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https://github.com/dart-lang/sdk
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b101a7d002
Change-Id: Ib33169c3e0ffc870915c189404074a1dea472546 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/196548 Reviewed-by: Bob Nystrom <rnystrom@google.com> Commit-Queue: Leaf Petersen <leafp@google.com>
60 lines
1.8 KiB
Dart
60 lines
1.8 KiB
Dart
// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// @dart = 2.9
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import 'dart:collection';
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import 'package:expect/expect.dart';
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main() {
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// Regression test for https://github.com/dart-lang/sdk/issues/36052.
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// JS compilers shouldn't produce `undefined` when a Map/Set key is not found.
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testMap({});
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testMap(Map.identity());
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testMap(LinkedHashMap(
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equals: (x, y) => x == y,
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hashCode: (x) => x.hashCode,
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isValidKey: (_) => true));
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testSet(Set());
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testSet(Set.identity());
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testSet(LinkedHashSet(
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equals: (x, y) => x == y,
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hashCode: (x) => x.hashCode,
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isValidKey: (_) => true));
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}
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testMap(Map<Object, Object> map) {
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var t = map.runtimeType.toString();
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var s = ' (length ${map.length})';
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checkUndefined('$t.[]$s', map['hi']);
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checkUndefined('$t.putIfAbsent$s', map.putIfAbsent('hi', () {}));
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checkUndefined('$t.remove$s', map.remove('hi'));
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if (map.isEmpty) {
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map['hello'] = 'there';
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testMap(map);
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}
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}
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testSet(Set<Object> set) {
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var t = set.runtimeType.toString();
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var s = ' (length ${set.length})';
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checkUndefined('$t.lookup$s', set.lookup('hi'));
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if (set.isEmpty) {
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set.add('hello');
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testSet(set);
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}
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}
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/// Fails if [x] incorrectly uses the default argument instead of being `null`
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/// (i.e. because `x` is undefined).
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checkUndefined(String method, [Object x = 'error']) {
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// TODO(jmesserly): this check is specific to implementation details of DDC's
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// current calling conventions. These conventions may change.
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// Ideally we'd have an `undefined` constant in "package:js" and use that
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// here instead.
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Expect.isNull(x,
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'error in $method: result treated as missing argument (JS undefined?)');
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}
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