LibTest/collection/DoubleLinkedQueue/toSet_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.
 */
/**
 * @assertion Set<E> toSet()
 * Creates a Set containing the elements of this Iterable.
 * @description Checks that proper Set with correct element order is created.
 * @author kaigorodov
 */

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

void checkEquals(Iterable expected, Set actual) {
  Set set0=new Set();
  for (var el in expected) {
    set0.add(el);
  }
  Expect.isTrue(set0.containsAll(actual));
  Expect.isTrue(actual.containsAll(set0));
}

main() {
  DoubleLinkedQueue q = new DoubleLinkedQueue();
  Set a = q.toSet();
  Expect.equals(0, a.length);
  Expect.equals(0, q.length);

  q.addAll([1,"2","3","4","5", "4", 1]);
  a = q.toSet();
  checkEquals(q, a);

  DoubleLinkedQueue src = new DoubleLinkedQueue.from([null, [null], [], [1,2,3], [[null]]]);
  a = src.toSet();
  checkEquals(src, a);
}