LibTest/collection/Queue/Queue.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.

/// @assertion Queue.from(Iterable elements)
/// Creates a queue containing all elements.
/// The element order in the queue is as if the elements were added using
/// [addLast] in the order provided by [elements.iterator].
/// @description Checks that created list contains all elements of [elements] in
/// the same order.
/// @author msyabro

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

void check(Queue l, Iterable c) {
  Expect.isTrue(l.length == c.length);
  c.forEach((var element) {
    Expect.isTrue(l.removeFirst() == element);
  });
}

main() {
  Queue list = new Queue.from([1, 2, 3, 4, 5]);
  check(list, [1, 2, 3, 4, 5]);
  
  Set set = new Set.from([1, 2, 3, 4, 5]);
  list = new Queue.from(set);
  check(list, set);
  
  Queue tmp = new Queue();
  tmp.addLast(1);
  tmp.addLast(2);
  list = new Queue.from(tmp);
  check(list, tmp);
  
  list = new Queue.from(new Queue());
  check(list, []);
  
  list = new Queue.from([tmp, tmp, set]);
  check(list, [tmp, tmp, set]);
  
  list = new Queue.from(new Set());
  check(list, []);
}