pop-nonwritable-length-denseinitializedlength-below-length.js

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load(libdir + "asserts.js");

function f(arr)

  assertEq(arr.pop(), undefined); // if it doesn't throw

var N = 100;

function basic(out)

  // Create an array of arrays, to be iterated over for [].pop-calling.  We

  // can't just loop on pop on a single array with non-writable length because

  // pop throws when called on an array with non-writable length.

  var arrs = out.arrs = [];

  for (var i = 0; i < N; i++)

    var arr = [0, 1, 2, 3, 4];

    arr.length = 6;

    arrs.push(arr);

  var a = [0, 1, 2, 3, 4];

  Object.defineProperty(a, "length", { writable: false, value: 6 });

  arrs.push(a);

  for (var i = 0, sz = arrs.length; i < sz; i++)

    f(arrs[i]);

var obj = {};

var arrs, a;

assertThrowsInstanceOf(function() { basic(obj); }, TypeError);

var arrs = obj.arrs;

assertEq(arrs.length, N + 1);

for (var i = 0; i < N; i++)

  assertEq(arrs[i].length, 5, "unexpected length for arrs[" + i + "]");

  assertEq(arrs[i].hasOwnProperty(5), false,

           "element not deleted for arrs[" + i + "]");

var a = arrs[N];

assertEq(a.hasOwnProperty(5), false);

assertEq(a[5], undefined);

assertEq(a.length, 6);