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31 lines
936 B
JavaScript
31 lines
936 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 wrapped strings.
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var str = new String('ott');
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assertTrue(%StringIteratorProtector());
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assertEquals(['o', 't', 't'], [...str]);
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function iterator_fn() {
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return {next : () => ({value : undefined, done : true})};
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};
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str[Symbol.iterator] = iterator_fn;
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// This shouldn't invalidate the protector, because it doesn't support String
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// objects.
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assertTrue(%StringIteratorProtector());
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assertEquals([], [...str]);
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var str2 = new String('ott');
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assertEquals(['o', 't', 't'], [...str2]);
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// This changes the String prototype. No more tests should be run after this in
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// the same instance.
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str2.__proto__[Symbol.iterator] = iterator_fn;
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assertFalse(%StringIteratorProtector());
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assertEquals([], [...str2]);
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