LibTest/async/Stream/skipWhile_A02_t01.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.

/// @assertion Stream<T> skipWhile(bool test(T element))
/// Skip data events from this stream while they are matched by test.
/// Error and done events are provided by the returned stream unmodified.
/// Starting with the first data event where test returns false for the event
/// data, the returned stream will have the same events as this stream.
/// @description Checks that error events in input stream are propagated
/// to the returned stream.
/// @author a.semenov@unipro.ru

library skipWhile_A02_t01;

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.skipWhile(test));
}

void test(CreateStreamWithErrorsFunction create) {
  check(create([1, 2, 3], isError: (_) => true, defVal: 42), (_) => false, [],
      [1, 2, 3]);
  check<int>(create<int>([1, 2, 3, 4, 5], isError: (x) => x.isOdd, defVal: 42),
      (x) => x < 4, [4], [1, 3, 5]);
  check(create<int>([1, 2, 3, 4, 5], isError: (x) => x.isOdd, defVal: 42),
      (x) => x == 1, [2, 4], [1, 3, 5]);
  check(create<int>([1, 2, 3, 4, 5], isError: (x) => x.isEven, defVal: 42),
      (x) => x == 1, [3, 5], [2, 4]);
  check(create<int>([1, 2, 3, 4, 5], isError: (x) => x < 5, defVal: 42),
      (x) => x == 5, [], [1, 2, 3, 4]);
}