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LimitedParallelismTest.kt
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LimitedParallelismTest.kt
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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
import org.junit.Test
import java.util.concurrent.*
import kotlin.coroutines.*
import kotlin.test.*
class LimitedParallelismTest : TestBase() {
@Test
fun testTaskFairness() = runTest {
val executor = newSingleThreadContext("test")
val view = executor.limitedParallelism(1)
val view2 = executor.limitedParallelism(1)
val j1 = launch(view) {
while (true) {
yield()
}
}
val j2 = launch(view2) { j1.cancel() }
joinAll(j1, j2)
executor.close()
}
@Test
fun testUnhandledException() = runTest {
var caughtException: Throwable? = null
val executor = Executors.newFixedThreadPool(
1
) {
Thread(it).also {
it.uncaughtExceptionHandler = Thread.UncaughtExceptionHandler { _, e -> caughtException = e }
}
}.asCoroutineDispatcher()
val view = executor.limitedParallelism(1)
view.dispatch(EmptyCoroutineContext, Runnable { throw TestException() })
withContext(view) {
// Verify it is in working state and establish happens-before
}
assertTrue { caughtException is TestException }
executor.close()
}
}