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654b725ee4
Also splits up cast_test to test collections separately and updates corelib_2 version with the same changes, including fixes in relevant pending CL: https://dart-review.googlesource.com/c/sdk/+/126320 Fixes #39517 Bug: http://dartbug.com/39517 Change-Id: I8df1fde1d48ed23561ce9d0d8b87d7fc2ba52eb1 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/144469 Commit-Queue: Riley Porter <rileyporter@google.com> Reviewed-by: Lasse R.H. Nielsen <lrn@google.com> Reviewed-by: Bob Nystrom <rnystrom@google.com>
47 lines
1.2 KiB
Dart
47 lines
1.2 KiB
Dart
// Copyright (c) 2020, 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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import "dart:collection";
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import "package:expect/expect.dart";
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import 'cast_helper.dart';
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void main() {
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testDowncast();
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testUpcast();
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testRegression();
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}
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void testDowncast() {
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var list = new List<C?>.from(elements);
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var dList = List.castFrom<C?, D?>(list);
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Expect.throws(() => dList.first); // C is not D?.
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Expect.equals(d, dList[1]);
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Expect.throws(() => dList[2]); // E is not D?.
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Expect.equals(f, dList[3]);
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Expect.equals(null, dList.last);
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Expect.throws(() => dList.toList());
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// Setting works.
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dList[2] = d;
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Expect.equals(d, dList[2]);
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}
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void testUpcast() {
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var list = new List<C?>.from(elements);
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var objectList = List.castFrom<C?, Object?>(list);
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Expect.listEquals(elements, objectList);
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Expect.throws(() => objectList[2] = new Object()); // Cannot set non-C.
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Expect.listEquals(elements, objectList);
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}
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void testRegression() {
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var numList = <num>[4, 3, 2, 1];
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var intList = numList.cast<int>();
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intList.sort(null);
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Expect.listEquals([1, 2, 3, 4], numList);
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Expect.listEquals([1, 2, 3, 4], intList);
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}
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