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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.rx2
import io.reactivex.*
import io.reactivex.disposables.*
import io.reactivex.exceptions.*
import io.reactivex.internal.functions.Functions.*
import kotlinx.coroutines.*
import kotlinx.coroutines.CancellationException
import org.junit.*
import org.junit.Test
import java.util.concurrent.*
import kotlin.test.*
class MaybeTest : TestBase() {
@Before
fun setup() {
ignoreLostThreads("RxComputationThreadPool-", "RxCachedWorkerPoolEvictor-", "RxSchedulerPurge-")
}
@Test
fun testBasicSuccess() = runBlocking {
expect(1)
val maybe = rxMaybe(currentDispatcher()) {
expect(4)
"OK"
}
expect(2)
maybe.subscribe { value ->
expect(5)
assertEquals("OK", value)
}
expect(3)
yield() // to started coroutine
finish(6)
}
@Test
fun testBasicEmpty() = runBlocking {
expect(1)
val maybe = rxMaybe(currentDispatcher()) {
expect(4)
null
}
expect(2)
maybe.subscribe (emptyConsumer(), ON_ERROR_MISSING, {
expect(5)
})
expect(3)
yield() // to started coroutine
finish(6)
}
@Test
fun testBasicFailure() = runBlocking {
expect(1)
val maybe = rxMaybe(currentDispatcher()) {
expect(4)
throw RuntimeException("OK")
}
expect(2)
maybe.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 maybe = rxMaybe(currentDispatcher()) {
expect(4)
yield() // back to main, will get cancelled
expectUnreached()
}
expect(2)
// nothing is called on a disposed rx2 maybe
val sub = maybe.subscribe({
expectUnreached()
}, {
expectUnreached()
})
expect(3)
yield() // to started coroutine
expect(5)
sub.dispose() // will cancel coroutine
yield()
finish(6)
}
@Test
fun testMaybeNoWait() {
val maybe = rxMaybe {
"OK"
}
checkMaybeValue(maybe) {
assertEquals("OK", it)
}
}
@Test
fun testMaybeAwait() = runBlocking {
assertEquals("OK", Maybe.just("O").awaitSingleOrNull() + "K")
assertEquals("OK", Maybe.just("O").awaitSingle() + "K")
}
@Test
fun testMaybeAwaitForNull(): Unit = runBlocking {
assertNull(Maybe.empty<String>().awaitSingleOrNull())
assertFailsWith<NoSuchElementException> { Maybe.empty<String>().awaitSingle() }
}
/** Tests that calls to [awaitSingleOrNull] throw [CancellationException] and dispose of the subscription when their
* [Job] is cancelled. */
@Test
fun testMaybeAwaitCancellation() = runTest {
expect(1)
val maybe = MaybeSource<Int> { s ->
s.onSubscribe(object: Disposable {
override fun dispose() { expect(4) }
override fun isDisposed(): Boolean { expectUnreached(); return false }
})
}
val job = launch(start = CoroutineStart.UNDISPATCHED) {
try {
expect(2)
maybe.awaitSingleOrNull()
} catch (e: CancellationException) {
expect(5)
throw e
}
}
expect(3)
job.cancelAndJoin()
finish(6)
}
@Test
fun testMaybeEmitAndAwait() {
val maybe = rxMaybe {
Maybe.just("O").awaitSingleOrNull() + "K"
}
checkMaybeValue(maybe) {
assertEquals("OK", it)
}
}
@Test
fun testMaybeWithDelay() {
val maybe = rxMaybe {
Observable.timer(50, TimeUnit.MILLISECONDS).map { "O" }.awaitSingle() + "K"
}
checkMaybeValue(maybe) {
assertEquals("OK", it)
}
}
@Test
fun testMaybeException() {
val maybe = rxMaybe {
Observable.just("O", "K").awaitSingle() + "K"
}
checkErroneous(maybe) {
assert(it is IllegalArgumentException)
}
}
@Test
fun testAwaitFirst() {
val maybe = rxMaybe {
Observable.just("O", "#").awaitFirst() + "K"
}
checkMaybeValue(maybe) {
assertEquals("OK", it)
}
}
@Test
fun testAwaitLast() {
val maybe = rxMaybe {
Observable.just("#", "O").awaitLast() + "K"
}
checkMaybeValue(maybe) {
assertEquals("OK", it)
}
}
@Test
fun testExceptionFromObservable() {
val maybe = rxMaybe {
try {
Observable.error<String>(RuntimeException("O")).awaitFirst()
} catch (e: RuntimeException) {
Observable.just(e.message!!).awaitLast() + "K"
}
}
checkMaybeValue(maybe) {
assertEquals("OK", it)
}
}
@Test
fun testExceptionFromCoroutine() {
val maybe = rxMaybe<String> {
throw IllegalStateException(Observable.just("O").awaitSingle() + "K")
}
checkErroneous(maybe) {
assert(it is IllegalStateException)
assertEquals("OK", it.message)
}
}
@Test
fun testCancelledConsumer() = runTest {
expect(1)
val maybe = rxMaybe(currentDispatcher()) {
expect(4)
try {
delay(Long.MAX_VALUE)
} catch (e: CancellationException) {
expect(6)
}
42
}
expect(2)
val timeout = withTimeoutOrNull(100) {
expect(3)
maybe.collect {
expectUnreached()
}
expectUnreached()
}
assertNull(timeout)
expect(5)
yield() // must cancel code inside maybe!!!
