// 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 K firstKeyAfter(K key)
/// Returns [null] if no [key] was not found.
/// @description Checks that [null] is returned if no [key] was found
/// @author sgrekhov@unipro.ru

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

main() {
  SplayTreeMap map = new SplayTreeMap();
  Expect.isNull(map.firstKeyAfter(1));

  map[0] = null;
  Expect.isNull(map.firstKeyAfter(1));
}