blob: dc98f90f00139669e3d2639b266f0f8f9ea48776 [file] [log] [blame]
// 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> takeWhile(bool test(E element))
/// The filtering happens lazily.
/// @description Checks that [test] is not invoked until returned
/// [Iterable] is not iterated.
/// @author msyabro
import "../../../Utils/expect.dart";
main() {
var count = 0;
test(e) {
return true;
var runes = new Runes('abc');
var res = runes.takeWhile(test);
Expect.equals(0, count);
Expect.equals(1, count);