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

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import 'dart:async';
import 'package:test/test.dart';
void main() {
test('Rx.distinct', () async {
const expected = 1;
final stream = Stream.fromIterable(const [expected, expected]).distinct();
stream.listen(expectAsync1((actual) {
expect(actual, expected);
}));
});
test('Rx.distinct accidental broadcast', () async {
final controller = StreamController<int>();
final stream = controller.stream.distinct();
stream.listen(null);
expect(() => stream.listen(null), throwsStateError);
controller.add(1);
});
}