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 // Copyright (c) 2019, 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 An expression like: /// { ...a, ...b } /// Is syntactically parsed as [mapOrSetLiteral]. To determine whether it /// actually is a map or set, the surrounding context is used. Given an /// [mapOrSetLiteral] with context type [C]: /// /// If [Set] is assignable to [C], and [Map] is not /// assignable to [C], then the collection is a set literal. /// /// Otherwise, it is a map literal. /// /// In other words, if it can only be a set, it is. Otherwise, it's a map. /// @description Checks that if [a] and [b] are set literals (probably, /// null-aware), their spread is a set. /// @author iarkh@unipro.ru import "../../Utils/expect.dart"; import "dart:collection"; class MyIterable extends IterableBase { MyIterable(); Iterator get iterator => MyIterator(); } class MyIterator extends Iterator { int i = -1; MyIterator() {} @override bool moveNext() { return ++i < 10; } @override dynamic get current { return i; } } Set? getASet() => {1, 2, 3}; List? getAList() => [0, 2, 4, 6, 8]; Iterable? getIterable() => MyIterable(); main() { Set set1 = {1, 2, 3}; List list1 = [0, 2, 4, 6, 8]; var map = null; List? list2 = null; Iterable i = MyIterable(); Set res1 = {...set1, ...?list2}; Expect.setEquals(set1, res1); Set res2 = {...?list2, ...list1}; Expect.setEquals(list1.toSet(), res2); Set res3 = {...?map, ...list1}; Expect.setEquals(list1.toSet(), res3); Set res4 = {...?list2, ...?getIterable()}; Expect.setEquals(i.toSet(), res4); Set res5 = {...i, ...?map}; Expect.setEquals(i.toSet(), res5); Set res6 = {...set1, ...list1, ...?list2, ...?map, ...i}; Expect.setEquals({1, 2, 3, 0, 4, 6, 8, 5, 7, 9}, res6); Set res7 = {...?getASet(), ...?getAList(), ...?list2, ...?map, ...?getIterable()}; Expect.setEquals({1, 2, 3, 0, 4, 6, 8, 5, 7, 9}, res7); }