blob: c31f3ac097c3e76b86795da34a2f6bda3c7a7061 [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.
// @dart = 2.9
import "package:expect/expect.dart";
class ListIteratorsTest {
static void checkListIterator(List a) {
Iterator it = a.iterator;
Expect.isNull(it.current);
for (int i = 0; i < a.length; i++) {
Expect.isTrue(it.moveNext());
var elem = it.current;
Expect.equals(a[i], elem);
}
Expect.isFalse(it.moveNext());
Expect.isNull(it.current);
}
static testMain() {
checkListIterator([]);
checkListIterator([1, 2]);
checkListIterator(new List(0));
checkListIterator(new List(10));
checkListIterator(new List());
List g = new List();
g.addAll([1, 2, 3]);
checkListIterator(g);
// This is mostly undefined behavior.
Iterator it = g.iterator;
Expect.isTrue(it.moveNext());
Expect.equals(1, it.current);
Expect.isTrue(it.moveNext());
g[1] = 49;
// The iterator keeps the last value.
Expect.equals(2, it.current);
Expect.isTrue(it.moveNext());
g.removeLast();
// The iterator keeps the last value.
Expect.equals(3, it.current);
Expect.throws(it.moveNext, (e) => e is ConcurrentModificationError);
// No progress when throwing.
Expect.equals(3, it.current);
}
}
main() {
ListIteratorsTest.testMain();
}