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// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// @dart = 2.9
import 'package:expect/expect.dart';
import 'dart:async';
_defaultData(x) {}
_defaultError(e, [st]) {}
_defaultDone() {}
/// Dummy StreamSubscription.
class MyStreamSubscription<T> implements StreamSubscription<T> {
final Stream stream;
final bool cancelOnError;
Function handleData = null;
Function handleError = null;
Function handleDone = null;
MyStreamSubscription(this.stream, this.cancelOnError);
Future cancel() => null;
void onData(void handleData(T data)) {
this.handleData = handleData == null ? _defaultData : handleData;
}
void onError(Function handleError) {
this.handleError = handleError == null ? _defaultError : handleError;
}
void onDone(void handleDone()) {
this.handleDone = handleDone == null ? _defaultDone : handleDone;
}
void pause([Future resumeSignal]) {}
void resume() {}
final isPaused = false;
Future<E> asFuture<E>([E futureValue]) => null;
}
main() {
var transformer = new StreamTransformer<int, String>(
(stream, cancelOnError) =>
new MyStreamSubscription(stream, cancelOnError));
var controller = new StreamController<int>(sync: true);
var stream = controller.stream;
var transformed = stream.transform(transformer);
Expect.isFalse(transformed.isBroadcast);
var handleData = (String _) => 499;
var handleError = (e, st) => 42;
var handleDone = () => 99;
MyStreamSubscription<String> subscription =
transformed.listen(handleData, onError: handleError, onDone: handleDone);
Expect.identical(stream, subscription.stream);
Expect.equals(false, subscription.cancelOnError);
Expect.identical(handleData, subscription.handleData);
Expect.identical(handleError, subscription.handleError);
Expect.identical(handleDone, subscription.handleDone);
// Note that we reuse the transformer.
controller = new StreamController(sync: true);
stream = controller.stream;
transformed = stream.transform(transformer);
subscription = transformed.listen(null);
Expect.identical(stream, subscription.stream);
Expect.equals(false, subscription.cancelOnError);
Expect.identical(_defaultData, subscription.handleData);
Expect.identical(_defaultError, subscription.handleError);
Expect.identical(_defaultDone, subscription.handleDone);
controller = new StreamController(sync: true);
stream = controller.stream;
transformed = stream.transform(transformer);
subscription =
transformed.listen(null, onDone: handleDone, cancelOnError: true);
Expect.identical(stream, subscription.stream);
Expect.equals(true, subscription.cancelOnError);
Expect.identical(_defaultData, subscription.handleData);
Expect.identical(_defaultError, subscription.handleError);
Expect.identical(handleDone, subscription.handleDone);
controller = new StreamController.broadcast(sync: true);
stream = controller.stream;
transformed = stream.transform(transformer);
Expect.isTrue(transformed.isBroadcast);
subscription =
transformed.listen(null, onDone: handleDone, cancelOnError: true);
Expect.identical(stream, subscription.stream);
Expect.equals(true, subscription.cancelOnError);
Expect.identical(_defaultData, subscription.handleData);
Expect.identical(_defaultError, subscription.handleError);
Expect.identical(handleDone, subscription.handleDone);
}