hint.txt

Did you add the onError to the listen() method?

main.dart

import 'dart:async';

StreamSubscription streamWithError(Stream<String> stream) {
  return stream.listen((_) {} /* finish this method */);
}

solution.dart

StreamSubscription streamWithError(Stream<String> stream) {
  return stream.listen((_) {}, onError: (error) {});
}

test.dart

void main() async {
  var hadError = false;
  
  // catch unhandled onError
  runZoned(() {
    // ignore: close_sinks
    final streamController = StreamController<String>(sync: true);
    // ignore: cancel_subscriptions
    final subscription = streamWithError(streamController.stream);
    if (subscription == null) {
      _result(
          false, ['Something went wrong! The stream subscription is missing.']);
      hadError = true;
      return;
    }

    streamController.addError("ERROR!");
  }, onError: (e, stackTrace) {
    _result(false,
        ['Something went wrong! Looks like the error was not processed.']);
    hadError = true;
  });

  if (!hadError) {
    _result(true);
  }
}