| // 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> takeWhile(bool test(T element)) |
| /// Forwards data events while test is successful. |
| /// The returned stream provides the same events as this stream as long as test |
| /// returns true for the event data. |
| /// The stream is done when either this stream is done, or when this stream |
| /// first provides a value that test doesn't accept. |
| /// @description Checks that all error events (which occur before the returned |
| /// stream is done) are submitted to the returned stream. |
| /// Checks that the resulting stream ends with a done event. |
| /// @author a.semenov@unipro.ru |
| |
| library takeWhile_A01_t02; |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| void check<T>(Stream<T> s, bool test(T element), List<T> expectedData, |
| List expectedErrors) { |
| AsyncExpect.events(expectedData, expectedErrors, s.takeWhile(test)); |
| } |
| |
| void test(CreateStreamWithErrorsFunction create) { |
| check(create([1, 2, 3], isError: (_) => true, defaultValue: 42), (x) => false, |
| [], [1, 2, 3]); |
| check(create([1, 2, 3], isError: (_) => true, defaultValue: 42), (x) => true, |
| [], [1, 2, 3]); |
| |
| check(create<int>([1, 2, 3, 4, 5], isError: (x) => x.isOdd, defaultValue: 42), |
| (x) => false, [], [1]); |
| check<int>( |
| create<int>([1, 2, 3, 4, 5], isError: (x) => x.isOdd, defaultValue: 42), |
| (x) => x < 4, [2], [1, 3]); |
| check(create<int>([1, 2, 3, 4, 5], isError: (x) => x.isEven, defaultValue: 42), |
| (x) => false, [], []); |
| check<int>( |
| create<int>([1, 2, 3, 4, 5], isError: (x) => x.isEven, defaultValue: 42), |
| (x) => x < 4, [1, 3], [2, 4]); |
| |
| check(create<int>([1, 2, 3, 4, 5], isError: (x) => x < 4, defaultValue: 42), |
| (x) => true, [4, 5], [1, 2, 3]); |
| check(create<int>([1, 2, 3, 4, 5], isError: (x) => x < 4, defaultValue: 42), |
| (x) => false, [], [1, 2, 3]); |
| check<int>( |
| create<int>([1, 2, 3, 4, 5], isError: (x) => x < 4, defaultValue: 42), |
| (x) => x > 2, [4, 5], [1, 2, 3]); |
| check<int>( |
| create<int>([1, 2, 3, 4, 5], isError: (x) => x > 2, defaultValue: 42), |
| (x) => x < 3, [1, 2], [3, 4, 5]); |
| } |