| // 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> handleError(Function onError, {bool test(error)}) |
| /// Creates a wrapper Stream that intercepts some errors from this stream. |
| /// If this stream sends an error that matches test, then it is intercepted by |
| /// the onError function. |
| /// An asynchronous error e is matched by a test function if test(e) returns |
| /// true. |
| /// @description Checks that an error e intercepted by [onError] function |
| /// if test(e) returns true. |
| /// @author a.semenov@unipro.ru |
| |
| library handleError_A01_t01; |
| |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| void check( |
| Stream s, bool test(error), List data, List intercepted, List expected) { |
| List actualIntercepted = []; |
| List actualErrors = []; |
| List actualData = []; |
| asyncStart(); |
| s.handleError((error) => actualIntercepted.add(error), test: test).listen( |
| (data) { |
| actualData.add(data); |
| }, onError: (error) { |
| actualErrors.add(error); |
| }, onDone: () { |
| Expect.listEquals(data, actualData); |
| Expect.listEquals(intercepted, actualIntercepted); |
| Expect.listEquals(expected, actualErrors); |
| asyncEnd(); |
| }); |
| } |
| |
| void test(CreateStreamWithErrorsFunction create) { |
| check(create([], defaultValue: 42), (x) => true, [], [], []); |
| check(create([], isError: (x) => true, defaultValue: 42), |
| (x) => true, [], [], []); |
| check(create([1, 2, 3, 4, 5], isError: (x) => true, defaultValue: 42), |
| (x) => x.isEven, [], [2, 4], [1, 3, 5]); |
| |
| check( |
| create(["a", 1, "b", 2, "c", 3, "d", 4, "e", 5, "f"], |
| isError: (x) => x is int, defaultValue: 42), |
| (x) => (x is int && x.isEven), // test function |
| ["a", "b", "c", "d", "e", "f"], // expected data |
| [2, 4], // intercepted errors |
| [1, 3, 5] // passed through errors |
| ); |
| } |