| /* |
| * 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 transform(StreamTransformer<T, dynamic> streamTransformer) |
| * Chains this stream as the input of the provided StreamTransformer. |
| * Returns the result of streamTransformer.bind itself. |
| * @description Checks that the data and error events are produced according |
| * to transform. |
| * @author a.semenov@unipro.ru |
| */ |
| library transform_A01_t01; |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| StreamTransformer<int, int> passThrough = new StreamTransformer.fromHandlers(); |
| StreamTransformer<int, int> doubleDataNegateError = |
| new StreamTransformer.fromHandlers( |
| handleData: (int event, EventSink<int> sink){ |
| sink.add(event); |
| sink.add(event); |
| }, |
| handleError: (Object error, StackTrace st, EventSink<int> sink) { |
| sink.addError(-(error as int)); |
| } |
| ); |
| |
| void check<T,S>(Stream<T> s, StreamTransformer<T,S> transformer, |
| List<S> expectedData, List expectedErrors) { |
| AsyncExpect.events(expectedData, expectedErrors, s.transform(transformer)); |
| } |
| |
| void test(CreateStreamWithErrorsFunction create) { |
| check(create([1,2,3,4,5]), passThrough, [1,2,3,4,5], []); |
| check(create([1,2,3,4,5], isError: (x) => x.isOdd), passThrough, [2,4], [1,3,5]); |
| check(create([1,2,3,4,5], isError: (x) => true), passThrough, [], [1,2,3,4,5]); |
| |
| check(create([1,2,3,4,5]), doubleDataNegateError, [1,1,2,2,3,3,4,4,5,5], []); |
| check( |
| create([1,2,3,4,5], isError: (x) => x.isOdd), |
| doubleDataNegateError, |
| [2,2,4,4], |
| [-1,-3,-5] |
| ); |
| check( |
| create([1,2,3,4,5], isError: (x) => true), |
| doubleDataNegateError, |
| [], |
| [-1,-2,-3,-4,-5] |
| ); |
| } |