LibTest/collection/HashSet/HashSet.from_A01_t01.dart

// Copyright (c) 2011, 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 interface HashSet.from(Iterable elements)
/// Create a hash set containing all [elements].
/// @description Checks that created hash set contains all elements of [elements].
/// Both empty and non-empty argument collections are tested.
/// @author rodionov

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

main() {
  HashSet<int> set = new HashSet.from([1, 2, 3, 4, 5]);
  Expect.setEquals(set, [1, 2, 3, 4, 5]);
  
  Queue q = new Queue.from([1, 2, 3, 4, 5]);
  set = new HashSet.from(q);
  Expect.setEquals(set, q);
  
  HashSet tmp = new HashSet();
  tmp.add(1);
  tmp.add(2);
  set = new HashSet.from(tmp);
  Expect.setEquals(set, tmp);
  
  set = new HashSet.from(new Set());
  Expect.setEquals(set, []);
  
  set = new HashSet.from([]);
  Expect.setEquals(set, []);
  
  set = new HashSet.from(new HashSet());
  Expect.setEquals(set, []);
}