test/Bugs/deletenonconfig.js

//-------------------------------------------------------------------------------------------------------
// Copyright (C) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
//-------------------------------------------------------------------------------------------------------

WScript.LoadScriptFile("..\\UnitTestFramework\\UnitTestFramework.js");

function makeProperty(obj, prop) {
    Object.defineProperty(obj, prop, {
        configurable: false,
        writable: true,
        value: 'basic'
    });
}

var tests = [
    {
        name: "Delete non-configurable property on Array.prototype.copyWithin",
        body: function () {
            var obj = { length: 4 };
            makeProperty(obj, '3');
            assert.throws(() => Array.prototype.copyWithin.call(obj, 3, 0), TypeError, "copyWithin is trying to delete the non-configurable property", "Cannot delete non-configurable property '3'");
        }
    },
    {
        name: "Delete non-configurable indexed property of TypedArray on Array.prototype.copyWithin",
        body: function () {
            var ta = Int8Array.of(0, 1, 2);
            // Array's implementation of copyWithin uses 'length' property to determine the source items
            // to copy and it would attempt to delete the target items if the source items are missing,
            // which is not supported by TypedArrays.
            Object.defineProperty(ta, "length", { value: 4 });
            assert.throws(() => Array.prototype.copyWithin.call(ta, 1, 2), TypeError, "copyWithin is trying to delete the non-configurable indexed property", "Cannot delete non-configurable property '2'");
        }
    },
    {
        name: "Delete non-configurable property on Array.prototype.pop",
        body: function () {
            var obj = { length: 4 };
            makeProperty(obj, '3');
            assert.throws(() => Array.prototype.pop.call(obj), TypeError, "pop is trying to delete the non-configurable property", "Cannot delete non-configurable property '3'");
        }
    },
    {
        name: "Delete non-configurable property on Array.prototype.shift",
        body: function () {
            var obj = { length: 4 };
            makeProperty(obj, '3');
            assert.throws(() => Array.prototype.shift.call(obj), TypeError, "shift is trying to delete the non-configurable property", "Cannot delete non-configurable property '3'");
        }
    },
    {
        name: "Delete non-configurable property on Array.prototype.reverse",
        body: function () {
            var obj = { length: 4 };
            makeProperty(obj, '3');
            assert.throws(() => Array.prototype.reverse.call(obj), TypeError, "reverse is trying to delete the non-configurable property", "Cannot delete non-configurable property '3'");
        }
    },

];

testRunner.runTests(tests, { verbose: WScript.Arguments[0] != "summary" });