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b101a7d002
Change-Id: Ib33169c3e0ffc870915c189404074a1dea472546 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/196548 Reviewed-by: Bob Nystrom <rnystrom@google.com> Commit-Queue: Leaf Petersen <leafp@google.com>
65 lines
2 KiB
Dart
65 lines
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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// @dart = 2.9
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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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}
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void testDowncast() {
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var map = new Map.fromIterables(elements, elements);
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var dMap = Map.castFrom<C, C, D, D>(map);
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Expect.isTrue(dMap is Map<D, D>);
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Expect.equals(null, dMap[new C()]);
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Expect.throws(() => dMap[c]); // C is not D.
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Expect.isTrue(dMap.containsKey(c)); // containsKey should not be typed.
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Expect.equals(d, dMap[d]);
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Expect.throws(() => dMap[e]); // E is not D.
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Expect.isTrue(dMap.containsKey(null));
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Expect.equals(null, dMap[null]);
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Expect.equals(5, dMap.length);
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Expect.throws(() => dMap.remove(c)); // Removes key but fails to return value.
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Expect.equals(4, dMap.length);
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Expect.equals(null, dMap[c]);
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// Runtime errors when assigning or accessing a C.
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Expect.throws(() => dMap[c] = d);
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Expect.throws(() => dMap[d] = c);
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Expect.equals(4, dMap.length);
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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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}
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void testUpcast() {
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var map = new Map.fromIterables(elements, elements);
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var objectMap = Map.castFrom<C, C, Object, Object>(map);
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Expect.equals(5, objectMap.length);
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Expect.equals(c, objectMap[c]);
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Expect.isTrue(objectMap.containsKey(c));
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Expect.equals(c, objectMap.remove(c));
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Expect.equals(4, objectMap.length);
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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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var expected = new List<Object>.from(elements);
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expected.remove(c);
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Expect.listEquals(expected, objectMap.keys.toList());
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Expect.listEquals(expected, objectMap.values.toList());
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}
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