// 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.

// @dart = 2.9

/// @assertion SplayTreeSet([int compare(E key1, E key2),
/// bool isValidKey(potentialKey)])
/// Create a new SplayTreeSet with the given compare function.
/// @description Checks that if the compare function is provided it is used for
/// elements comparison
/// @author sgrekhov@unipro.ru

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

int compare(key1, key2) {
  return 0;
}

main() {
  SplayTreeSet set = new SplayTreeSet(compare);
  set.add(1);
  set.add(2);
  set.add("3");
  set.add(null);

  Expect.equals(1, set.length);
  Expect.equals(1, set.elementAt(0));
}