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27 lines
843 B
JavaScript
27 lines
843 B
JavaScript
// Copyright 2018 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --allow-natives-syntax --no-stress-opt
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// Tests for spreading primitive strings.
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assertEquals([...''], []);
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var str = 'ott';
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assertEquals(['o', 't', 't'], [...str]);
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assertTrue(%StringIteratorProtector());
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str[Symbol.iterator] = {};
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// Symbol.iterator can't be set on primitive strings, so it shouldn't invalidate
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// the protector.
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assertTrue(%StringIteratorProtector());
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// This changes the String Iterator prototype. No more tests should be run after
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// this in the same instance.
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var iterator = str[Symbol.iterator]();
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iterator.__proto__.next = () => ({value : undefined, done : true});
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assertFalse(%StringIteratorProtector());
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assertEquals([], [...str]);
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