| // Copyright (c) 2011, 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. |
| |
| /// @assertion Stream<T> take(int count) |
| /// Provides at most the first n values of this stream. |
| /// Forwards the first n data events of this stream, and all error events, |
| /// to the returned stream, and ends with a done event. |
| /// If this stream produces fewer than count values before it's done, |
| /// so will the returned stream. |
| /// @description Checks that all error events are returned. Checks that |
| /// the resulting stream ends with a done event. |
| /// @author kaigorodov |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| import "IsolateStream.dart" as IsolateStream; |
| |
| void check(int eventCount, int takeCount, int expectedErrorCount) { |
| Iterable it = new Iterable.generate(eventCount, (int index) => index); |
| Stream s = |
| IsolateStream.fromIterable(it).map((x) => throw new ArgumentError(x)); |
| Stream t = s.take(takeCount); |
| int seenCount = 0; |
| asyncStart(); |
| t.listen((value) { |
| Expect.fail("datum not expected"); |
| }, onError: (error) { |
| Expect.isTrue(error is ArgumentError, error.toString()); |
| var message = (error as ArgumentError).message; |
| Expect.equals(seenCount, message); |
| seenCount++; |
| }, onDone: () { |
| Expect.equals(expectedErrorCount, seenCount); |
| asyncEnd(); |
| }); |
| } |
| |
| main() { |
| check(0, 0, 0); |
| check(0, 1, 0); |
| check(1, 0, |
| 0); // see issue https://github.com/dart-lang/co19/issues/81 for details |
| check(1, 1, 1); |
| check(2, 3, 2); |
| check(3, 2, 3); |
| } |