blob: d33ccd736946ff41171b31b8dd073e0b852d54e3 [file] [log] [blame]
// 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.
import "dart:collection";
import "package:expect/expect.dart";
import 'cast_helper.dart';
void main() {
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();
// 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));
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);