LibTest/core/Runes/where_A03_t01.dart

// Copyright (c) 2013, 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 Iterable<E> where(bool test(E element))
 * Iterating multiple times over the the returned [Iterable]
 * will invoke the supplied function [test] multiple times on the same element.
 * @description Checks that iterating multiple times over the the returned
 * [Iterable] will invoke the supplied function [test] multiple times on the
 * same element.
 * @author msyabro
 */
import "../../../Utils/expect.dart";

main() {
  var count = 0;
  test(e) {
    ++count;
    return true;
  }

  var runes = new Runes('abc');
  var res = runes.where(test);

  res.elementAt(0);
  Expect.equals(1,count);

  res.elementAt(0);
  Expect.equals(2,count);

  res.elementAt(1);
  Expect.equals(4,count);

  res.elementAt(2);
  Expect.equals(7,count);
}