69 lines
1.4 KiB
JavaScript
69 lines
1.4 KiB
JavaScript
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// Copyright 2014 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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//
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// Flags: --harmony-classes --allow-natives-syntax
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'use strict';
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(function TestMaps() {
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class Base {}
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class Derived extends Base {}
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let d1 = new Derived();
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let d2 = new Derived();
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assertTrue(%HaveSameMap(d1, d2));
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}());
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(function TestProtoModificationArray() {
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let called = 0;
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function F() {
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called++;
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assertFalse(Array.isArray(this));
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}
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class Derived extends Array {}
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assertSame(Derived.__proto__, Array);
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let d1 = new Derived();
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assertTrue(Array.isArray(d1));
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Derived.__proto__ = F;
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called = 0;
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let d2 = new Derived();
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assertSame(1, called);
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assertFalse(Array.isArray(d2));
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assertFalse(%HaveSameMap(d1, d2));
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}());
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(function TestProtoModification() {
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let called = 0;
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function F() {
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called++;
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let exn = null;
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try {
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this.byteLength;
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} catch (e) {
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exn = e;
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}
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assertTrue(exn instanceof TypeError);
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}
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class Derived extends Uint8Array {
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constructor() { super(10); }
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}
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assertSame(Derived.__proto__, Uint8Array);
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let d1 = new Derived();
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assertSame(10, d1.byteLength);
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Derived.__proto__ = F;
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called = 0;
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let d2 = new Derived();
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assertSame(1, called);
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assertThrows(function() { d2.byteLength; }, TypeError);
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assertFalse(%HaveSameMap(d1, d2));
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}());
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