Introduced in 2.6.0 Running BasePlatformTestCase alongside Junit Platform fails

aiden.fry · November 13, 2025, 5:33pm

Tool	Version
Gradle	8.7+
IntelliJ Platform Gradle Plugin	2.6.0+

In 2.5.0 this worked fine.

Tests with junit 5

Tests extending from BasePlatformTestCase (Junit 3)

dependencies {

testImplementation(group = "junit", name = "junit", version = "${project.findProperty("junit4_version")}")
testImplementation(group = "org.junit.vintage", name = "junit-vintage-engine", version = junit_version)
  testImplementation(group = "org.junit.jupiter", name = "junit-jupiter-api", version = junit_version)
  testImplementation(group = "org.junit.jupiter", name = "junit-jupiter-engine", version = junit_version)
  testImplementation(group = "org.junit.jupiter", name = "junit-jupiter-params", version = junit_version)
...
  
intellijPlatform {

   testFramework(TestFrameworkType.Bundled)
...

test {

  useJUnit {
    useJUnitPlatform()
  }

With Errors like this:

ERROR: Missing extension point: com.intellij.undoProvider in container {}
java.lang.IllegalArgumentException: Missing extension point: com.intellij.undoProvider in container {}
at com.intellij.openapi.extensions.impl.ExtensionsAreaImpl.getExtensionPoint(ExtensionsAreaImpl.kt:273)
at com.intellij.openapi.extensions.BaseExtensionPointName.getPointImpl$intellij_platform_extensions(BaseExtensionPointName.kt:18)
at com.intellij.openapi.extensions.ExtensionPointName.getExtensionList(ExtensionPointName.kt:54)
at com.intellij.openapi.command.impl.UndoManagerImpl.getUndoProviders(UndoManagerImpl.java:252)
at com.intellij.openapi.command.impl.UndoManagerImpl.onCommandStarted(UndoManagerImpl.java:258)
at com.intellij.openapi.command.impl.UndoManagerImpl$MyCommandListener.commandStarted(UndoManagerImpl.java:1005)
at com.intellij.util.messages.impl.MessageBusImplKt.invokeMethod(MessageBusImpl.kt:768)
at com.intellij.util.messages.impl.MessageBusImplKt.invokeListener(MessageBusImpl.kt:712)
at com.intellij.util.messages.impl.MessageBusImplKt.executeOrAddToQueue(MessageBusImpl.kt:533)
at com.intellij.util.messages.impl.ToDirectChildrenMessagePublisher.publish$intellij_platform_core(CompositeMessageBus.kt:281)
at com.intellij.util.messages.impl.MessagePublisher.invoke(MessageBusImpl.kt:481)
at jdk.proxy3/jdk.proxy3.$Proxy157.commandStarted(Unknown Source)
at com.intellij.openapi.command.impl.CoreCommandProcessor.fireCommandStarted(CoreCommandProcessor.java:473)
at com.intellij.openapi.command.impl.CoreCommandProcessor.lambda$executeCommand$2(CoreCommandProcessor.java:227)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction$lambda$6(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:222)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteIntentReadAction(ApplicationImpl.java:1009)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:224)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:179)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:169)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:155)
at com.intellij.openapi.command.impl.UndoManagerImpl.flushMergers(UndoManagerImpl.java:938)
at com.intellij.openapi.command.impl.UndoManagerImpl.dropHistoryInTests(UndoManagerImpl.java:920)
at com.intellij.testFramework.HeavyPlatformTestCase.lambda$cleanupApplicationCaches$5(HeavyPlatformTestCase.java:359)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction$lambda$6(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:222)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteIntentReadAction(ApplicationImpl.java:1009)
at com.intellij.testFramework.HeavyPlatformTestCase.cleanupApplicationCaches(HeavyPlatformTestCase.java:359)
at com.intellij.testFramework.fixtures.impl.LightIdeaTestFixtureImpl.lambda$tearDown$12(LightIdeaTestFixtureImpl.java:110)
at com.intellij.testFramework.RunAll$Companion$actionSequence$1$1.invoke(RunAll.kt:72)
at com.intellij.testFramework.RunAll$Companion$actionSequence$1$1.invoke(RunAll.kt:72)
at com.intellij.testFramework.common.RunAllKt.runAllCatching(runAll.kt:56)
at com.intellij.testFramework.common.RunAllKt.runAll(runAll.kt:32)
at com.intellij.testFramework.RunAll.run(RunAll.kt:21)
at com.intellij.testFramework.fixtures.impl.LightIdeaTestFixtureImpl.tearDown(LightIdeaTestFixtureImpl.java:111)
at com.intellij.testFramework.fixtures.impl.CodeInsightTestFixtureImpl.lambda$tearDown$45(CodeInsightTestFixtureImpl.java:1451)
at com.intellij.testFramework.EdtTestUtil.lambda$runInEdtAndWait$1(EdtTestUtil.java:52)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction$lambda$6(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:222)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteIntentReadAction(ApplicationImpl.java:1009)
at com.intellij.testFramework.EdtTestUtil.runInEdtAndWait(EdtTestUtil.java:51)
at com.intellij.testFramework.EdtTestUtil.runInEdtAndWait(EdtTestUtil.java:41)
at com.intellij.testFramework.fixtures.impl.CodeInsightTestFixtureImpl.lambda$tearDown$46(CodeInsightTestFixtureImpl.java:1451)
at com.intellij.testFramework.RunAll$Companion$actionSequence$1$1.invoke(RunAll.kt:72)
at com.intellij.testFramework.RunAll$Companion$actionSequence$1$1.invoke(RunAll.kt:72)
at com.intellij.testFramework.common.RunAllKt.runAllCatching(runAll.kt:56)
at com.intellij.testFramework.common.RunAllKt.runAll(runAll.kt:32)
at com.intellij.testFramework.RunAll$Companion.runAll(RunAll.kt:45)
at com.intellij.testFramework.RunAll.runAll(RunAll.kt)
at com.intellij.testFramework.fixtures.impl.CodeInsightTestFixtureImpl.tearDown(CodeInsightTestFixtureImpl.java:1407)
at com.intellij.testFramework.fixtures.BasePlatformTestCase.tearDown(BasePlatformTestCase.java:66)
at com.intellij.testFramework.UsefulTestCase.invokeTearDown(UsefulTestCase.java:455)
