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/*
* Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.coroutines.tasks
import com.google.android.gms.tasks.*
import kotlinx.coroutines.*
import org.junit.*
import org.junit.Test
import java.util.concurrent.locks.*
import kotlin.concurrent.*
import kotlin.test.*
class TaskTest : TestBase() {
@Before
fun setup() {
ignoreLostThreads("ForkJoinPool.commonPool-worker-")
}
@Test
fun testCompletedDeferredAsTask() = runTest {
expect(1)
val deferred = async(start = CoroutineStart.UNDISPATCHED) {
expect(2) // Completed immediately
"OK"
}
expect(3)
val task = deferred.asTask()
assertEquals("OK", task.await())
finish(4)
}
@Test
fun testDeferredAsTask() = runTest {
expect(1)
val deferred = async {
expect(3) // Completed later
"OK"
}
expect(2)
val task = deferred.asTask()
assertEquals("OK", task.await())
finish(4)
}
@Test
fun testCancelledAsTask() {
val deferred = GlobalScope.async {
delay(100)
}.apply { cancel() }
val task = deferred.asTask()
try {
runTest { task.await() }
} catch (e: Exception) {
assertTrue(e is CancellationException)
assertTrue(task.isCanceled)
}
}
@Test
fun testThrowingAsTask() {
val deferred = GlobalScope.async<Int> {
throw TestException("Fail")
}
val task = deferred.asTask()
runTest(expected = { it is TestException }) {
task.await()
}
}
@Test
fun testStateAsTask() = runTest {
val lock = ReentrantLock().apply { lock() }
val deferred: Deferred<Int> = Tasks.call {
lock.withLock { 42 }
}.asDeferred()
assertFalse(deferred.isCompleted)
lock.unlock()
assertEquals(42, deferred.await())
assertTrue(deferred.isCompleted)
}
@Test
fun testTaskAsDeferred() = runTest {
val deferred = Tasks.forResult(42).asDeferred()
assertEquals(42, deferred.await())
}
@Test
fun testNullResultTaskAsDeferred() = runTest {
assertNull(Tasks.forResult(null).asDeferred().await())
}
@Test
fun testCancelledTaskAsDeferred() = runTest {
val deferred = Tasks.forCanceled<Int>().asDeferred()
assertTrue(deferred.isCancelled)
try {
deferred.await()
fail("deferred.await() should be cancelled")
} catch (e: Exception) {
assertTrue(e is CancellationException)
}
}
@Test
fun testFailedTaskAsDeferred() = runTest {
val deferred = Tasks.forException<Int>(TestException("something went wrong")).asDeferred()
assertTrue(deferred.isCancelled && deferred.isCompleted)
val completionException = deferred.getCompletionExceptionOrNull()!!
assertTrue(completionException is TestException)
assertEquals("something went wrong", completionException.message)
try {
deferred.await()
fail("deferred.await() should throw an exception")
} catch (e: Exception) {
assertTrue(e is TestException)
assertEquals("something went wrong", e.message)
}
}
@Test
fun testFailingTaskAsDeferred() = runTest {
val lock = ReentrantLock().apply { lock() }
val deferred: Deferred<Int> = Tasks.call {
lock.withLock { throw TestException("something went wrong") }
}.asDeferred()
assertFalse(deferred.isCompleted)
lock.unlock()
try {
deferred.await()
fail("deferred.await() should throw an exception")
} catch (e: Exception) {
assertTrue(e is TestException)
assertEquals("something went wrong", e.message)
assertSame(e.cause, deferred.getCompletionExceptionOrNull()) // debug mode stack augmentation
}
}
@Test
fun testCancellableTaskAsDeferred() = runTest {
val cancellationTokenSource = CancellationTokenSource()
val deferred = Tasks.forResult(42).asDeferred(cancellationTokenSource)
assertEquals(42, deferred.await())
assertTrue(cancellationTokenSource.token.isCancellationRequested)
}
@Test
fun testNullResultCancellableTaskAsDeferred() = runTest {
val cancellationTokenSource = CancellationTokenSource()
assertNull(Tasks.forResult(null).asDeferred(cancellationTokenSource).await())
assertTrue(cancellationTokenSource.token.isCancellationRequested)
}
@Test
fun testCancelledCancellableTaskAsDeferred() = runTest {
