| /* |
| * 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 Future<dynamic> firstWhere(bool test(T element), {Object defaultValue()}) |
| * Finds the first element of this stream matching test. |
| * Returns a future that is filled with the first element of this stream that test returns true for. |
| * @description Checks that if element is found, it is passed to the resulting future. |
| * @author kaigorodov |
| */ |
| |
| import "dart:async"; |
| import "../../../Utils/async_utils.dart"; |
| import "../../../Utils/expect.dart"; |
| |
| void check1(Iterable data, bool test(int element), var expected) { |
| Stream s=new Stream.fromIterable(data); |
| asyncStart(); |
| Future f=s.firstWhere(test); |
| f.then((int actual){ |
| Expect.equals(expected, actual); |
| asyncEnd(); |
| }); |
| } |
| |
| void check2(Iterable data, bool test(int element), var expected) { |
| Stream s=new Stream.fromIterable(data); |
| asyncStart(); |
| Future f=s.firstWhere( |
| test, |
| defaultValue:(){ |
| Expect.fail("should not be called"); |
| } |
| ); |
| f.then((int actual){ |
| Expect.equals(expected, actual); |
| asyncEnd(); |
| }); |
| } |
| |
| void check(Iterable data, bool test(int element), var expected) { |
| check1(data, test, expected); |
| check2(data, test, expected); |
| } |
| |
| main() { |
| check([1,2,3], (int element)=>true, 1); |
| check([1,2,3], (int element)=>element!=null, 1); |
| check([1,2,3,null], (int element)=>element==null, null); |
| check([1,2,3], (int element)=>element>2, 3); |
| check(new Iterable.generate(10, (int index)=>index*5), (int element)=>element!=30, 0); |
| check(new Iterable.generate(10, (int index)=>index*5), (int element)=>element==30, 30); |
| } |