Has anyone had issues with `assertFailsWith`? When...

# testing

[Joffrey]

Has anyone had issues with assertFailsWith?
When using it in a multiplatform project, I can consistently reproduce an issue on the JS platform (everything is fine on JVM).
When I use assertFailsWith(SomeException::class) everything works as expected (the exception is thrown, the test pass). When I use assertFailsWith<SomeException> variant, the test fails as if no exception was thrown by the block.
Only a couple of my tests work properly no matter the form used, but all the others fail consistently with the 2nd form and succeed with the 1st form, and I have no idea how this is possible, both are inline functions calling the same 3rd function… I really don’t get it.

[Joffrey]

Looks like it creates a CoroutinesInternalError somehow, because I can see this in the standard output before the test fails:

oroutinesInternalError{message_q7r8iu$_0: 'Fatal exception in coroutines machinery for CancellableContinuation(DispatchedContinuation[WindowDispatcher@1, [object Object]]){CancelledContinuation[JobCancellationException: Parent job is Cancelling; job=TimeoutCoroutine(timeMillis=1000){Cancelled}@2]}@3. Please read KDoc to 'handleFatalException' method and report this incident to maintainers', cause_us9j0c$_0: ClassCastException{message_8yp7un$_0: 'Illegal cast', cause_th0jdv$_0: null, name: 'ClassCastException'}, name: 'CoroutinesInternalError'

[Joffrey]

On nodeJS, the output is easier to read:

CoroutinesInternalError: Fatal exception in coroutines machinery for CancellableContinuation(DispatchedContinuation[NodeDispatcher@1, [object Object]]){CancelledContinuation[JobCancellationException: Parent job is Cancelling; job=TimeoutCoroutine(timeMillis=1000){Cancelled}@2]}@3. Please read KDoc to 'handleFatalException' method and report this incident to maintainers
    at CancellableContinuationImpl.DispatchedTask.handleFatalException_mseuzz$ (/Users/jbion/projects/krossbow/build/js/packages_imported/kotlinx-coroutines-core/1.3.3/kotlinx-coroutines-core.js:32457:16)
    at CancellableContinuationImpl.DispatchedTask.run (/Users/jbion/projects/krossbow/build/js/packages_imported/kotlinx-coroutines-core/1.3.3/kotlinx-coroutines-core.js:32450:10)
    at SetTimeoutBasedDispatcher$ScheduledMessageQueue.MessageQueue.process (/Users/jbion/projects/krossbow/build/js/packages_imported/kotlinx-coroutines-core/1.3.3/kotlinx-coroutines-core.js:35741:15)
    at /Users/jbion/projects/krossbow/build/js/packages_imported/kotlinx-coroutines-core/1.3.3/kotlinx-coroutines-core.js:35557:30
    at processTicksAndRejections (internal/process/task_queues.js:75:11) {
  'message_q7r8iu$_0': "Fatal exception in coroutines machinery for CancellableContinuation(DispatchedContinuation[NodeDispatcher@1, [object Object]]){CancelledContinuation[JobCancellationException: Parent job is Cancelling; job=TimeoutCoroutine(timeMillis=1000){Cancelled}@2]}@3. Please read KDoc to 'handleFatalException' method and report this incident to maintainers",
  'cause_us9j0c$_0': ClassCastException: Illegal cast
      at throwCCE_0 (/Users/jbion/projects/krossbow/build/js/packages_imported/kotlin/1.3.70/kotlin/exceptionUtils.kt:15:11)
      at NodeDispatcher.CoroutineDispatcher.releaseInterceptedContinuation_k98bjh$ (/Users/jbion/projects/krossbow/build/js/packages_imported/kotlinx-coroutines-core/1.3.3/kotlinx-coroutines-core.js:1896:84)
      at Coroutine$StompSessionReceiptTests$send_autoReceipt_failsOnWebSocketError$lambda.CoroutineImpl.releaseIntercepted_0 (/Users/jbion/projects/krossbow/build/js/packages_imported/kotlin/1.3.70/kotlin/coroutines/CoroutineImpl.kt:75:48)
      at Coroutine$sendAndWaitForReceipt_0.CoroutineImpl.resumeWith_tl1gpc$ (/Users/jbion/projects/krossbow/build/js/packages_imported/kotlin/1.3.70/kotlin/coroutines/CoroutineImpl.kt:56:17)
      at ScopeCoroutine.afterResume_s8jyv4$ (/Users/jbion/projects/krossbow/build/js/packages_imported/kotlinx-coroutines-core/1.3.3/kotlinx-coroutines-core.js:33020:14)
      at ScopeCoroutine.AbstractCoroutine.resumeWith_tl1gpc$ (/Users/jbion/projects/krossbow/build/js/packages_imported/kotlinx-coroutines-core/1.3.3/kotlinx-coroutines-core.js:412:8)
      at Coroutine$sendText_61zpoe$.CoroutineImpl.resumeWith_tl1gpc$ (/Users/jbion/projects/krossbow/build/js/packages_imported/kotlin/1.3.70/coroutines/Continuation.kt:53:5)
      at CancellableContinuationImpl.DispatchedTask.run (/Users/jbion/projects/krossbow/build/js/packages_imported/kotlinx-coroutines-core/1.3.3/kotlinx-coroutines-core.js:32427:22)
      at SetTimeoutBasedDispatcher$ScheduledMessageQueue.MessageQueue.process (/Users/jbion/projects/krossbow/build/js/packages_imported/kotlinx-coroutines-core/1.3.3/kotlinx-coroutines-core.js:35741:15)
      at /Users/jbion/projects/krossbow/build/js/packages_imported/kotlinx-coroutines-core/1.3.3/kotlinx-coroutines-core.js:35557:30
      at processTicksAndRejections (internal/process/task_queues.js:75:11) {
    'message_8yp7un$_0': 'Illegal cast',
    'cause_th0jdv$_0': null,
    name: 'ClassCastException'
  },
  name: 'CoroutinesInternalError'
}