LibTest/collection/LinkedListEntry/previous_A01_t02.dart

// Copyright (c) 2016, 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 E previous
 * Return the predecessor of this element in its linked list.
 * Returns [null] if there is no predecessor in the linked list, or if this
 * entry is not currently in any list.
 * @description Checks that [null] is returned if there is no predecessor in the
 * linked list
 * @author sgrekhov@unipro.ru
 */
import "../../../Utils/expect.dart";
import "dart:collection";
import "LinkedListEntry.lib.dart";

main() {
  MyLinkedListEntry<int> entry = new MyLinkedListEntry<int>(1);
  LinkedList<MyLinkedListEntry> list = new LinkedList<MyLinkedListEntry<int>>();
  list.add(entry);

  Expect.isNull(entry.previous);
}