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TEST=ci Bug: Contributes to https://github.com/dart-lang/sdk/issues/49529 Change-Id: Ic129ef2d89f625d9ec6a7a1c301cffddd60b2ff7 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/258920 Reviewed-by: Lasse Nielsen <lrn@google.com> Commit-Queue: Michael Thomsen <mit@google.com> Reviewed-by: Slava Egorov <vegorov@google.com>
53 lines
1.4 KiB
Dart
53 lines
1.4 KiB
Dart
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// @dart = 2.9
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import "package:expect/expect.dart";
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class ListIteratorsTest {
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static void checkListIterator(List a) {
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Iterator it = a.iterator;
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Expect.isNull(it.current);
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for (int i = 0; i < a.length; i++) {
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Expect.isTrue(it.moveNext());
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var elem = it.current;
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Expect.equals(a[i], elem);
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}
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Expect.isFalse(it.moveNext());
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Expect.isNull(it.current);
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}
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static testMain() {
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checkListIterator([]);
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checkListIterator([1, 2]);
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checkListIterator(new List.filled(0, null));
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checkListIterator(new List.filled(10, null));
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checkListIterator([]);
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List g = [];
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g.addAll([1, 2, 3]);
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checkListIterator(g);
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// This is mostly undefined behavior.
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Iterator it = g.iterator;
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Expect.isTrue(it.moveNext());
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Expect.equals(1, it.current);
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Expect.isTrue(it.moveNext());
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g[1] = 49;
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// The iterator keeps the last value.
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Expect.equals(2, it.current);
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Expect.isTrue(it.moveNext());
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g.removeLast();
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// The iterator keeps the last value.
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Expect.equals(3, it.current);
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Expect.throws(it.moveNext, (e) => e is ConcurrentModificationError);
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// No progress when throwing.
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Expect.equals(3, it.current);
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}
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}
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main() {
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ListIteratorsTest.testMain();
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}
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