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/*
* Copyright 2016-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.coroutines.reactor
import kotlinx.coroutines.*
import kotlinx.coroutines.channels.*
import kotlinx.coroutines.flow.*
import kotlinx.coroutines.reactive.*
import org.junit.Test
import kotlin.test.*
class FluxTest : TestBase() {
@Test
fun testBasicSuccess() = runBlocking {
expect(1)
val flux = flux(currentDispatcher()) {
expect(4)
send("OK")
}
expect(2)
flux.subscribe { value ->
expect(5)
assertEquals("OK", value)
}
expect(3)
yield() // to started coroutine
finish(6)
}
@Test
fun testBasicFailure() = runBlocking {
expect(1)
val flux = flux<String>(currentDispatcher()) {
expect(4)
throw RuntimeException("OK")
}
expect(2)
flux.subscribe({
expectUnreached()
}, { error ->
expect(5)
assertTrue(error is RuntimeException)
assertEquals("OK", error.message)
})
expect(3)
yield() // to started coroutine
finish(6)
}
@Test
fun testBasicUnsubscribe() = runBlocking {
expect(1)
val flux = flux<String>(currentDispatcher()) {
expect(4)
yield() // back to main, will get cancelled
expectUnreached()
}
expect(2)
val sub = flux.subscribe({
expectUnreached()
}, {
expectUnreached()
})
expect(3)
yield() // to started coroutine
expect(5)
sub.dispose() // will cancel coroutine
yield()
finish(6)
}
@Test
fun testNotifyOnceOnCancellation() = runTest {
expect(1)
val observable =
flux(currentDispatcher()) {
expect(5)
send("OK")
try {
delay(Long.MAX_VALUE)
} catch (e: CancellationException) {
expect(11)
}
}
.doOnNext {
expect(6)
assertEquals("OK", it)
}
.doOnCancel {
expect(10) // notified once!
}
expect(2)
val job = launch(start = CoroutineStart.UNDISPATCHED) {
expect(3)
observable.collect {
expect(8)
assertEquals("OK", it)
}
}
expect(4)
yield() // to observable code
expect(7)
yield() // to consuming coroutines
expect(9)
job.cancel()
job.join()
finish(12)
}
@Test
fun testFailingConsumer() = runTest {
val pub = flux(currentDispatcher()) {
repeat(3) {
expect(it + 1) // expect(1), expect(2) *should* be invoked
send(it)
}
}
try {
pub.collect {
throw TestException()
}
} catch (e: TestException) {
finish(3)
}
}
@Test
fun testIllegalArgumentException() {
assertFailsWith<IllegalArgumentException> { flux<Int>(Job()) { } }
}
@Test
fun testLeakedException() = runBlocking {
// Test exception is not reported to global handler
val flow = flux<Unit> { throw TestException() }.asFlow()
repeat(2000) {
combine(flow, flow) { _, _ -> Unit }
.catch {}
.collect { }
}
}
/** Tests that `trySend` doesn't throw in `flux`. */
@Test
fun testTrySendNotThrowing() = runTest {
var producerScope: ProducerScope<Int>? = null
expect(1)
val flux = flux<Int>(Dispatchers.Unconfined) {
producerScope = this
expect(3)
delay(Long.MAX_VALUE)
}
val job = launch(start = CoroutineStart.UNDISPATCHED) {
expect(2)
flux.awaitFirstOrNull()
expectUnreached()
}
job.cancel()
expect(4)
val result = producerScope!!.trySend(1)
assertTrue(result.isFailure)
finish(5)
}
/** Tests that all methods on `flux` fail without closing the channel when attempting to emit `null`. */
@Test
fun testEmittingNull() = runTest {
val flux = flux {
assertFailsWith<NullPointerException> { send(null) }
assertFailsWith<NullPointerException> { trySend(null) }
@Suppress("DEPRECATION")
assertFailsWith<NullPointerException> { offer(null) }
send("OK")
}
assertEquals("OK", flux.awaitFirstOrNull())
}
}
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