at com.intellij.testFramework.UsefulTestCase.defaultRunBare(UsefulTestCase.java:439)
at com.intellij.testFramework.UsefulTestCase.lambda$runBare$13(UsefulTestCase.java:515)
at com.intellij.testFramework.EdtTestUtil.lambda$runInEdtAndWait$5(EdtTestUtil.java:92)
at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:240)
at com.intellij.openapi.application.TransactionGuardImpl.access$100(TransactionGuardImpl.java:25)
at com.intellij.openapi.application.TransactionGuardImpl$1.run(TransactionGuardImpl.java:202)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runIntendedWriteActionOnCurrentThread$lambda$7(AnyThreadWriteThreadingSupport.kt:319)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction$lambda$6(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:222)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runIntendedWriteActionOnCurrentThread(AnyThreadWriteThreadingSupport.kt:318)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:928)
at com.intellij.openapi.application.impl.ApplicationImpl$4.run(ApplicationImpl.java:501)
at com.intellij.openapi.application.impl.AppImplKt.rethrowExceptions$lambda$2(appImpl.kt:66)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:102)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:102)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:108)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:102)
at com.intellij.util.concurrency.ContextRunnable.run(ContextRunnable.java:27)
at com.intellij.openapi.application.impl.AppImplKt.rethrowExceptions$lambda$3(appImpl.kt:77)
at com.intellij.openapi.application.impl.LaterInvocator$1.run(LaterInvocator.java:105)
at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:117)
at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:43)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:781)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:728)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:722)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:750)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.kt:585)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.kt:482)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$12$lambda$11$lambda$10$lambda$9(IdeEventQueue.kt:307)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:864)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$12$lambda$11$lambda$10(IdeEventQueue.kt:306)
at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$3(IdeEventQueue.kt:958)
at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:117)
at com.intellij.ide.IdeEventQueueKt.performActivity(IdeEventQueue.kt:958)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$12(IdeEventQueue.kt:301)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.kt:341)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:207)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:92)
ERROR: Missing extension point: com.intellij.undoProvider in container {}
java.lang.IllegalArgumentException: Missing extension point: com.intellij.undoProvider in container {}
at com.intellij.openapi.extensions.impl.ExtensionsAreaImpl.getExtensionPoint(ExtensionsAreaImpl.kt:273)
at com.intellij.openapi.extensions.BaseExtensionPointName.getPointImpl$intellij_platform_extensions(BaseExtensionPointName.kt:18)
at com.intellij.openapi.extensions.ExtensionPointName.getExtensionList(ExtensionPointName.kt:54)
at com.intellij.openapi.command.impl.UndoManagerImpl.getUndoProviders(UndoManagerImpl.java:252)
at com.intellij.openapi.command.impl.UndoManagerImpl.onCommandFinished(UndoManagerImpl.java:279)
at com.intellij.openapi.command.impl.UndoManagerImpl$MyCommandListener.commandFinished(UndoManagerImpl.java:1014)
at com.intellij.util.messages.impl.MessageBusImplKt.invokeMethod(MessageBusImpl.kt:768)
at com.intellij.util.messages.impl.MessageBusImplKt.invokeListener(MessageBusImpl.kt:712)
at com.intellij.util.messages.impl.MessageBusImplKt.executeOrAddToQueue(MessageBusImpl.kt:533)
at com.intellij.util.messages.impl.ToDirectChildrenMessagePublisher.publish$intellij_platform_core(CompositeMessageBus.kt:281)
at com.intellij.util.messages.impl.MessagePublisher.invoke(MessageBusImpl.kt:481)
at jdk.proxy3/jdk.proxy3.$Proxy157.commandFinished(Unknown Source)
at com.intellij.openapi.command.impl.CoreCommandProcessor.fireCommandFinished(CoreCommandProcessor.java:294)
at com.intellij.openapi.command.impl.CoreCommandProcessor.finishCommand(CoreCommandProcessor.java:276)
at com.intellij.openapi.command.impl.CommandProcessorImpl.finishCommand(CommandProcessorImpl.java:37)
at com.intellij.openapi.command.impl.CoreCommandProcessor.lambda$executeCommand$1(CoreCommandProcessor.java:236)
at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeNonCancelableSection$3(CoreProgressManager.java:289)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:755)
at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:711)
at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$computeInNonCancelableSection$4(CoreProgressManager.java:297)
at com.intellij.openapi.progress.Cancellation.computeInNonCancelableSection(Cancellation.java:139)
at com.intellij.openapi.progress.impl.CoreProgressManager.computeInNonCancelableSection(CoreProgressManager.java:297)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeNonCancelableSection(CoreProgressManager.java:288)
at com.intellij.openapi.command.impl.CoreCommandProcessor.lambda$executeCommand$2(CoreCommandProcessor.java:235)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction$lambda$6(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:222)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteIntentReadAction(ApplicationImpl.java:1009)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:224)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:179)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:169)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:155)
