[question] Is this "IllegalStateException: This job has not completed yet" while using runBlockingTest normal?

[sum-elier]

Why when executing the following test:

@Test
fun foo() = runBlockingTest {
  bar()
}

suspend fun bar() {
  println(1)
  withContext(Dispatchers.IO) {
	 println(2)
  }
  println(3)
}

The output is:

1
2
3

java.lang.IllegalStateException: This job has not completed yet

	at kotlinx.coroutines.JobSupport.getCompletionExceptionOrNull(JobSupport.kt:1114)
	at kotlinx.coroutines.test.TestBuildersKt.runBlockingTest(TestBuilders.kt:53)
	at kotlinx.coroutines.test.TestBuildersKt.runBlockingTest$default(TestBuilders.kt:45)
	at com.foopkg.MyTests.foo(MyTests.kt:11)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:628)
	at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:117)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$7(TestMethodTestDescriptor.java:184)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:180)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:127)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:68)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:135)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
	at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
	at java.util.ArrayList.forEach(ArrayList.java:1251)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
	at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
	at java.util.ArrayList.forEach(ArrayList.java:1251)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
	at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:229)
	at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:197)
	at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:211)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:191)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128)
	at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:74)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

Is it related to #1204 ?

[voghDev]

I'm having the same problem. I'll paste the Test I'm running here, for if it helps

Test (NewsPresenterTest.kt)

@Test
fun `should load first page of news on start`() = runBlockingTest {
    givenThereAreNoNews()

    presenter.initialize()

    verify(mockNewsRepository).getNews(eq(1), anyLong())
}

Production code (NewsPresenter.kt)

override suspend fun initialize() {
    val result = coroutine { newsRepository.getNews(page) }

    // do more stuff with the result...
}

suspend fun <T> coroutine(
    context: CoroutineContext = Dispatchers.IO,
    block: suspend CoroutineScope.() -> T
): T = withContext(context, block)

Expected: Green, run successfully
Output: java.lang.IllegalStateException: This job has not completed yet

[Update] I've noticed that replacing Dispatchers.IO with Dispatchers.Main makes the Test go green. It only fails when using Dispatchers.IO Context

I'm sorry I can't post it to a public GitHub repository :-( I can post any additional code that might be necessary for diagnosing this

[elizarov]

cc @objcode

[objcode]

Thanks for the minimal repro!

In the current version there's an issue that causes runBlockingTest to throw this exception incorrectly when there are multiple threads. This is the same issue reported in #1204

Patch #1206 will change this to pass as expected.

[mkobit]

Been running this with ktor-client tests as well - is the best workaround for now to just use runBlocking (if you don't entirely need all the APIs and support from runBlockingTest)?

[LypchenkoS]

I replaced runBlockingTest on runBlocking and it helped.

[fireb86]

I replaced runBlockingTest on runBlocking and it helped.

runBlocking works for me too

private val testDispatcher = TestCoroutineDispatcher()

@Before
fun setup() {
	Dispatchers.setMain(testDispatcher)
}

@After
fun cleanUp() {
	Dispatchers.resetMain()
	testDispatcher.cleanupTestCoroutines()
}

@Test
fun testCoroutines1() = runBlocking {
	withContext(Dispatchers.Main) {
		Assert.assertEquals(job1().await() and job2().await(), false)
	}
}

@Test
fun testCoroutines2() = runBlocking {
	withContext(Dispatchers.Main) {
		Assert.assertEquals(job1().await() or job2().await(), true)
	}
}

suspend fun job1() = GlobalScope.async(Dispatchers.Default) {
	delay(1000)
	true
}

suspend fun job2() = GlobalScope.async(Dispatchers.Default) {
	delay(500)
	false
}

[glasser]

The one annoying thing about runBlocking is that JUnit tests don't run unless they return Unit, but it's hard to remember to always type runBlocking<Unit> or fun testFoo(): Unit = runBlocking`.

We use this just to get around that:

fun testBlocking(test: suspend CoroutineScope.() -> Unit) = runBlocking { test() }

[leandrofnjr]

Hi,

i'm facing same issue as described above executing my room database unit tests.

Has there been found out any fix for that ?

[nuhkoca]

Still continuing. I am using a custom CoroutinesTestRule but still getting this issue. Any workaround except using runBlocking?