| // 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<bool> contains(Object needle) |
| /// Completes the Future when the answer is known. |
| /// @description Checks that the Future is completed when the answer is known. |
| /// @author kaigorodov |
| /// @author a.semenov@unipro.ru |
| |
| library contains_A02_t01; |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| void check<T>(Stream<T> s, Object? match, bool expected) { |
| List seen = []; |
| s = s.map((x) { |
| seen.add(x); |
| return x; |
| }); |
| asyncStart(); |
| s.contains(match).then((actual) { |
| Expect.equals(expected, actual); |
| if (expected) { |
| Expect.equals(match, seen.last); |
| Expect.equals(seen.length-1, seen.indexOf(match)); |
| } else { |
| Expect.isFalse(seen.contains(match)); |
| } |
| asyncEnd(); |
| }); |
| } |
| |
| void test(CreateStreamFunction create) { |
| check(create([]), null, false); |
| check(create([1, 2 ,[]]), null, false); |
| check(create([1, 2 ,null, []]), null, true); |
| check(create([1, 2, []]), 4, false); |
| check(create([1, 2, null, []]), 2, true); |
| check(create([1, 2, 1, 2, 3]), 2, true); |
| } |