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import 'dart:async'; | |
import 'package:flutter_test/flutter_test.dart'; | |
import 'package:rxdart/rxdart.dart'; | |
void main() { | |
test('', () async { | |
// broadcast取ると、expectはtrueになる | |
// BehaviorSubjectでも、expectはtrueになる | |
final controller = StreamController<bool>.broadcast(); | |
// 一瞬後にtrueにしてclose | |
unawaited( | |
Future.microtask( | |
() => controller | |
..add(true) | |
..close(), | |
), | |
); | |
// concatEagerにすると、expectはtrueになる(上でaddしたtrueが捕捉される) | |
final v = await Rx.concat([ | |
Stream.value(false), | |
// concatだと、購読直前に上でaddしたtrueが先に流れてしまい捕捉されない | |
controller.stream, | |
]).last; | |
expect( | |
v, | |
false, // concatEager・mergeだとtrue | |
); | |
}); | |
} |
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