kotlinx-coroutines-debug/test/DebugProbesTest.kt

package kotlinx.coroutines.debug

import kotlinx.coroutines.testing.*
import kotlinx.coroutines.*
import org.junit.Test
import java.util.concurrent.*
import java.util.concurrent.atomic.AtomicBoolean
import kotlin.test.*

class DebugProbesTest : DebugTestBase() {

    private fun CoroutineScope.createDeferred(): Deferred<*> = async(NonCancellable) {
        throw ExecutionException(null)
    }

    @Test
    fun testAsync() = runTest {
        val deferred = createDeferred()
        val traces = listOf(
            "java.util.concurrent.ExecutionException\n" +
                "\tat kotlinx.coroutines.debug.DebugProbesTest\$createDeferred\$1.invokeSuspend(DebugProbesTest.kt:14)\n" +
                "\tat _COROUTINE._BOUNDARY._(CoroutineDebugging.kt)\n" +
                "\tat kotlinx.coroutines.debug.DebugProbesTest.oneMoreNestedMethod(DebugProbesTest.kt:49)\n" +
                "\tat kotlinx.coroutines.debug.DebugProbesTest.nestedMethod(DebugProbesTest.kt:44)\n" +
                "\tat kotlinx.coroutines.debug.DebugProbesTest\$testAsync\$1.invokeSuspend(DebugProbesTest.kt:17)\n",
            "Caused by: java.util.concurrent.ExecutionException\n" +
                "\tat kotlinx.coroutines.debug.DebugProbesTest\$createDeferred\$1.invokeSuspend(DebugProbesTest.kt:14)\n" +
                "\tat kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:32)"
        )
        nestedMethod(deferred, traces)
        deferred.join()
    }

    @Test
    fun testAsyncWithProbes() = DebugProbes.withDebugProbes {
        DebugProbes.sanitizeStackTraces = false
        runTest {
            val deferred = createDeferred()
            val traces = listOf(
                "java.util.concurrent.ExecutionException\n" +
                    "\tat kotlinx.coroutines.debug.DebugProbesTest\$createDeferred\$1.invokeSuspend(DebugProbesTest.kt)\n" +
                    "\tat _COROUTINE._BOUNDARY._(CoroutineDebugging.kt)\n" +
                    "\tat kotlinx.coroutines.debug.DebugProbesTest.oneMoreNestedMethod(DebugProbesTest.kt)\n" +
                    "\tat kotlinx.coroutines.debug.DebugProbesTest.nestedMethod(DebugProbesTest.kt)\n" +
                    "\tat kotlinx.coroutines.debug.DebugProbesTest\$testAsyncWithProbes\$1\$1.invokeSuspend(DebugProbesTest.kt:62)",
                "Caused by: java.util.concurrent.ExecutionException\n" +
                    "\tat kotlinx.coroutines.debug.DebugProbesTest\$createDeferred\$1.invokeSuspend(DebugProbesTest.kt)\n" +
                    "\tat kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt)\n"
            )
            nestedMethod(deferred, traces)
            deferred.join()
        }
    }

    @Test
    fun testAsyncWithSanitizedProbes() = DebugProbes.withDebugProbes {
        DebugProbes.sanitizeStackTraces = true
        runTest {
            val deferred = createDeferred()
            val traces = listOf(
                "java.util.concurrent.ExecutionException\n" +
                    "\tat kotlinx.coroutines.debug.DebugProbesTest\$createDeferred\$1.invokeSuspend(DebugProbesTest.kt:16)\n" +
                    "\tat _COROUTINE._BOUNDARY._(CoroutineDebugging.kt)\n" +
                    "\tat kotlinx.coroutines.debug.DebugProbesTest.oneMoreNestedMethod(DebugProbesTest.kt:71)\n" +
                    "\tat kotlinx.coroutines.debug.DebugProbesTest.nestedMethod(DebugProbesTest.kt:66)\n" +
                    "\tat kotlinx.coroutines.debug.DebugProbesTest\$testAsyncWithSanitizedProbes\$1\$1.invokeSuspend(DebugProbesTest.kt:87)",
                "Caused by: java.util.concurrent.ExecutionException\n" +
                    "\tat kotlinx.coroutines.debug.DebugProbesTest\$createDeferred\$1.invokeSuspend(DebugProbesTest.kt:16)\n" +
                    "\tat kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:32)\n"
            )
            nestedMethod(deferred, traces)
            deferred.join()
        }
    }

    private suspend fun nestedMethod(deferred: Deferred<*>, traces: List<String>) {
        oneMoreNestedMethod(deferred, traces)
        assertTrue(true) // Prevent tail-call optimization
    }

    private suspend fun oneMoreNestedMethod(deferred: Deferred<*>, traces: List<String>) {
        try {
            deferred.await()
            expectUnreached()
        } catch (e: ExecutionException) {
            verifyStackTrace(e, traces)
        }
    }

    @Test
    fun testMultipleConsecutiveProbeResumed() = runTest {
        val job = launch {
            expect(1)
            foo()
            expect(4)
            delay(Long.MAX_VALUE)
            expectUnreached()
        }
        yield()
        yield()
        expect(5)
        val infos = DebugProbes.dumpCoroutinesInfo()
        assertEquals(2, infos.size)
        assertEquals(setOf(State.RUNNING, State.SUSPENDED), infos.map { it.state }.toSet())
        job.cancel()
        finish(6)
    }

    @Test
    fun testMultipleConsecutiveProbeResumedAndLaterRunning() = runTest {
        val reachedActiveStage = AtomicBoolean(false)
        val job = launch(Dispatchers.Default) {
            expect(1)
            foo()
            expect(4)
            yield()
            reachedActiveStage.set(true)
            while (isActive) {
                // Spin until test is done
            }
        }
        while (!reachedActiveStage.get()) {
            delay(10)
        }
        expect(5)
        val infos = DebugProbes.dumpCoroutinesInfo()
        assertEquals(2, infos.size)
        assertEquals(setOf(State.RUNNING, State.RUNNING), infos.map { it.state }.toSet())
        job.cancel()
        finish(6)
    }

    private suspend fun foo() {
        bar()
        // Kill TCO
        expect(3)
    }


    private suspend fun bar() {
        yield()
        expect(2)
    }
}