mirror of
https://github.com/tc39/test262.git
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7298a38552
sourceRevisionAtLastExport: 33f2fb0e53d135f0ee17cfccd9d993eb2a6f47de targetRevisionAtLastExport: 31340cbd9add103f586d501b0c3354b7b182abc0
77 lines
3.0 KiB
JavaScript
77 lines
3.0 KiB
JavaScript
// Copyright 2016 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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let get = () => {};
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let set = () => {};
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let target = {};
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let handler = {
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getOwnPropertyDescriptor(target, prop) {
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let configurable = true;
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if (prop == "both") {
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return { get, set, configurable };
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} else if (prop == "get") {
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return { get, configurable };
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} else if (prop == "set") {
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return { set, configurable };
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} else if (prop == "data") {
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return { value: 42, configurable };
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} else {
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return Reflect.getOwnPropertyDescriptor(target, prop);
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}
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}
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};
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// Test behavior on own properties.
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let proxy = new Proxy(target, handler);
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assertSame(get, proxy.__lookupGetter__("both"));
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assertSame(get, proxy.__lookupGetter__("get"));
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assertSame(undefined, proxy.__lookupGetter__("set"));
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assertSame(undefined, proxy.__lookupGetter__("data"));
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assertSame(set, proxy.__lookupSetter__("both"));
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assertSame(undefined, proxy.__lookupSetter__("get"));
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assertSame(set, proxy.__lookupSetter__("set"));
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assertSame(undefined, proxy.__lookupSetter__("data"));
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// Test behavior on the prototype chain.
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let object = { __proto__: proxy };
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assertSame(get, object.__lookupGetter__("both"));
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assertSame(get, object.__lookupGetter__("get"));
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assertSame(undefined, object.__lookupGetter__("set"));
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assertSame(undefined, object.__lookupGetter__("data"));
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assertSame(set, object.__lookupSetter__("both"));
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assertSame(undefined, object.__lookupSetter__("get"));
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assertSame(set, object.__lookupSetter__("set"));
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assertSame(undefined, object.__lookupSetter__("data"));
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// Test being shadowed while on prototype chain.
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let shadower = { __proto__: proxy, both: 1, get: 2, set: 3, data: 4 };
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assertSame(undefined, shadower.__lookupGetter__("both"));
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assertSame(undefined, shadower.__lookupGetter__("get"));
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assertSame(undefined, shadower.__lookupGetter__("set"));
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assertSame(undefined, shadower.__lookupGetter__("data"));
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assertSame(undefined, shadower.__lookupSetter__("both"));
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assertSame(undefined, shadower.__lookupSetter__("get"));
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assertSame(undefined, shadower.__lookupSetter__("set"));
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assertSame(undefined, shadower.__lookupSetter__("data"));
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// Test getPrototypeOf trap.
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let getFoo = () => {};
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let setFoo = () => {};
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let proto = {};
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Reflect.defineProperty(proto, "foo", { get: getFoo, set: setFoo });
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Reflect.setPrototypeOf(target, proto);
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assertSame(getFoo, proxy.__lookupGetter__("foo"));
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assertSame(setFoo, proxy.__lookupSetter__("foo"));
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handler.getPrototypeOf = () => null;
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assertSame(undefined, proxy.__lookupGetter__("foo"));
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assertSame(undefined, proxy.__lookupSetter__("foo"));
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handler.getPrototypeOf = () => proto;
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assertSame(getFoo, proxy.__lookupGetter__("foo"));
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assertSame(setFoo, proxy.__lookupSetter__("foo"));
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// Test shadowing the prototype.
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Reflect.defineProperty(proto, "data", { get: getFoo, set: setFoo });
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assertSame(undefined, proxy.__lookupGetter__("data"));
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assertSame(undefined, proxy.__lookupSetter__("data"));
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