The Tor Browser: js/src/tests/ecma_5/Array/length-truncate-nonconfigurable.js@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /*

     2  * Any copyright is dedicated to the Public Domain.

     3  * http://creativecommons.org/licenses/publicdomain/

     4  * Contributor:

     5  *   Jeff Walden <jwalden+code@mit.edu>

     6  */

     8 //-----------------------------------------------------------------------------

     9 var BUGNUMBER = 858381;

    10 var summary =

    11   "Array length redefinition behavior with non-configurable elements";

    13 print(BUGNUMBER + ": " + summary);

    15 /**************

    16  * BEGIN TEST *

    17  **************/

    19 var arr = [0, 1, 2];

    20 Object.defineProperty(arr, 1, { configurable: false });

    22 try

    23 {

    24   Object.defineProperty(arr, "length", { value: 0, writable: false });

    25 }

    26 catch (e)

    27 {

    28   assertEq(e instanceof TypeError, true,

    29            "must throw TypeError when array truncation would have to remove " +

    30            "non-configurable elements");

    31 }

    33 assertEq(arr.length, 2, "length is highest remaining index plus one");

    35 var desc = Object.getOwnPropertyDescriptor(arr, "length");

    36 assertEq(desc !== undefined, true);

    38 assertEq(desc.value, 2);

    39 assertEq(desc.writable, false);

    40 assertEq(desc.enumerable, false);

    41 assertEq(desc.configurable, false);

    43 /******************************************************************************/

    45 if (typeof reportCompare === "function")

    46   reportCompare(true, true);

    48 print("Tests complete");

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