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https://github.com/dart-lang/sdk
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b101a7d002
Change-Id: Ib33169c3e0ffc870915c189404074a1dea472546 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/196548 Reviewed-by: Bob Nystrom <rnystrom@google.com> Commit-Queue: Leaf Petersen <leafp@google.com>
106 lines
3.5 KiB
Dart
106 lines
3.5 KiB
Dart
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// @dart = 2.9
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import 'package:expect/expect.dart';
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import 'dart:async';
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_defaultData(x) {}
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_defaultError(e, [st]) {}
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_defaultDone() {}
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/// Dummy StreamSubscription.
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class MyStreamSubscription<T> implements StreamSubscription<T> {
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final Stream stream;
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final bool cancelOnError;
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Function handleData = null;
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Function handleError = null;
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Function handleDone = null;
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MyStreamSubscription(this.stream, this.cancelOnError);
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Future cancel() => null;
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void onData(void handleData(T data)) {
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this.handleData = handleData == null ? _defaultData : handleData;
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}
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void onError(Function handleError) {
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this.handleError = handleError == null ? _defaultError : handleError;
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}
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void onDone(void handleDone()) {
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this.handleDone = handleDone == null ? _defaultDone : handleDone;
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}
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void pause([Future resumeSignal]) {}
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void resume() {}
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final isPaused = false;
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Future<E> asFuture<E>([E futureValue]) => null;
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}
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main() {
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var transformer = new StreamTransformer<int, String>(
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(stream, cancelOnError) =>
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new MyStreamSubscription(stream, cancelOnError));
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var controller = new StreamController<int>(sync: true);
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var stream = controller.stream;
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var transformed = stream.transform(transformer);
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Expect.isFalse(transformed.isBroadcast);
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var handleData = (String _) => 499;
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var handleError = (e, st) => 42;
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var handleDone = () => 99;
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MyStreamSubscription<String> subscription =
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transformed.listen(handleData, onError: handleError, onDone: handleDone);
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Expect.identical(stream, subscription.stream);
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Expect.equals(false, subscription.cancelOnError);
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Expect.identical(handleData, subscription.handleData);
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Expect.identical(handleError, subscription.handleError);
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Expect.identical(handleDone, subscription.handleDone);
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// Note that we reuse the transformer.
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controller = new StreamController(sync: true);
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stream = controller.stream;
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transformed = stream.transform(transformer);
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subscription = transformed.listen(null);
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Expect.identical(stream, subscription.stream);
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Expect.equals(false, subscription.cancelOnError);
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Expect.identical(_defaultData, subscription.handleData);
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Expect.identical(_defaultError, subscription.handleError);
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Expect.identical(_defaultDone, subscription.handleDone);
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controller = new StreamController(sync: true);
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stream = controller.stream;
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transformed = stream.transform(transformer);
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subscription =
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transformed.listen(null, onDone: handleDone, cancelOnError: true);
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Expect.identical(stream, subscription.stream);
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Expect.equals(true, subscription.cancelOnError);
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Expect.identical(_defaultData, subscription.handleData);
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Expect.identical(_defaultError, subscription.handleError);
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Expect.identical(handleDone, subscription.handleDone);
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controller = new StreamController.broadcast(sync: true);
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stream = controller.stream;
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transformed = stream.transform(transformer);
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Expect.isTrue(transformed.isBroadcast);
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subscription =
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transformed.listen(null, onDone: handleDone, cancelOnError: true);
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Expect.identical(stream, subscription.stream);
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Expect.equals(true, subscription.cancelOnError);
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Expect.identical(_defaultData, subscription.handleData);
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Expect.identical(_defaultError, subscription.handleError);
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Expect.identical(handleDone, subscription.handleDone);
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}
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