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sourceRevisionAtLastExport: 33f2fb0e53d135f0ee17cfccd9d993eb2a6f47de targetRevisionAtLastExport: 31340cbd9add103f586d501b0c3354b7b182abc0
83 lines
3.1 KiB
JavaScript
83 lines
3.1 KiB
JavaScript
// Copyright 2015 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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// Check basic call to trap.
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var g_target, g_name, g_desc;
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var handler = {
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defineProperty: function(target, name, desc) {
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g_target = target;
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g_name = name;
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g_desc = desc;
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return true;
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}
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}
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var target = {}
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var proxy = new Proxy(target, handler);
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var desc = { value: 1, writable: true, configurable: true, enumerable: true };
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Object.defineProperty(proxy, "foo", desc);
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assertSame(target, g_target);
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assertEquals("foo", g_name);
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assertEquals(desc, g_desc);
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// Check specific steps in the spec
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// Step 4: revoked handler
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var pair = Proxy.revocable(target, handler);
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Object.defineProperty(proxy, "foo2", desc);
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assertSame(target, g_target);
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assertEquals("foo2", g_name);
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assertEquals(desc, g_desc);
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pair.revoke();
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assertThrows('Object.defineProperty(pair.proxy, "bar", desc);', TypeError);
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// Step 6: Trap isn't callable.
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handler.defineProperty = 1;
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assertThrows("Object.defineProperty(proxy, 'foo', {value: 2})", TypeError);
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// Step 7: Trap is undefined.
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handler.defineProperty = undefined;
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Object.defineProperty(proxy, "prop1", desc);
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assertEquals(desc, Object.getOwnPropertyDescriptor(target, "prop1"));
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var target2 = {};
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var proxy2 = new Proxy(target2, {});
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Object.defineProperty(proxy2, "prop2", desc);
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assertEquals(desc, Object.getOwnPropertyDescriptor(target2, "prop2"));
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// Step 9: Property name is passed to the trap as a string.
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handler.defineProperty = function(t, name, d) { g_name = name; return true; };
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Object.defineProperty(proxy, 0, desc);
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assertTrue(typeof g_name === "string");
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assertEquals("0", g_name);
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// Step 10: Trap returns false.
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handler.defineProperty = function(t, n, d) { return false; }
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assertThrows("Object.defineProperty(proxy, 'foo', desc)", TypeError);
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// Step 15a: Trap returns true for adding a property to a non-extensible target.
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handler.defineProperty = function(t, n, d) { return true; }
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Object.preventExtensions(target);
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assertThrows("Object.defineProperty(proxy, 'foo', desc)", TypeError);
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// Step 15b: Trap returns true for adding a non-configurable property.
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target = {};
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proxy = new Proxy(target, handler);
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desc = {value: 1, writable: true, configurable: false, enumerable: true};
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assertThrows("Object.defineProperty(proxy, 'foo', desc)", TypeError);
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// No exception is thrown if a non-configurable property exists on the target.
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Object.defineProperty(target, "nonconf",
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{value: 1, writable: true, configurable: false});
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Object.defineProperty(proxy, "nonconf", {value: 2, configurable: false});
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// Step 16a: Trap returns true for non-compatible property descriptor.
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Object.defineProperty(target, "foo",
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{value: 1, writable: false, configurable: false});
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assertThrows("Object.defineProperty(proxy, 'foo', {value: 2})", TypeError);
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// Step 16b: Trap returns true for overwriting a configurable property
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// with a non-configurable descriptor.
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target.bar = "baz";
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assertThrows("Object.defineProperty(proxy, 'bar', {configurable: false})",
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TypeError);
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