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41 lines
1.6 KiB
JavaScript
41 lines
1.6 KiB
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
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function toString(o) {
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%ToFastProperties(o.__proto__);
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return Object.prototype.toString.call(o);
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}
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class TestNumber extends Number {}
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TestNumber.prototype[Symbol.toStringTag] = "TestNumber";
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assertEquals("[object TestNumber]", toString(new TestNumber), "Try #1");
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assertEquals("[object TestNumber]", toString(new TestNumber), "Try #2");
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class TestBoolean extends Boolean {}
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TestBoolean.prototype[Symbol.toStringTag] = "TestBoolean";
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assertEquals("[object TestBoolean]", toString(new TestBoolean), "Try #1");
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assertEquals("[object TestBoolean]", toString(new TestBoolean), "Try #2");
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class TestString extends String {}
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TestString.prototype[Symbol.toStringTag] = "TestString";
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assertEquals("[object TestString]", toString(new TestString), "Try #1");
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assertEquals("[object TestString]", toString(new TestString), "Try #2");
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class base {}
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class TestBigInt extends base {}
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TestBigInt.prototype[Symbol.toStringTag] = 'TestBigInt';
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var b = new TestBigInt();
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b.__proto__.__proto__ = BigInt.prototype;
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assertEquals("[object TestBigInt]", toString(b), "Try #1");
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assertEquals("[object TestBigInt]", toString(b), "Try #2");
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class TestSymbol extends base {}
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TestSymbol.prototype[Symbol.toStringTag] = 'TestSymbol';
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var sym = new TestSymbol();
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sym.__proto__.__proto__ = Symbol.prototype;
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assertEquals("[object TestSymbol]", toString(sym), "Try #1");
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assertEquals("[object TestSymbol]", toString(sym), "Try #2");
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