// Copyright (c) 2017, 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 LinkedHashSet<E> class implements Set<E>
/// The [LinkedHashSet] also keep track of the order that elements were inserted
/// in, and iteration happens in first-to-last insertion order.
/// @description Checks that [LinkedHashSet] preserves insertion order for its
/// elements.
/// @author iarkh@unipro.ru

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

checkOrder(LinkedHashSet set, List list, dynamic value) {
  set.add(value);
  list.add(value);
  int i = 0;
  for(var k in set) {
    Expect.equals(list[i++], k);
  }
}

main() {
  LinkedHashSet set = new LinkedHashSet();
  List list = new List();
  checkOrder(set, list, 0);
  checkOrder(set, list, 2);
  checkOrder(set, list, "test");
  checkOrder(set, list, "test1");
  checkOrder(set, list, -23);
  checkOrder(set, list, 4);
  checkOrder(set, list, []);
  checkOrder(set, list, 15);
  checkOrder(set, list, new Object());
}