How to use KClass.isIsolate method of io.kotest.engine.concurrency.concurrency class

Best Kotest code snippet using io.kotest.engine.concurrency.concurrency.KClass.isIsolate

ConcurrentTestSuiteScheduler.kt

Source: ConcurrentTestSuiteScheduler.kt Github

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1package io.kotest.engine2import io.kotest.common.ExperimentalKotest3import io.kotest.core.annotation.DoNotParallelize4import io.kotest.core.annotation.Isolate5import io.kotest.core.project.TestSuite6import io.kotest.core.spec.SpecRef7import io.kotest.engine.concurrency.defaultCoroutineDispatcherFactory8import io.kotest.engine.concurrency.isIsolate9import io.kotest.engine.interceptors.EngineContext10import io.kotest.engine.listener.CollectingTestEngineListener11import io.kotest.engine.spec.SpecExecutor12import io.kotest.mpp.Logger13import io.kotest.mpp.bestName14import kotlinx.coroutines.coroutineScope15import kotlinx.coroutines.launch16import kotlinx.coroutines.sync.Semaphore17import kotlinx.coroutines.sync.withPermit18/​**19 * A [TestSuiteScheduler] that schedules specs concurrently, up to a provided [maxConcurrent] value.20 * If the value is 1 then this scheduler will execute specs strictly sequentially.21 *22 * Additionally, on JVM targets, it will recognize the [Isolate] and [DoNotParallelize]23 * annotations to ensure those specs are never scheduled concurrently.24 *25 * @param maxConcurrent The maximum number of concurrent coroutines.26 */​27@ExperimentalKotest28internal class ConcurrentTestSuiteScheduler(29 private val maxConcurrent: Int,30 private val context: EngineContext,31) : TestSuiteScheduler {32 private val logger = Logger(ConcurrentTestSuiteScheduler::class)33 override suspend fun schedule(suite: TestSuite): EngineResult {34 logger.log { Pair(null, "Launching ${suite.specs.size} specs") }35 val (sequential, concurrent) = suite.specs.partition { it.kclass.isIsolate() }36 logger.log { Pair(null, "Split on isIsolate: ${sequential.size} sequential ${concurrent.size} concurrent") }37 schedule(concurrent, maxConcurrent)38 logger.log { Pair(null, "Concurrent specs have completed") }39 schedule(sequential, 1)40 logger.log { Pair(null, "Sequential specs have completed") }41 return EngineResult(emptyList())42 }43 private suspend fun schedule(44 specs: List<SpecRef>,45 concurrency: Int,46 ) = coroutineScope { /​/​ we don't want this function to return until all specs are completed47 val coroutineDispatcherFactory = defaultCoroutineDispatcherFactory(context.configuration)48 val semaphore = Semaphore(concurrency)49 val collector = CollectingTestEngineListener()50 specs.forEach { ref ->51 logger.log { Pair(ref.kclass.bestName(), "Scheduling coroutine") }52 launch {53 semaphore.withPermit {54 logger.log { Pair(ref.kclass.bestName(), "Acquired permit") }55 if (context.configuration.projectWideFailFast && collector.errors) {56 context.listener.specIgnored(ref.kclass, null)57 } else {58 try {59 val executor = SpecExecutor(coroutineDispatcherFactory, context.mergeListener(collector))60 logger.log { Pair(ref.kclass.bestName(), "Executing ref") }61 executor.execute(ref)62 } catch (t: Throwable) {63 logger.log { Pair(ref.kclass.bestName(), "Unhandled error during spec execution $t") }64 throw t65 }66 }67 }68 logger.log { Pair(ref.kclass.bestName(), "Released permit") }69 }70 }71 }72}...

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concurrency.kt

Source: concurrency.kt Github

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1package io.kotest.engine.concurrency2import io.kotest.core.annotation.DoNotParallelize3import io.kotest.core.annotation.Isolate4import io.kotest.mpp.annotation5import kotlin.reflect.KClass6/​**7 * Returns true if this class is annotated with either of the annotations used to indicate8 * this spec should not run concurrently regardless of config.9 *10 * Those annotations are [DoNotParallelize] and [Isolate].11 */​12internal fun KClass<*>.isIsolate(): Boolean = annotation<DoNotParallelize>() != null || annotation<Isolate>() != null...

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KClass.isIsolate

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1 val concurrency = concurrency()2 val testThread = Thread.currentThread()3 return when (concurrency) {4 is Concurrency.Isolated -> {5 }6 is Concurrency.Shared -> {7 val newContext = context.withValue(testThread, value)8 }9 }10 }11class ContextTest : FunSpec() {12 init {13 test("context should be set") {14 val context = context()15 context.get("hello") shouldBe "world"16 }17 }18}

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