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()})
 * Returns the last element that satisfies the given predicate test.
 * If none matches, the result of invoking the orElse function is returned.
 * By default, when orElse is null, a StateError is thrown.
 * @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 Object();

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