| /* |
| * Copyright (c) 2015, 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 Execution of a for-in statement of the form await for |
| * (finalConstVarOrType? id in e) s proceeds as follows: |
| * The expression e is evaluated to an object o. It is a dynamic error if o |
| * is not an instance of a class that implements Stream. Otherwise, |
| * the expression await vf is evaluated, where vf is a fresh variable |
| * whose value is a fresh instance f implementing the built-in class Future. |
| * The stream o is listened to, and on each data event in o |
| * the statement s is executed with id bound to the value of the current |
| * element of the stream. If s raises an exception, or if o raises |
| * an exception, then f is completed with that exception. Otherwise, when |
| * all events in the stream o have been processed, f is completed with null. |
| * |
| * @description Check that if s raises an exception, then asynchronous for-in |
| * statement is completed with that exception. |
| * @author a.semenov@unipro.ru |
| */ |
| import 'dart:async'; |
| import '../../../../Utils/expect.dart'; |
| |
| final ERROR = new Exception(); |
| |
| Future test1() async { |
| var processedValues = []; |
| try { |
| await for (var i in new Stream.fromIterable([1, 2])) { |
| processedValues.add(i); |
| throw ERROR; |
| } |
| Expect.fail("Asynchronous for-in statement should throw $ERROR"); |
| } catch (e) { |
| Expect.identical(ERROR, e); |
| } |
| Expect.listEquals([1], processedValues); |
| } |
| |
| Future test2() async { |
| var processedValues = []; |
| try { |
| await for (int i in new Stream.empty()) { |
| processedValues.add(i); |
| throw ERROR; |
| } |
| Expect.listEquals([], processedValues); |
| } catch (e) { |
| Expect.fail("Asynchronous for-in statement should not throw $e " + |
| "for empty stream"); |
| } |
| } |
| |
| main() { |
| asyncStart(); |
| Future.wait([test1(), test2()]).then((v) => asyncEnd()); |
| } |