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/*
* Copyright 2016-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
@file:Suppress("NAMED_ARGUMENTS_NOT_ALLOWED") // KT-21913
package kotlinx.coroutines
import kotlin.test.*
class AsyncLazyTest : TestBase() {
@Test
fun testSimple() = runTest {
expect(1)
val d = async(start = CoroutineStart.LAZY) {
expect(3)
42
}
expect(2)
assertTrue(!d.isActive && !d.isCompleted)
assertEquals(d.await(), 42)
assertTrue(!d.isActive && d.isCompleted && !d.isCancelled)
expect(4)
assertEquals(d.await(), 42) // second await -- same result
finish(5)
}
@Test
fun testLazyDeferAndYield() = runTest {
expect(1)
val d = async(start = CoroutineStart.LAZY) {
expect(3)
yield() // this has not effect, because parent coroutine is waiting
expect(4)
42
}
expect(2)
assertTrue(!d.isActive && !d.isCompleted)
assertEquals(d.await(), 42)
assertTrue(!d.isActive && d.isCompleted && !d.isCancelled)
expect(5)
assertEquals(d.await(), 42) // second await -- same result
finish(6)
}
@Test
fun testLazyDeferAndYield2() = runTest {
expect(1)
val d = async(start = CoroutineStart.LAZY) {
expect(7)
42
}
expect(2)
assertTrue(!d.isActive && !d.isCompleted)
launch { // see how it looks from another coroutine
expect(4)
assertTrue(!d.isActive && !d.isCompleted)
yield() // yield back to main
expect(6)
assertTrue(d.isActive && !d.isCompleted) // implicitly started by main's await
yield() // yield to d
}
expect(3)
assertTrue(!d.isActive && !d.isCompleted)
yield() // yield to second child (lazy async is not computing yet)
expect(5)
assertTrue(!d.isActive && !d.isCompleted)
assertEquals(d.await(), 42) // starts computing
assertTrue(!d.isActive && d.isCompleted && !d.isCancelled)
finish(8)
}
@Test
fun testSimpleException() = runTest(
expected = { it is TestException }
) {
expect(1)
val d = async(start = CoroutineStart.LAZY) {
finish(3)
throw TestException()
}
expect(2)
assertTrue(!d.isActive && !d.isCompleted)
d.await() // will throw IOException
}
@Test
fun testLazyDeferAndYieldException() = runTest(
expected = { it is TestException }
) {
expect(1)
val d = async(start = CoroutineStart.LAZY) {
expect(3)
yield() // this has not effect, because parent coroutine is waiting
finish(4)
throw TestException()
}
expect(2)
assertTrue(!d.isActive && !d.isCompleted)
d.await() // will throw IOException
}
@Test
fun testCatchException() = runTest {
expect(1)
val d = async(NonCancellable, start = CoroutineStart.LAZY) {
expect(3)
throw TestException()
}
expect(2)
assertTrue(!d.isActive && !d.isCompleted)
try {
d.await() // will throw IOException
} catch (e: TestException) {
assertTrue(!d.isActive && d.isCompleted && d.isCancelled)
expect(4)
}
finish(5)
}
@Test
fun testStart() = runTest {
expect(1)
val d = async(start = CoroutineStart.LAZY) {
expect(4)
42
}
expect(2)
assertTrue(!d.isActive && !d.isCompleted)
assertTrue(d.start())
assertTrue(d.isActive && !d.isCompleted)
expect(3)
assertTrue(!d.start())
yield() // yield to started coroutine
assertTrue(!d.isActive && d.isCompleted && !d.isCancelled) // and it finishes
expect(5)
assertEquals(d.await(), 42) // await sees result
finish(6)
}
@Test
fun testCancelBeforeStart() = runTest(
expected = { it is CancellationException }
) {
expect(1)
val d = async(start = CoroutineStart.LAZY) {
expectUnreached()
42
}
expect(2)
assertTrue(!d.isActive && !d.isCompleted)
d.cancel()
assertTrue(!d.isActive && d.isCompleted && d.isCancelled)
assertTrue(!d.start())
finish(3)
assertEquals(d.await(), 42) // await shall throw CancellationException
expectUnreached()
}
@Test
fun testCancelWhileComputing() = runTest(
expected = { it is CancellationException }
) {
expect(1)
val d = async(start = CoroutineStart.LAZY) {
expect(4)
yield() // yield to main, that is going to cancel us
expectUnreached()
42
}
expect(2)
assertTrue(!d.isActive && !d.isCompleted && !d.isCancelled)
assertTrue(d.start())
assertTrue(d.isActive && !d.isCompleted && !d.isCancelled)
expect(3)
yield() // yield to d
expect(5)
assertTrue(d.isActive && !d.isCompleted && !d.isCancelled)
d.cancel()
assertTrue(!d.isActive && d.isCancelled) // cancelling !
assertTrue(!d.isActive && d.isCancelled) // still cancelling
finish(6)
assertEquals(d.await(), 42) // await shall throw CancellationException
expectUnreached()
}
}
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