// 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  abstract void removeAll(Iterable<Object> elements)
/// Removes each element of elements from this set.
/// @description Passes a list containing null as argument to removeAll(),
/// expects no errors.
/// @author sgrekhov@unipro.ru

library retainAll_A01_t02;
import "set.lib.dart";
import "../../../Utils/expect.dart";

test(Set create([Set content])) {
  Set set = create();
  set.retainAll([null].toSet());
  Expect.equals(0, set.length);
  set.retainAll([1, 2, null].toSet());
  Expect.equals(0, set.length);

  set.addAll([1, 2, 3, 4]);
  set.retainAll([null].toSet());
  Expect.equals(0, set.length);
  set.add(null);
  set.retainAll([null].toSet());
  Expect.equals(1, set.length);
}

main() {
  test(create);
}