| // Copyright 2015 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| var target = { |
| "target_one": 1 |
| }; |
| target.__proto__ = { |
| "target_two": 2 |
| }; |
| var handler = { |
| has: function(target, name) { |
| return name == "present"; |
| } |
| } |
| |
| var proxy = new Proxy(target, handler); |
| |
| // Test simple cases. |
| assertTrue("present" in proxy); |
| assertFalse("nonpresent" in proxy); |
| |
| // Test interesting algorithm steps: |
| |
| // Step 7: Fall through to target if trap is undefined. |
| handler.has = undefined; |
| assertTrue("target_one" in proxy); |
| assertTrue("target_two" in proxy); |
| assertFalse("in_your_dreams" in proxy); |
| |
| // Step 8: Result is converted to boolean. |
| var result = 1; |
| handler.has = function(t, n) { return result; } |
| assertTrue("foo" in proxy); |
| result = {}; |
| assertTrue("foo" in proxy); |
| result = undefined; |
| assertFalse("foo" in proxy); |
| result = "string"; |
| assertTrue("foo" in proxy); |
| |
| // Step 9b i. Trap result must confirm presence of non-configurable properties |
| // of the target. |
| Object.defineProperty(target, "nonconf", {value: 1, configurable: false}); |
| result = false; |
| assertThrows("'nonconf' in proxy", TypeError); |
| |
| // Step 9b iii. Trap result must confirm presence of all own properties of |
| // non-extensible targets. |
| Object.preventExtensions(target); |
| assertThrows("'nonconf' in proxy", TypeError); |
| assertThrows("'target_one' in proxy", TypeError); |
| assertFalse("target_two" in proxy); |
| assertFalse("in_your_dreams" in proxy); |
| |
| // Regression test for crbug.com/570120 (stray JSObject::cast). |
| (function TestHasPropertyFastPath() { |
| var proxy = new Proxy({}, {}); |
| var object = Object.create(proxy); |
| object.hasOwnProperty(0); |
| })(); |