57 lines
1.5 KiB
JavaScript
57 lines
1.5 KiB
JavaScript
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// 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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// Flags: --harmony-proxies
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var target = {
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"target_one": 1
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};
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target.__proto__ = {
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"target_two": 2
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};
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var handler = {
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has: function(target, name) {
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return name == "present";
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}
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}
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var proxy = new Proxy(target, handler);
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// Test simple cases.
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assertTrue("present" in proxy);
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assertFalse("nonpresent" in proxy);
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// Test interesting algorithm steps:
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// Step 7: Fall through to target if trap is undefined.
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handler.has = undefined;
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assertTrue("target_one" in proxy);
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assertTrue("target_two" in proxy);
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assertFalse("in_your_dreams" in proxy);
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// Step 8: Result is converted to boolean.
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var result = 1;
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handler.has = function(t, n) { return result; }
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assertTrue("foo" in proxy);
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result = {};
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assertTrue("foo" in proxy);
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result = undefined;
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assertFalse("foo" in proxy);
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result = "string";
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assertTrue("foo" in proxy);
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// Step 9b i. Trap result must confirm presence of non-configurable properties
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// of the target.
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Object.defineProperty(target, "nonconf", {value: 1, configurable: false});
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result = false;
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assertThrows("'nonconf' in proxy", TypeError);
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// Step 9b iii. Trap result must confirm presence of all own properties of
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// non-extensible targets.
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Object.freeze(target);
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assertThrows("'nonconf' in proxy", TypeError);
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assertThrows("'target_one' in proxy", TypeError);
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assertFalse("target_two" in proxy);
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assertFalse("in_your_dreams" in proxy);
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