LibTest/async/Stream/where_A01_t02.test.dart

// 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]);
}