| // Copyright (c) 2020, 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 "dart:collection"; |
| import "package:expect/expect.dart"; |
| import 'cast_helper.dart'; |
| |
| void main() { |
| testOrder(); |
| testDowncast(); |
| testUpcast(); |
| testNewSet(); |
| } |
| |
| void testOrder() { |
| var setEls = new Set<C>.from(elements); // Linked HashSet. |
| Expect.listEquals(elements, setEls.toList()); // Preserves order. |
| } |
| |
| void testDowncast() { |
| var setEls = new Set<C>.from(elements); |
| var dSet = Set.castFrom<C, D>(setEls); |
| |
| // Preserves order. |
| Expect.throws(() => dSet.first); // C is not D. |
| Expect.equals(d, dSet.elementAt(1)); |
| Expect.throws(() => dSet.elementAt(2)); // E is not D. |
| Expect.equals(f, dSet.elementAt(3)); |
| Expect.equals(null, dSet.elementAt(4)); |
| |
| Expect.throws(() => dSet.toList()); |
| |
| // Contains should not be typed. |
| var newC = new C(); |
| Expect.isFalse(dSet.contains(newC)); |
| Expect.throws(() => dSet.add(newC)); |
| Expect.isFalse(dSet.contains(newC)); |
| Expect.isTrue(dSet.contains(c)); |
| |
| // Remove and length should not be typed. |
| Expect.equals(5, dSet.length); |
| dSet.remove(c); // Success, no type checks. |
| Expect.equals(4, dSet.length); |
| } |
| |
| void testUpcast() { |
| var setEls = new Set<C>.from(elements); |
| var objectSet = Set.castFrom<C, Object>(setEls); |
| |
| Expect.listEquals(elements, objectSet.toList()); |
| |
| var newObject = new Object(); |
| Expect.throws(() => objectSet.add(newObject)); |
| Expect.isFalse(objectSet.contains(newObject)); |
| |
| var toSet = objectSet.toSet(); |
| Expect.isTrue(toSet is LinkedHashSet<Object>); |
| Expect.isFalse(toSet is LinkedHashSet<C>); |
| } |
| |
| void testNewSet() { |
| // Specified custom newSet as empty HashSet. |
| var setEls = new Set<C>.from(elements); |
| var customNewSet; |
| var objectSet2 = Set.castFrom<C, Object>(setEls, |
| newSet: <T>() => customNewSet = new HashSet<T>()); |
| |
| var customToSet = objectSet2.toSet(); |
| Expect.isTrue(customToSet is HashSet<Object>); |
| Expect.isFalse(customToSet is HashSet<C>); |
| Expect.identical(customToSet, customNewSet); |
| } |