LibTest/collection/Queue/clear_A01_t01.test.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  void clear()
/// Removes all elements in the queue. The size of the queue becomes zero.
/// @description Check that all elements of the queue removed.
/// @author msyabro

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

test(Queue create([Iterable content])) {
  Queue queue = create();
  queue.clear();
  Expect.isTrue(queue.isEmpty);
  
  queue.addFirst(1);
  queue.addFirst(1);
  Expect.isFalse(queue.isEmpty);
  queue.clear();
  Expect.isTrue(queue.isEmpty);

  queue.clear();
  Expect.isTrue(queue.isEmpty);
  for(int i = 0; i < 1000; i++) {
    queue.add(i);
  }
  queue.clear();
  Expect.isTrue(queue.isEmpty);
}