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/*
* Copyright 2016-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.coroutines.channels
import kotlinx.coroutines.*
import kotlin.test.*
open class ConflatedChannelTest : TestBase() {
protected open fun <T> createConflatedChannel() =
Channel<T>(Channel.CONFLATED)
@Test
fun testBasicConflationOfferTryReceive() {
val q = createConflatedChannel<Int>()
assertNull(q.tryReceive().getOrNull())
assertTrue(q.trySend(1).isSuccess)
assertTrue(q.trySend(2).isSuccess)
assertTrue(q.trySend(3).isSuccess)
assertEquals(3, q.tryReceive().getOrNull())
assertNull(q.tryReceive().getOrNull())
}
@Test
fun testConflatedSend() = runTest {
val q = createConflatedChannel<Int>()
q.send(1)
q.send(2) // shall conflated previously sent
assertEquals(2, q.receiveCatching().getOrNull())
}
@Test
fun testConflatedClose() = runTest {
val q = createConflatedChannel<Int>()
q.send(1)
q.close() // shall become closed but do not conflate last sent item yet
assertTrue(q.isClosedForSend)
assertFalse(q.isClosedForReceive)
assertEquals(1, q.receive())
// not it is closed for receive, too
assertTrue(q.isClosedForSend)
assertTrue(q.isClosedForReceive)
assertNull(q.receiveCatching().getOrNull())
}
@Test
fun testConflationSendReceive() = runTest {
val q = createConflatedChannel<Int>()
expect(1)
launch { // receiver coroutine
expect(4)
assertEquals(2, q.receive())
expect(5)
assertEquals(3, q.receive()) // this receive suspends
expect(8)
assertEquals(6, q.receive()) // last conflated value
expect(9)
}
expect(2)
q.send(1)
q.send(2) // shall conflate
expect(3)
yield() // to receiver
expect(6)
q.send(3) // send to the waiting receiver
q.send(4) // buffer
q.send(5) // conflate
q.send(6) // conflate again
expect(7)
yield() // to receiver
finish(10)
}
@Test
fun testConsumeAll() = runTest {
val q = createConflatedChannel<Int>()
expect(1)
for (i in 1..10) {
q.send(i) // stores as last
}
q.cancel()
check(q.isClosedForSend)
check(q.isClosedForReceive)
assertFailsWith<CancellationException> { q.receiveCatching().getOrThrow() }
finish(2)
}
@Test
fun testCancelWithCause() = runTest({ it is TestCancellationException }) {
val channel = createConflatedChannel<Int>()
channel.cancel(TestCancellationException())
channel.receive()
}
}
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