val cancellationTokenSource = CancellationTokenSource()
val deferred = Tasks.forCanceled<Int>().asDeferred(cancellationTokenSource)
assertTrue(deferred.isCancelled)
try {
deferred.await()
fail("deferred.await() should be cancelled")
} catch (e: Exception) {
assertTrue(e is CancellationException)
}
assertTrue(cancellationTokenSource.token.isCancellationRequested)
}
@Test
fun testCancellingCancellableTaskAsDeferred() = runTest {
val cancellationTokenSource = CancellationTokenSource()
val task = TaskCompletionSource<Int>(cancellationTokenSource.token).task
val deferred = task.asDeferred(cancellationTokenSource)
deferred.cancel()
try {
deferred.await()
fail("deferred.await() should be cancelled")
} catch (e: Exception) {
assertTrue(e is CancellationException)
}
assertTrue(cancellationTokenSource.token.isCancellationRequested)
}
@Test
fun testExternallyCancelledCancellableTaskAsDeferred() = runTest {
val cancellationTokenSource = CancellationTokenSource()
val task = TaskCompletionSource<Int>(cancellationTokenSource.token).task
val deferred = task.asDeferred(cancellationTokenSource)
cancellationTokenSource.cancel()
try {
deferred.await()
fail("deferred.await() should be cancelled")
} catch (e: Exception) {
assertTrue(e is CancellationException)
}
assertTrue(cancellationTokenSource.token.isCancellationRequested)
}
@Test
fun testSeparatelyCancelledCancellableTaskAsDeferred() = runTest {
val cancellationTokenSource = CancellationTokenSource()
val task = TaskCompletionSource<Int>().task
task.asDeferred(cancellationTokenSource)
cancellationTokenSource.cancel()
assertTrue(cancellationTokenSource.token.isCancellationRequested)
}
@Test
fun testFailedCancellableTaskAsDeferred() = runTest {
val cancellationTokenSource = CancellationTokenSource()
val deferred = Tasks.forException<Int>(TestException("something went wrong")).asDeferred(cancellationTokenSource)
assertTrue(deferred.isCancelled && deferred.isCompleted)
val completionException = deferred.getCompletionExceptionOrNull()!!
assertTrue(completionException is TestException)
assertEquals("something went wrong", completionException.message)
try {
deferred.await()
fail("deferred.await() should throw an exception")
} catch (e: Exception) {
assertTrue(e is TestException)
assertEquals("something went wrong", e.message)
}
assertTrue(cancellationTokenSource.token.isCancellationRequested)
}
@Test
fun testFailingCancellableTaskAsDeferred() = runTest {
val cancellationTokenSource = CancellationTokenSource()
val lock = ReentrantLock().apply { lock() }
val deferred: Deferred<Int> = Tasks.call {
lock.withLock { throw TestException("something went wrong") }
}.asDeferred(cancellationTokenSource)
assertFalse(deferred.isCompleted)
lock.unlock()
try {
deferred.await()
fail("deferred.await() should throw an exception")
} catch (e: Exception) {
assertTrue(e is TestException)
assertEquals("something went wrong", e.message)
assertSame(e.cause, deferred.getCompletionExceptionOrNull()) // debug mode stack augmentation
}
assertTrue(cancellationTokenSource.token.isCancellationRequested)
}
@Test
fun testFastPathCompletedTaskWithCancelledTokenSourceAsDeferred() = runTest {
val cancellationTokenSource = CancellationTokenSource()
val deferred = Tasks.forResult(42).asDeferred(cancellationTokenSource)
cancellationTokenSource.cancel()
assertEquals(42, deferred.await())
}
@Test
fun testAwaitCancellableTask() = runTest {
val cancellationTokenSource = CancellationTokenSource()
val taskCompletionSource = TaskCompletionSource<Int>(cancellationTokenSource.token)
val deferred: Deferred<Int> = async(start = CoroutineStart.UNDISPATCHED) {
taskCompletionSource.task.await(cancellationTokenSource)
}
assertFalse(deferred.isCompleted)
taskCompletionSource.setResult(42)
assertEquals(42, deferred.await())
assertTrue(deferred.isCompleted)
}
@Test