at com.intellij.openapi.command.impl.UndoManagerImpl.flushMergers(UndoManagerImpl.java:938)
at com.intellij.openapi.command.impl.UndoManagerImpl.dropHistoryInTests(UndoManagerImpl.java:920)
at com.intellij.testFramework.HeavyPlatformTestCase.lambda$cleanupApplicationCaches$5(HeavyPlatformTestCase.java:359)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction$lambda$6(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:222)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteIntentReadAction(ApplicationImpl.java:1009)
at com.intellij.testFramework.HeavyPlatformTestCase.cleanupApplicationCaches(HeavyPlatformTestCase.java:359)
at com.intellij.testFramework.fixtures.impl.LightIdeaTestFixtureImpl.lambda$tearDown$12(LightIdeaTestFixtureImpl.java:110)
at com.intellij.testFramework.RunAll$Companion$actionSequence$1$1.invoke(RunAll.kt:72)
at com.intellij.testFramework.RunAll$Companion$actionSequence$1$1.invoke(RunAll.kt:72)
at com.intellij.testFramework.common.RunAllKt.runAllCatching(runAll.kt:56)
at com.intellij.testFramework.common.RunAllKt.runAll(runAll.kt:32)
at com.intellij.testFramework.RunAll.run(RunAll.kt:21)
at com.intellij.testFramework.fixtures.impl.LightIdeaTestFixtureImpl.tearDown(LightIdeaTestFixtureImpl.java:111)
at com.intellij.testFramework.fixtures.impl.CodeInsightTestFixtureImpl.lambda$tearDown$45(CodeInsightTestFixtureImpl.java:1451)
at com.intellij.testFramework.EdtTestUtil.lambda$runInEdtAndWait$1(EdtTestUtil.java:52)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction$lambda$6(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:222)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteIntentReadAction(ApplicationImpl.java:1009)
at com.intellij.testFramework.EdtTestUtil.runInEdtAndWait(EdtTestUtil.java:51)
at com.intellij.testFramework.EdtTestUtil.runInEdtAndWait(EdtTestUtil.java:41)
at com.intellij.testFramework.fixtures.impl.CodeInsightTestFixtureImpl.lambda$tearDown$46(CodeInsightTestFixtureImpl.java:1451)
at com.intellij.testFramework.RunAll$Companion$actionSequence$1$1.invoke(RunAll.kt:72)
at com.intellij.testFramework.RunAll$Companion$actionSequence$1$1.invoke(RunAll.kt:72)
at com.intellij.testFramework.common.RunAllKt.runAllCatching(runAll.kt:56)
at com.intellij.testFramework.common.RunAllKt.runAll(runAll.kt:32)
at com.intellij.testFramework.RunAll$Companion.runAll(RunAll.kt:45)
at com.intellij.testFramework.RunAll.runAll(RunAll.kt)
at com.intellij.testFramework.fixtures.impl.CodeInsightTestFixtureImpl.tearDown(CodeInsightTestFixtureImpl.java:1407)
at com.intellij.testFramework.fixtures.BasePlatformTestCase.tearDown(BasePlatformTestCase.java:66)
at com.intellij.testFramework.UsefulTestCase.invokeTearDown(UsefulTestCase.java:455)
at com.intellij.testFramework.UsefulTestCase.defaultRunBare(UsefulTestCase.java:439)
at com.intellij.testFramework.UsefulTestCase.lambda$runBare$13(UsefulTestCase.java:515)
at com.intellij.testFramework.EdtTestUtil.lambda$runInEdtAndWait$5(EdtTestUtil.java:92)
at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:240)
at com.intellij.openapi.application.TransactionGuardImpl.access$100(TransactionGuardImpl.java:25)
at com.intellij.openapi.application.TransactionGuardImpl$1.run(TransactionGuardImpl.java:202)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runIntendedWriteActionOnCurrentThread$lambda$7(AnyThreadWriteThreadingSupport.kt:319)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction$lambda$6(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:222)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runIntendedWriteActionOnCurrentThread(AnyThreadWriteThreadingSupport.kt:318)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:928)
at com.intellij.openapi.application.impl.ApplicationImpl$4.run(ApplicationImpl.java:501)
at com.intellij.openapi.application.impl.AppImplKt.rethrowExceptions$lambda$2(appImpl.kt:66)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:102)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:102)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:108)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:102)
at com.intellij.util.concurrency.ContextRunnable.run(ContextRunnable.java:27)
at com.intellij.openapi.application.impl.AppImplKt.rethrowExceptions$lambda$3(appImpl.kt:77)
at com.intellij.openapi.application.impl.LaterInvocator$1.run(LaterInvocator.java:105)
at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:117)
at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:43)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:781)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:728)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:722)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:750)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.kt:585)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.kt:482)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$12$lambda$11$lambda$10$lambda$9(IdeEventQueue.kt:307)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:864)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$12$lambda$11$lambda$10(IdeEventQueue.kt:306)
at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$3(IdeEventQueue.kt:958)
at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:117)
at com.intellij.ide.IdeEventQueueKt.performActivity(IdeEventQueue.kt:958)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$12(IdeEventQueue.kt:301)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.kt:341)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:207)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:92)

