platform/sandbox/reactivex/test/transformers/timeout_test.dart

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import 'dart:async';
import 'package:test/test.dart';
void main() {
test('Rx.timeout', () async {
late StreamSubscription<int> subscription;
final stream = Stream<int>.fromFuture(
Future<int>.delayed(Duration(milliseconds: 30), () => 1))
.timeout(Duration(milliseconds: 1));
subscription = stream.listen((_) {},
onError: expectAsync2((Object e, StackTrace s) {
expect(e is TimeoutException, isTrue);
subscription.cancel();
}, count: 1));
});
}