| // 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. |
| |
| import 'dart:collection'; |
| import 'package:expect/expect.dart'; |
| |
| main() { |
| // Regression test for https://github.com/dart-lang/sdk/issues/36052. |
| // JS compilers shouldn't produce `undefined` when a Map/Set key is not found. |
| testMap({}); |
| testMap(Map.identity()); |
| testMap(LinkedHashMap( |
| equals: (x, y) => x == y, |
| hashCode: (x) => x.hashCode, |
| isValidKey: (_) => true)); |
| |
| testSet(Set()); |
| testSet(Set.identity()); |
| testSet(LinkedHashSet( |
| equals: (x, y) => x == y, |
| hashCode: (x) => x.hashCode, |
| isValidKey: (_) => true)); |
| } |
| |
| testMap(Map<Object, Object> map) { |
| var t = map.runtimeType.toString(); |
| var s = ' (length ${map.length})'; |
| checkUndefined('$t.[]$s', map['hi']); |
| checkUndefined('$t.putIfAbsent$s', map.putIfAbsent('hi', () {})); |
| checkUndefined('$t.remove$s', map.remove('hi')); |
| if (map.isEmpty) { |
| map['hello'] = 'there'; |
| testMap(map); |
| } |
| } |
| |
| testSet(Set<Object> set) { |
| var t = set.runtimeType.toString(); |
| var s = ' (length ${set.length})'; |
| checkUndefined('$t.lookup$s', set.lookup('hi')); |
| if (set.isEmpty) { |
| set.add('hello'); |
| testSet(set); |
| } |
| } |
| |
| /// Fails if [x] incorrectly uses the default argument instead of being `null` |
| /// (i.e. because `x` is undefined). |
| checkUndefined(String method, [Object x = 'error']) { |
| // TODO(jmesserly): this check is specific to implementation details of DDC's |
| // current calling conventions. These conventions may change. |
| // Ideally we'd have an `undefined` constant in "package:js" and use that |
| // here instead. |
| Expect.isNull(x, |
| 'error in $method: result treated as missing argument (JS undefined?)'); |
| } |