test/built-ins/Proxy/deleteProperty/trap-is-undefined-strict.js


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// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 9.5.10
description: >
    [[Delete]] (P)

    8. If trap is undefined, then Return target.[[Delete]](P).
flags: [onlyStrict]
features: [Reflect]
---*/

var target = {
    attr: 1
};
var p = new Proxy(target, {});

assert.sameValue(delete p.attr, true);
assert.sameValue(delete p.notThere, true);
assert.sameValue(
    Object.getOwnPropertyDescriptor(target, "attr"),
    undefined
);

Object.defineProperty(target, "attr", {
    configurable: false,
    enumerable: true,
    value: 1
});

assert.sameValue(Reflect.deleteProperty(p, "attr"), false);