lrn@google.com
7e9e78d159
Also make Stream.firstm, Stream.single and Stream.elementAt cancel their subscription before completing the future, instead of after. BUG=http://dartbug.com/7964 Review URL: https://codereview.chromium.org//13625003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@21140 260f80e4-7a28-3924-810f-c04153c831b5
28 lines
810 B
Dart
28 lines
810 B
Dart
// Copyright (c) 2012, 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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// Regression test for http://dartbug.com/7964
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library first_regression_test;
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import 'dart:async';
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import '../../../pkg/unittest/lib/unittest.dart';
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class DoubleTransformer<T> extends StreamEventTransformer<T, T> {
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void handleData(T data, EventSink<T> sink) {
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sink.add(data);
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sink.add(data);
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}
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}
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main() {
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test("Double event before first", () {
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// This should not crash. Did crash by trying to complete future more
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// than once.
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new Stream.fromIterable([1, 2])
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.transform(new DoubleTransformer())
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.first
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.then(expectAsync1((e) {}));
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});
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}
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