| // 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 spreading primitive strings. |
| |
| assertEquals([...''], []); |
| |
| var str = 'ott'; |
| assertEquals(['o', 't', 't'], [...str]); |
| assertTrue(%StringIteratorProtector()); |
| |
| str[Symbol.iterator] = {}; |
| // Symbol.iterator can't be set on primitive strings, so it shouldn't invalidate |
| // the protector. |
| assertTrue(%StringIteratorProtector()); |
| |
| // This changes the String Iterator prototype. No more tests should be run after |
| // this in the same instance. |
| var iterator = str[Symbol.iterator](); |
| iterator.__proto__.next = () => ({value : undefined, done : true}); |
| |
| assertFalse(%StringIteratorProtector()); |
| assertEquals([], [...str]); |
