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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.selects
import kotlinx.coroutines.*
import kotlin.test.*
class SelectDeferredTest : TestBase() {
@Test
fun testSimpleReturnsImmediately() = runTest {
expect(1)
val d1 = async {
expect(3)
42
}
expect(2)
val res = select<String> {
d1.onAwait { v ->
expect(4)
assertEquals(42, v)
"OK"
}
}
expect(5)
assertEquals("OK", res)
finish(6)
}
@Test
fun testSimpleWithYield() = runTest {
expect(1)
val d1 = async {
expect(3)
42
}
launch {
expect(4)
yield() // back to main
expect(6)
}
expect(2)
val res = select<String> {
d1.onAwait { v ->
expect(5)
assertEquals(42, v)
yield() // to launch
expect(7)
"OK"
}
}
finish(8)
assertEquals("OK", res)
}
@Test
fun testSelectIncompleteLazy() = runTest {
expect(1)
val d1 = async(start = CoroutineStart.LAZY) {
expect(5)
42
}
launch {
expect(3)
val res = select<String> {
d1.onAwait { v ->
expect(7)
assertEquals(42, v)
"OK"
}
}
expect(8)
assertEquals("OK", res)
}
expect(2)
yield() // to launch
expect(4)
yield() // to started async
expect(6)
yield() // to triggered select
finish(9)
}
@Test
fun testSelectTwo() = runTest {
expect(1)
val d1 = async {
expect(3)
yield() // to the other deffered
expect(5)
yield() // to fired select
expect(7)
"d1"
}
val d2 = async {
expect(4)
"d2" // returns result
}
expect(2)
val res = select<String> {
d1.onAwait {
expectUnreached()
"FAIL"
}
d2.onAwait { v2 ->
expect(6)
assertEquals("d2", v2)
yield() // to first deferred
expect(8)
"OK"
}
}
assertEquals("OK", res)
finish(9)
}
@Test
fun testSelectCancel() = runTest(
expected = { it is CancellationException }
) {
expect(1)
val d = CompletableDeferred<String>()
launch {
finish(3)
d.cancel() // will cancel after select starts
}
expect(2)
select<Unit> {
d.onAwait {
expectUnreached() // will not select
}
}
expectUnreached()
}
@Test
fun testSelectIncomplete() = runTest {
val deferred = async { Wrapper("OK") }
val result = select<Wrapper> {
assertFalse(deferred.isCompleted)
assertTrue(deferred.isActive)
deferred.onAwait {
it
}
}
assertEquals("OK", result.value)
}
@Test
fun testSelectIncompleteFastPath() = runTest {
val deferred = async(Dispatchers.Unconfined) { Wrapper("OK") }
val result = select<Wrapper> {
assertTrue(deferred.isCompleted)
assertFalse(deferred.isActive)
deferred.onAwait {
it
}
}
assertEquals("OK", result.value)
}
private class Wrapper(val value: String) : Incomplete {
override val isActive: Boolean
get() = error("")
override val list: NodeList?
get() = error("")
}
}
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