LibTest/collection/LinkedList/lastWhere_A02_t01.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 dynamic lastWhere(bool test(E value), {Object orElse()})
/// If no element satisfies [test], the result of invoking the [orElse] function
/// is returned.
/// @description Checks that if none matches, the result of invoking the [orElse]
/// function is returned.
/// @author kaigorodov

import "../../../Utils/expect.dart";
import "dart:collection";
import "LinkedList.lib.dart";

var noneMatches = new MyLinkedListEntry(new Object());

void check(LinkedList a, var element) {
  Expect.identical(noneMatches,
    a.lastWhere(
      (entry) => (entry as MyLinkedListEntry).value == element,
      orElse: () => noneMatches)
    );
}

main() {
  LinkedList a = toLinkedList([42, 0, -1, 42, -1, 6031769, 0]);
  check(a, 43);
  check(a, 2);
  check(a, -2);
  check(a, 6031768);
}