsumeAsFlowProduceBuffered() = runTest {
expect(1)
val channel = produce {
expect(3)
(1..10).forEach { send(it) }
expect(4) // produces everything because of buffering
}
val flow = channel.consumeAsFlow().buffer() // request buffering
expect(2) // producer is not running yet
val result = flow.produceIn(this)
// run the flow pipeline until it consumes everything into buffer
while (!channel.isClosedForReceive) yield()
expect(5) // produced had done running (buffered stuff)
assertNotSame(channel, result)
assertFailsWith<IllegalStateException> { flow.produceIn(this) }
// check that we received everything
assertEquals((1..10).toList(), result.toList())
finish(6)
}
@Test
fun testProduceInAtomicity() = runTest {
val flow = flowOf(1).onCompletion { expect(2) }
val scope = CoroutineScope(wrapperDispatcher())
flow.produceIn(scope)
expect(1)
scope.cancel()
scope.coroutineContext[Job]?.join()
finish(3)
}
}
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