blob: 7f71b9eb5fba1383c5f2df44044f57161486d883 [file] [log] [blame]
// 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 final E first
/// Throws a StateError if this is empty. Otherwise returns the first element in
/// the iteration order, equivalent to this.elementAt(0).
/// @description Checks that a StateError is thrown if queue is empty.
/// @author kaigorodov
import "../../../Utils/expect.dart";
import "dart:collection";
main() {
DoubleLinkedQueue queue = new DoubleLinkedQueue();
Expect.throws(() { queue.first; }, (e) => e is StateError);
Expect.throws(() { queue.first; }, (e) => e is StateError);