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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.*
class LimitedParallelismTest : TestBase() {
@Test
fun testParallelismSpec() {
assertFailsWith<IllegalArgumentException> { Dispatchers.Default.limitedParallelism(0) }
assertFailsWith<IllegalArgumentException> { Dispatchers.Default.limitedParallelism(-1) }
assertFailsWith<IllegalArgumentException> { Dispatchers.Default.limitedParallelism(Int.MIN_VALUE) }
Dispatchers.Default.limitedParallelism(Int.MAX_VALUE)
}
@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()
}
}