unshift-01.js - mozsearch

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/*

 * Any copyright is dedicated to the Public Domain.

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

*/

//-----------------------------------------------------------------------------

var BUGNUMBER = 614070;

var summary = 'Array.prototype.unshift without args';

print(BUGNUMBER + ": " + summary);

/**************

 * BEGIN TEST *

 **************/

// ES6 ToLength clamps length values to 2^53 - 1.

var MAX_LENGTH = 2**53 - 1;

var a = {};

a.length = MAX_LENGTH + 1;

assertEq([].unshift.call(a), MAX_LENGTH);

assertEq(a.length, MAX_LENGTH);

function testGetSet(len, expected) {

    var newlen;

    var a = { get length() { return len; }, set length(v) { newlen = v; } };

    var res = [].unshift.call(a);

    assertEq(res, expected);

    assertEq(newlen, expected);

testGetSet(0, 0);

testGetSet(10, 10);

testGetSet("1", 1);

testGetSet(null, 0);

testGetSet(MAX_LENGTH + 2, MAX_LENGTH);

testGetSet(-5, 0);

/******************************************************************************/

if (typeof reportCompare === "function")

  reportCompare(true, true);

print("All tests passed!");