fun testFailedAwaitTask() = runTest(expected = { it is TestException }) {
val cancellationTokenSource = CancellationTokenSource()
val taskCompletionSource = TaskCompletionSource<Int>(cancellationTokenSource.token)
val deferred: Deferred<Int> = async(start = CoroutineStart.UNDISPATCHED) {
taskCompletionSource.task.await(cancellationTokenSource)
}
assertFalse(deferred.isCompleted)
taskCompletionSource.setException(TestException("something went wrong"))
deferred.await()
}
@Test
fun testCancelledAwaitCancellableTask() = runTest {
val cancellationTokenSource = CancellationTokenSource()
val taskCompletionSource = TaskCompletionSource<Int>(cancellationTokenSource.token)
val deferred: Deferred<Int> = async(start = CoroutineStart.UNDISPATCHED) {
taskCompletionSource.task.await(cancellationTokenSource)
}
assertFalse(deferred.isCompleted)
// Cancel the deferred
deferred.cancel()
try {
deferred.await()
fail("deferred.await() should be cancelled")
} catch (e: Exception) {
assertTrue(e is CancellationException)
}
assertTrue(cancellationTokenSource.token.isCancellationRequested)
}
@Test
fun testExternallyCancelledAwaitCancellableTask() = runTest {
val cancellationTokenSource = CancellationTokenSource()
val taskCompletionSource = TaskCompletionSource<Int>(cancellationTokenSource.token)
val deferred: Deferred<Int> = async(start = CoroutineStart.UNDISPATCHED) {
taskCompletionSource.task.await(cancellationTokenSource)
}
assertFalse(deferred.isCompleted)
// Cancel the cancellation token source
cancellationTokenSource.cancel()
try {
deferred.await()
fail("deferred.await() should be cancelled")
} catch (e: Exception) {
assertTrue(e is CancellationException)
}
assertTrue(cancellationTokenSource.token.isCancellationRequested)
}
@Test
fun testFastPathCancellationTokenSourceCancelledAwaitCancellableTask() = runTest {
val cancellationTokenSource = CancellationTokenSource()
// Construct a task without the cancellation token source
val taskCompletionSource = TaskCompletionSource<Int>()
val deferred: Deferred<Int> = async(start = CoroutineStart.LAZY) {
taskCompletionSource.task.await(cancellationTokenSource)
}
assertFalse(deferred.isCompleted)
cancellationTokenSource.cancel()
// Cancelling the token doesn't cancel the deferred
assertTrue(cancellationTokenSource.token.isCancellationRequested)
assertFalse(deferred.isCompleted)
// Cleanup
deferred.cancel()
}
@Test
fun testSlowPathCancellationTokenSourceCancelledAwaitCancellableTask() = runTest {
val cancellationTokenSource = CancellationTokenSource()
// Construct a task without the cancellation token source
val taskCompletionSource = TaskCompletionSource<Int>()
val deferred: Deferred<Int> = async(start = CoroutineStart.UNDISPATCHED) {
taskCompletionSource.task.await(cancellationTokenSource)
}
assertFalse(deferred.isCompleted)
cancellationTokenSource.cancel()
// Cancelling the token doesn't cancel the deferred
assertTrue(cancellationTokenSource.token.isCancellationRequested)
assertFalse(deferred.isCompleted)
// Cleanup
deferred.cancel()
}
@Test
fun testFastPathWithCompletedTaskAndCanceledTokenSourceAwaitTask() = runTest {
val firstCancellationTokenSource = CancellationTokenSource()
val secondCancellationTokenSource = CancellationTokenSource()
// Construct a task with a different cancellation token source
val taskCompletionSource = TaskCompletionSource<Int>(firstCancellationTokenSource.token)
val deferred: Deferred<Int> = async(start = CoroutineStart.LAZY) {
taskCompletionSource.task.await(secondCancellationTokenSource)
}
assertFalse(deferred.isCompleted)
secondCancellationTokenSource.cancel()
assertFalse(deferred.isCompleted)
taskCompletionSource.setResult(42)
assertEquals(42, deferred.await())
assertTrue(deferred.isCompleted)
}
class TestException(message: String) : Exception(message)
}
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