mirror of
https://github.com/dart-lang/sdk
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3c6a431589
Change-Id: Id61ac90e028d8cb05ab0aba52ecd772644b4f773 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/145721 Reviewed-by: Lasse R.H. Nielsen <lrn@google.com> Commit-Queue: Riley Porter <rileyporter@google.com>
102 lines
3.2 KiB
Dart
102 lines
3.2 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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// Requirements=nnbd-strong
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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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testIterable();
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testList();
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testMap();
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testSet();
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}
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testIterable() {
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var iterable = new Iterable<C?>.generate(elements.length, (n) => elements[n]);
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// Downcast non-nullable.
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// An iterable that (likely) can do direct access.
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var dIterableDirect = Iterable.castFrom<C?, D>(iterable);
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Expect.equals(d, dIterableDirect.elementAt(1));
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// null is not D.
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Expect.throws(() => dIterableDirect.skip(3).elementAt(1));
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// An iterable that cannot do direct access.
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var dIterableNonDirect =
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Iterable.castFrom<C?, D>(iterable.where((_) => true));
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Expect.equals(d, dIterableNonDirect.elementAt(1));
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// null is not D.
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Expect.throws(() => dIterableNonDirect.skip(3).elementAt(1));
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// Iterable that definitely won't survive accessing element 3.
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var iterableLimited = new Iterable<C?>.generate(
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elements.length, (n) => n == 3 ? throw "untouchable" : elements[n]);
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var dIterableLimited = Iterable.castFrom<C?, D>(iterableLimited);
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Expect.equals(d, dIterableLimited.elementAt(1));
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// null is not D.
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Expect.throws(() => dIterableLimited.skip(3).elementAt(1));
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// Upcast non-nullable.
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var objectIterable = Iterable.castFrom<C?, Object>(iterable);
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// null is not Object.
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Expect.throws(() => objectIterable.skip(3).elementAt(1));
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}
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testList() {
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var list = new List<C?>.from(elements);
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// Downcast non-nullable.
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var dList = List.castFrom<C?, D>(list);
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Expect.equals(d, dList[1]);
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Expect.throws(() => dList.last); // null is not D.
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// Upcast non-nullable.
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var objectList = List.castFrom<C?, Object>(list);
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Expect.throws(() => objectList.last); // null is not Object.
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}
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testMap() {
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var map = new Map.fromIterables(elements, elements);
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// Downcast non-nullable.
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var dMap = Map.castFrom<C?, C?, D, D>(map);
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Expect.equals(d, dMap[d]);
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Expect.isTrue(dMap.containsKey(null));
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Expect.equals(null, dMap[null]);
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// Test keys and values
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Expect.isTrue(dMap.keys is Iterable<D>);
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Expect.isTrue(dMap.values is Iterable<D>);
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Expect.throws(() => dMap.keys.toList());
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Expect.throws(() => dMap.values.toList());
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// Upcast non-nullable.
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var objectMap = Map.castFrom<C?, C?, Object, Object>(map);
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Expect.isTrue(objectMap.containsKey(null));
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Expect.equals(null, objectMap[null]);
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// Test keys and values
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Expect.isTrue(objectMap.keys is Iterable<Object>);
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Expect.isTrue(objectMap.values is Iterable<Object>);
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// null is not Object.
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Expect.throws(() => objectMap.keys.toList());
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Expect.throws(() => objectMap.values.toList());
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}
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testSet() {
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var setEls = new Set<C?>.from(elements);
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// Downcast non-nullable.
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var dSet = Set.castFrom<C?, D>(setEls);
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Expect.equals(d, dSet.elementAt(1));
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Expect.throws(() => dSet.last); // null is not D.
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// Upcast non-nullable.
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var objectSet = Set.castFrom<C?, Object>(setEls);
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Expect.throws(() => objectSet.last); // null is not Object.
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}
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