The Tor Browser: js/src/tests/ecma_5/Array/redefine-nonwritable-length-custom-conversion-throw.js@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     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 = 866700;

    10 var summary = "Assertion redefining non-writable length to a non-numeric value";

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

    14 /**************

    15  * BEGIN TEST *

    16  **************/

    18 var count = 0;

    20 var convertible =

    21   {

    22     valueOf: function()

    23     {

    24       count++;

    25       if (count > 2)

    26         return 0;

    27       throw new SyntaxError("fnord");

    28     }

    29   };

    31 var arr = [];

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

    34 try

    35 {

    36   Object.defineProperty(arr, "length",

    37                         {

    38                           value: convertible,

    39                           writable: true,

    40                           configurable: true,

    41                           enumerable: true

    42                         });

    43   throw new Error("didn't throw");

    44 }

    45 catch (e)

    46 {

    47   assertEq(e instanceof SyntaxError, true, "expected SyntaxError, got " + e);

    48 }

    50 assertEq(count, 1);

    51 assertEq(arr.length, 0);

    53 /******************************************************************************/

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

    56   reportCompare(true, true);

    58 print("Tests complete");

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