LibTest/collection/DoubleLinkedQueue/reduce_A02_t01.dart

// Copyright (c) 2016, 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 abstract E reduce(E combine(E value, E element))
/// The iterable must have at least one element.
/// @description Checks that error state exception is thrown if queue is empty.
/// @author iarkh@unipro.ru


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

test (combine, element) {
  return combine + element;
}

main() {
  DoubleLinkedQueue queue = new DoubleLinkedQueue();
  Expect.throws(() { queue.reduce(test); }, (e) => e is StateError);
}