finish(7)
}
/** Tests the simple scenario where the Maybe doesn't output a value. */
@Test
fun testMaybeCollectEmpty() = runTest {
expect(1)
Maybe.empty<Int>().collect {
expectUnreached()
}
finish(2)
}
/** Tests the simple scenario where the Maybe doesn't output a value. */
@Test
fun testMaybeCollectSingle() = runTest {
expect(1)
Maybe.just("OK").collect {
assertEquals("OK", it)
expect(2)
}
finish(3)
}
/** Tests the behavior of [collect] when the Maybe raises an error. */
@Test
fun testMaybeCollectThrowingMaybe() = runTest {
expect(1)
try {
Maybe.error<Int>(TestException()).collect {
expectUnreached()
}
} catch (e: TestException) {
expect(2)
}
finish(3)
}
/** Tests the behavior of [collect] when the action throws. */
@Test
fun testMaybeCollectThrowingAction() = runTest {
expect(1)
try {
Maybe.just("OK").collect {
expect(2)
throw TestException()
}
} catch (e: TestException) {
expect(3)
}
finish(4)
}
@Test
fun testSuppressedException() = runTest {
val maybe = rxMaybe(currentDispatcher()) {
launch(start = CoroutineStart.ATOMIC) {
throw TestException() // child coroutine fails
}
try {
delay(Long.MAX_VALUE)
} finally {
throw TestException2() // but parent throws another exception while cleaning up
}
}
try {
maybe.awaitSingleOrNull()
expectUnreached()
} catch (e: TestException) {
assertTrue(e.suppressed[0] is TestException2)
}
}
@Test
fun testUnhandledException() = runTest {
expect(1)
var disposable: Disposable? = null
val handler = { e: Throwable ->
assertTrue(e is UndeliverableException && e.cause is TestException)
expect(5)
}
val maybe = rxMaybe(currentDispatcher()) {
expect(4)
disposable!!.dispose() // cancel our own subscription, so that delay will get cancelled
try {
delay(Long.MAX_VALUE)
} finally {
throw TestException() // would not be able to handle it since mono is disposed
}
}
withExceptionHandler(handler) {
maybe.subscribe(object : MaybeObserver<Unit> {
override fun onSubscribe(d: Disposable) {
expect(2)
disposable = d
}
override fun onComplete() {
expectUnreached()
}
override fun onSuccess(t: Unit) {
expectUnreached()
}
override fun onError(t: Throwable) {
expectUnreached()
}
})
expect(3)
yield() // run coroutine
finish(6)
}
}
@Test
fun testFatalExceptionInSubscribe() = runTest {
val handler = { e: Throwable ->
assertTrue(e is UndeliverableException && e.cause is LinkageError)
expect(2)
}
withExceptionHandler(handler) {
rxMaybe(Dispatchers.Unconfined) {
expect(1)
42
}.subscribe { throw LinkageError() }
finish(3)
}
}
@Test
fun testFatalExceptionInSingle() = runTest {
rxMaybe(Dispatchers.Unconfined) {
throw LinkageError()
}.subscribe({ expectUnreached() }, { expect(1); assertTrue(it is LinkageError) })
finish(2)
}
}
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