| // Copyright (c) 2016, 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 T current |
| /// The current value of the stream. |
| /// |
| /// Is null before the first call to moveNext and after a call to moveNext |
| /// completes with a false result or an error. |
| /// |
| /// When a moveNext call completes with true, the current field holds the most |
| /// recent event of the stream, and it stays like that until the next call to |
| /// moveNext. Between a call to moveNext and when its returned future completes, |
| /// the value is unspecified. |
| /// |
| /// @description Checks that the property current returns null before the first |
| /// call to moveNext and after a call to moveNext completes with a false result. |
| /// @author ngl@unipro.ru |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| main() { |
| StreamController c = new StreamController(); |
| StreamIterator si = new StreamIterator(c.stream); |
| |
| Expect.isNull(si.current); |
| c.add(1); |
| Expect.isNull(si.current); |
| |
| asyncStart(); |
| si.moveNext().then((bool value) { |
| Expect.isTrue(value); |
| Expect.equals(1, si.current); |
| |
| si.moveNext().then((bool value) { |
| Expect.isFalse(value); |
| Expect.isNull(si.current); |
| asyncEnd(); |
| }); |
| |
| }); |
| |
| c.close(); |
| } |