| // 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. |
| |
| // @dart = 2.9 |
| |
| /// @assertion Stream<T> where(bool test(T event)) |
| /// Creates a new stream from this stream that discards some data events. |
| /// The new stream sends the same error and done events as this stream, but it |
| /// only sends the data events that satisfy the test. |
| /// @description Checks that the new stream sends the same error and done events |
| /// as this stream. |
| /// @author kaigorodov |
| |
| library where_A01_t02; |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| void check<T>(Stream<T> s, bool test(T event), |
| List<T> expectedData, List expectedErrors) { |
| AsyncExpect.events(expectedData, expectedErrors, s.where(test)); |
| } |
| |
| void test(CreateStreamWithErrorsFunction create) { |
| check(create([1,2,3,4,5], isError: (x) => true), (e) => true, [], [1,2,3,4,5]); |
| check(create([1,2,3,4,5], isError: (x) => x.isEven), (e) => true, [1,3,5], [2,4]); |
| check(create([1,2,3,4,5], isError: (x) => x.isEven), (e) => e > 1, [3,5], [2,4]); |
| check(create([1,2,3,4,5], isError: (x) => x.isEven), (e) => false, [], [2,4]); |
| check(create([1,2,3,4,5], isError: (x) => x.isEven), (e) => throw e, [], [1,2,3,4,5]); |
| } |