LibTest/collection/DoubleLinkedQueue/singleWhere_A01_t01.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 abstract E singleWhere(bool test(E value))
 * Returns the single element that satisfies [test].
 * @description Checks that the single element that satisfies the given predicate [test]
 * is returned.
 * @author kaigorodov
 */

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

check(List a, test(value), int expected) {
  DoubleLinkedQueue queue = new DoubleLinkedQueue.from(a);
  int actual=queue.singleWhere(test);
  Expect.equals(expected, actual);
}

main() {
  check([1,2,-3,0], (value)=>value>1, 2);
  check(const[1,2,-5,-6], (value)=>value==1, 1);
}