michael@0: load(libdir + "asserts.js");
michael@0: 
michael@0: function f(arr)
michael@0: {
michael@0:   assertEq(arr.pop(), undefined); // if it doesn't throw
michael@0: }
michael@0: 
michael@0: var N = 100;
michael@0: 
michael@0: function basic(out)
michael@0: {
michael@0:   // Create an array of arrays, to be iterated over for [].pop-calling.  We
michael@0:   // can't just loop on pop on a single array with non-writable length because
michael@0:   // pop throws when called on an array with non-writable length.
michael@0:   var arrs = out.arrs = [];
michael@0:   for (var i = 0; i < N; i++)
michael@0:   {
michael@0:     var arr = [0, 1, 2, 3, 4];
michael@0:     arr.length = 6;
michael@0:     arrs.push(arr);
michael@0:   }
michael@0: 
michael@0:   var a = [0, 1, 2, 3, 4];
michael@0:   Object.defineProperty(a, "length", { writable: false, value: 6 });
michael@0: 
michael@0:   arrs.push(a);
michael@0: 
michael@0:   for (var i = 0, sz = arrs.length; i < sz; i++)
michael@0:     f(arrs[i]);
michael@0: }
michael@0: 
michael@0: var obj = {};
michael@0: var arrs, a;
michael@0: 
michael@0: assertThrowsInstanceOf(function() { basic(obj); }, TypeError);
michael@0: 
michael@0: var arrs = obj.arrs;
michael@0: assertEq(arrs.length, N + 1);
michael@0: for (var i = 0; i < N; i++)
michael@0: {
michael@0:   assertEq(arrs[i].length, 5, "unexpected length for arrs[" + i + "]");
michael@0:   assertEq(arrs[i].hasOwnProperty(5), false,
michael@0:            "element not deleted for arrs[" + i + "]");
michael@0: }
michael@0: 
michael@0: var a = arrs[N];
michael@0: assertEq(a.hasOwnProperty(5), false);
michael@0: assertEq(a[5], undefined);
michael@0: assertEq(a.length, 6);