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// Copyright (c) 2017, 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.
/// @assertion Set<E> toSet()
/// The set may contain fewer elements than the iterable, if the iterable
/// contains an element more than once, or it contains one or more elements that
/// are equal. The order of the elements in the set is not guaranteed to be the
/// same as for the iterable.
/// @description Checks that proper Set is created.
/// @author
import "dart:collection";
import "../../../Utils/expect.dart";
class MyIterable<int> extends Object with IterableMixin {
List _content;
MyIterable(List list): _content = list;
Iterator get iterator {
return _content.iterator;
void checkEquals(Iterable expected, Set actual) {
Set set0 = new Set();
for (var el in expected) {
main() {
IterableMixin iterable = new MyIterable([]);
Set res = iterable.toSet();
Expect.equals(0, res.length);
iterable = new MyIterable([1, "2", "3", "4", "5", "4", 1]);
res = iterable.toSet();
checkEquals(iterable, res);
iterable = new MyIterable([null, [null], [], [1,2,3], [[null]]]);
res = iterable.toSet();
checkEquals(iterable, res);