| // 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 (which are before first n data |
| /// events) are submitted to the returned stream. Checks that the resulting |
| /// stream ends with a done event. |
| /// @author a.semenov@unipro.ru |
| |
| library take_A01_t02; |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| void check<T>( |
| Stream<T> s, int count, List<T> expectedData, List expectedErrors) { |
| AsyncExpect.events(expectedData, expectedErrors, s.take(count)); |
| } |
| |
| void test(CreateStreamWithErrorsFunction create) { |
| check(create([1, 2, 3], isError: (_) => true, defaultValue: 42), 0, [], []); |
| check(create([1, 2, 3], isError: (_) => true, defaultValue: 42), |
| 1, [], [1, 2, 3]); |
| check(create([1, 2, 3], isError: (_) => true, defaultValue: 42), |
| 10, [], [1, 2, 3]); |
| |
| check(create<int>([1, 2, 3, 4, 5], isError: (x) => x.isOdd, defaultValue: 42), |
| 10, [2, 4], [1, 3, 5]); |
| check(create<int>([1, 2, 3, 4, 5], isError: (x) => x.isOdd, defaultValue: 42), |
| 2, [2, 4], [1, 3]); |
| check(create<int>([1, 2, 3, 4, 5], isError: (x) => x.isEven, defaultValue: 42), |
| 1, [1], []); |
| check(create<int>([1, 2, 3, 4, 5], isError: (x) => x.isEven, defaultValue: 42), |
| 2, [1, 3], [2]); |
| |
| check(create<int>([1, 2, 3, 4, 5], isError: (x) => x < 4, defaultValue: 42), |
| 1, [4], [1, 2, 3]); |
| check(create<int>([1, 2, 3, 4, 5], isError: (x) => x > 2, defaultValue: 42), |
| 2, [1, 2], []); |
| } |