LibTest/collection/DoubleLinkedQueue/any_A01_t02.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 bool any(bool f(E element))
 * Returns true if one element of this collection satisfies the predicate test.
 * Returns false otherwise.
 * @description Checks that the method returns true if at least one element
 * of this collection satisfies the predicate test.
 * @author kaigorodov
 */
import "../../../Utils/expect.dart";
import "dart:collection";

main() {
  DoubleLinkedQueue queue = new DoubleLinkedQueue();
  Expect.isFalse(queue.any((e)=>false));
  Expect.isFalse(queue.any((e)=>true));
  Expect.isFalse(queue.any((e)=>e==1));
  
  queue.addFirst(1);
  Expect.isFalse(queue.any((e)=>false));
  Expect.isFalse(queue.any((e)=>e==0));
  Expect.isTrue(queue.any((e)=>e==1));
  
  queue.addFirst(1);
  Expect.isTrue(queue.any((e)=>e==1));
  
  queue.addLast(2);
  Expect.isFalse(queue.any((e)=>e==0));
  Expect.isTrue(queue.any((e)=>e==1));
  Expect.isTrue(queue.any((e)=>e==2));
}