LibTest/collection/DoubleLinkedQueue/forEachEntry_A01_t03.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 void forEachEntry(void f(DoubleLinkedQueueEntry<E> element))
 * @description Checks that something is thrown when the argument is null or
 * has a type that is incompatible with the required function type.
 * @static-warning
 * @author kaigorodov
 */

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

main() {
  DoubleLinkedQueue queue = new DoubleLinkedQueue();
  
  //empty queue just ignores invalid arg 
  queue.forEachEntry(null);
  checkTypeError(() => queue.forEachEntry(0)); /// static type warning

  queue.addLast(1);
  Expect.throws(() => queue.forEachEntry(null));
  Expect.throws(() => queue.forEachEntry(1)); /// static type warning
  Expect.throws(() => queue.forEachEntry(1.1)); /// static type warning
  Expect.throws(() => queue.forEachEntry("1")); /// static type warning
}