mirror of
https://github.com/tc39/test262.git
synced 2025-11-04 05:33:50 +01:00
31 lines
936 B
JavaScript
31 lines
936 B
JavaScript
// Copyright 2018 the V8 project authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
// Flags: --allow-natives-syntax --no-stress-opt
|
|
|
|
// Tests for wrapped strings.
|
|
|
|
var str = new String('ott');
|
|
assertTrue(%StringIteratorProtector());
|
|
assertEquals(['o', 't', 't'], [...str]);
|
|
|
|
function iterator_fn() {
|
|
return {next : () => ({value : undefined, done : true})};
|
|
};
|
|
|
|
str[Symbol.iterator] = iterator_fn;
|
|
// This shouldn't invalidate the protector, because it doesn't support String
|
|
// objects.
|
|
assertTrue(%StringIteratorProtector());
|
|
assertEquals([], [...str]);
|
|
|
|
|
|
var str2 = new String('ott');
|
|
assertEquals(['o', 't', 't'], [...str2]);
|
|
// This changes the String prototype. No more tests should be run after this in
|
|
// the same instance.
|
|
str2.__proto__[Symbol.iterator] = iterator_fn;
|
|
assertFalse(%StringIteratorProtector());
|
|
assertEquals([], [...str2]);
|