I have tried changing the testFramework,

I have tried bumping to gradle 8.13 + 2.14.4, same issue.

If I remove the

  useJUnit {
    useJUnitPlatform()
  }

then the junit 5 tests are just not found.

I have a lot of tests in both camps and would rather not migrate them.

Spent a little bit of time investigating opions such as:

Multiple test tasks (fiddly and horrible)
downgrading the tests to all run on junit 4 (long and horrible)
upgrading the existing BasePlaformTestCase tests to run on junit 5 (intellij-community/platform/testFramework/junit5/test/showcase at master · JetBrains/intellij-community · GitHub is less than helpful)

But really I just want it to work correctly and use the vintage stuff as it did before.

Anyone else have this problem or any hints as to what changed / how to get around it?

aiden.fry · November 17, 2025, 4:49pm

Wow, do you know what fixed it?

After painstakingly going through things one by one…. finally.

One of our test cases used LightJavaCodeInsightFixtureTestCase5

Migrated that away to isntead use LightJavaCodeInsightFixtureTestCase

Wallah, no more hundreds of test failures.

Something is leaking out of that base test class and causing all my following BasePlatform tests to fail.

But I can’t seem to reproduce it in a clean project and there is jsut too much gunk to share to deep dive.

Ill report back if i find a reproducer or a reasonable why!

Topic		Replies	Views
Regular unit tests fail with 2.5.0 Gradle Build Scripts	14	492	April 24, 2025
Java JUnit 5 test yields "Can't determine test data path for strategy 'COMMUNITY'" IntelliJ Platform	1	121	May 20, 2025
Switching `org.jetbrains.intellij.platform` from 2.5.0 to 2.6.0 will break Integration tests Gradle Build Scripts	1	140	June 13, 2025
com.intellij.testFramework.UsefulTestCase not found in 2025.1 IntelliJ Platform	2	109	April 21, 2025
UI-Integration Testing IntelliJ Platform	7	275	October 27, 2025

Introduced in 2.6.0 Running BasePlatformTestCase alongside Junit Platform fails

Related topics